CN104598899A - Fingerprint imaging method and system - Google Patents
Fingerprint imaging method and system Download PDFInfo
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- CN104598899A CN104598899A CN201510086474.7A CN201510086474A CN104598899A CN 104598899 A CN104598899 A CN 104598899A CN 201510086474 A CN201510086474 A CN 201510086474A CN 104598899 A CN104598899 A CN 104598899A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
Disclosed is a fingerprint imaging method and system. The system comprises a backlight plate, an image sensor and a control processing module. The backlight plate is used for providing the emergent light lighting fingers; the image sensor is used for acquiring a finger image; the control processing module is used for acquiring a backlight finger image formed through the image sensor when the backlight plate is opened and judging whether the image sensor operates in a high light environment or not; when the image sensor operates in a weak light environment, the finger image is acquired according to the backlight finger image; when the image sensor operates in the high light environment, the backlight plate is controlled to close before the image sensor is controlled to acquire an environmental light finger image, and a fingerprint image is acquired according to the backlight finger image and the environmental light finger image. By recognizing the operation environment of the imaging system, the fingerprint image is acquired by different manners, the fingerprint image meeting the requirements can be acquired on different environmental light conditions, and the scalability and reliability of the system are improved.
Description
Technical field
The present invention relates to fingerprint recognition field, particularly a kind of fingerprint imaging method and fingerprint imaging system.
Background technology
Fingerprint imaging recognition technology is the fingerprint image being collected human body by fingerprint sensor, then compares with the existing fingerprint imaging information in system, whether carrys out correct judgment, and then realize the technology of identification.Due to the convenience that it uses, and the uniqueness of somatic fingerprint, fingerprint identification technology is widely used in every field.The such as field of safety check such as public security bureau, customs, the gate control system of building, and the consumer product area such as PC and mobile phone etc.
The implementation of fingerprint imaging technique has the multiple technologies such as optical imagery, capacitance imaging, ultrasonic imaging.Comparatively speaking, optical image technology, its imaging effect is relatively better, and equipment cost is relatively low.
With reference to figure 1, show the structural representation of existing a kind of fingerprint imaging system.
When gathering fingerprint image, human body finger 1 is positioned on cover glass 2; The emergent light 31 of backlight 3, through optical image sensor 4 and cover glass 2, occurs to reflect and transmission at the contact interface of human body finger 1 with cover glass 2; Reflected light 12, through cover glass 2, is irradiated on optical image sensor 4, carries out opto-electronic conversion and signal transacting, realize the collection of fingerprint image.Human body finger 1 reflects the fingerprint characteristic of human body with the surface of contact feature of cover glass 2, and the feature of this surface of contact directly can affect the feature of reflected light 12, and therefore, the image that optical image sensor 4 collects directly reflects the feature of somatic fingerprint.
But the imaging system of existing optical fingerprint identification equipment, can only gather fingerprint image, cannot gather satisfactory fingerprint image under strong surround lighting and sunshine, limit the function and application of fingerprint recognition system under suitable light conditions.
Summary of the invention
The problem that the present invention solves is to provide a kind of fingerprint imaging method and fingerprint imaging system, realizes can both gathering fingerprint image under normal circumstances with under strong ambient light conditions.
For solving the problem, the invention provides a kind of fingerprint imaging method, comprising:
Open backlight;
Backlight finger-image is obtained by imageing sensor;
Whether the working environment identifying described imageing sensor is strong light environment;
When described imageing sensor works under non-strong light environment, according to described backlight finger-image, obtain fingerprint image;
When described imageing sensor works under strong light environment, close backlight, obtain surround lighting finger-image; According to described backlight finger-image and surround lighting finger-image, obtain fingerprint image.
Optionally, after the step of described acquisition fingerprint image, described formation method also comprises the described fingerprint image of display.
Optionally, obtain the step of fingerprint image and comprise: according to the difference of described backlight finger-image and each pixel light intensity of surround lighting finger-image, obtain fingerprint image.
Optionally, after obtaining the step of backlight finger-image, before obtaining the step of fingerprint image, described fingerprint imaging method also comprises: make the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, and amplifies finger-image to obtain backlight; The step obtaining fingerprint image comprises: the difference of amplifying finger-image and each pixel light intensity of surround lighting finger-image according to backlight, obtains fingerprint image.
Optionally, when described imageing sensor works under strong light environment, before obtaining the step of fingerprint image, described fingerprint imaging method also comprises: whether the working environment identifying described imageing sensor is extremely strong luminous environment; When the working environment of described imageing sensor is extremely strong luminous environment, the light intensity of each pixel of described backlight finger-image is multiplied by and presets amplification coefficient, amplify finger-image to obtain backlight; Obtain in the step of fingerprint image, amplify finger-image and surround lighting finger-image according to backlight, obtain fingerprint image.
Optionally, whether the working environment of the described imageing sensor of described identification is that the step of strong light environment comprises: obtain environmental light intensity; Relatively whether environmental light intensity is greater than the high light threshold value preset; When environmental light intensity is greater than described high light threshold value, judge that the working environment of described imageing sensor is strong light environment.
Optionally, when the working environment judging described imageing sensor is strong light environment, judge whether described environmental light intensity is greater than the amplification threshold value preset further, described amplification threshold value is greater than described high light threshold value; When described environmental light intensity be more than or equal to amplify threshold value time, identify that the working environment of described imageing sensor is extremely strong luminous environment, and the light intensity of each pixel of described backlight finger-image be multiplied by preset amplification coefficient, amplify finger-image to obtain backlight; Obtain in the step of fingerprint image, amplify finger-image and surround lighting finger-image according to backlight, obtain fingerprint image.
Optionally, described amplification coefficient sets according to described backlight finger-image.
Optionally, after the step obtaining fingerprint image, also comprise and image enhaucament is carried out to described fingerprint image.
Accordingly, the present invention also provides a kind of fingerprint imaging system, comprises
Backlight, for providing the emergent light illuminating finger;
Imageing sensor, for obtaining finger-image;
Control treatment module, for obtaining the backlight finger-image that imageing sensor is formed when backlight is in open mode; Also for judging whether described imageing sensor works under strong light environment; When described imageing sensor works under non-strong light environment, obtain fingerprint image according to described backlight finger-image; When described imageing sensor works under strong light environment, control described backlight and close, after described backlight is closed, control described imageing sensor obtain surround lighting finger-image, and obtain fingerprint image according to backlight finger-image and surround lighting finger-image.
Optionally, described control treatment module comprises: recognition unit, for identifying whether the working environment of described imageing sensor is strong light environment; Control module, when the working environment that described recognition unit judges described imageing sensor is strong light environment, controls described backlight after imageing sensor obtains backlight finger-image, closes backlight; Also for after described backlight is closed, control described imageing sensor and obtain surround lighting finger-image; Processing unit, during for judging that at described recognition unit the working environment of described imageing sensor is non-strong light environment, receive the backlight finger-image that when backlight is in open mode, described imageing sensor obtains, according to described backlight finger-image, obtain fingerprint image; Time also for judging that at described recognition unit the working environment of described imageing sensor is strong light environment, receive backlight finger-image that when backlight is in open mode, described imageing sensor obtains and backlight close after the described surround lighting finger-image that obtains of imageing sensor, and according to described backlight finger-image and described surround lighting finger-image, obtain fingerprint image.
Optionally, described control module comprises: backlight controller, during for judging that at described recognition unit the working environment of described imageing sensor is strong light environment, controlling described backlight after imageing sensor obtains backlight finger-image, closing backlight; Image controller, during for judging that at described recognition unit the working environment of described imageing sensor is strong light environment, after backlight controller cutting out backlight, controlling described imageing sensor and obtaining surround lighting finger-image.
Optionally, described fingerprint imaging system also comprises ambient light detector, for acquisition environment light intensity; Described recognition unit comprises: high light comparer, for judging whether the environmental light intensity that ambient light detector obtains is less than the high light threshold value preset; Recognizer, when described high light comparer judges that described environmental light intensity is more than or equal to described high light threshold value, identifies that the working environment of described imageing sensor is strong light environment.
Optionally, described processing unit comprises: conventional processors, during for judging that at described recognition unit the working environment of described imageing sensor is non-strong light environment, the backlight finger-image that when being in open mode according to backlight, described imageing sensor obtains, obtains fingerprint image; High light processor, during for judging that at described recognition unit the working environment of described imageing sensor is strong light environment, the backlight finger-image that when being in open mode according to backlight, described imageing sensor obtains and backlight close after the described surround lighting finger-image that obtains of imageing sensor, obtain fingerprint image.
Optionally, described high light processor, according to the difference of backlight finger-image and each pixel light intensity of surround lighting finger-image, obtains fingerprint image.
Optionally, described high light processor also comprises multiplying arrangement, for making the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, amplifies finger-image to obtain backlight; Described high light processor, also for amplifying finger-image and described surround lighting finger-image according to described backlight, obtains fingerprint image.
Optionally, described recognition unit after judging that imageing sensor works under strong light environment, also for judging whether described imageing sensor works under extremely strong luminous environment; Described high light processor also comprises multiplying arrangement, during for judging that described imageing sensor works under extremely strong luminous environment at recognition unit, make the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, amplify finger-image to obtain backlight; Described high light processor, also for amplifying finger-image and described surround lighting finger-image according to described backlight, obtains fingerprint image.
Optionally, described fingerprint imaging system also comprises ambient light detector, for acquisition environment light intensity; Described recognition unit comprises: high light comparer, be preset with high light threshold value and amplify threshold value, described amplification threshold value is greater than described high light threshold value, for judging whether the environmental light intensity that ambient light detector obtains is greater than described high light threshold value, time also for being greater than described high light threshold value at the environmental light intensity judging that ambient light detector obtains, judge whether described environmental light intensity is greater than described amplification threshold value; Recognizer, when described high light comparer judges that described environmental light intensity is more than or equal to described high light threshold value, identify that the working environment of described imageing sensor is strong light environment, when judging that described environmental light intensity is more than or equal to described amplification threshold value, identify that the working environment of described imageing sensor is extremely strong luminous environment.
Optionally, described amplification coefficient sets according to described backlight finger-image.
Optionally, described processing unit also comprises rearmounted booster, for strengthening described fingerprint image.
Optionally, described fingerprint imaging system also comprises: display module, is connected with described control treatment module, for showing described fingerprint image.
Compared with prior art, technical scheme of the present invention has the following advantages:
The present invention, by identifying the working environment of described fingerprint imaging system, selects diverse ways to obtain fingerprint image: when described fingerprint imaging system works under non-strong light environment, directly obtains fingerprint image by backlight finger-image; When described fingerprint imaging system works under strong light environment, by controlling backlight and imageing sensor, again obtain surround lighting fingerprint image, by removing the surround lighting finger-image that surround lighting produces in backlight finger-image, thus achieve collect satisfactory fingerprint image under strong light environment, achieve and all can collect satisfactory fingerprint image in various varying environment light situation, improve extendability and the reliability of system.
Optionally, the present invention is also by ambient light detector direct detection environmental light intensity, and environmentally light intensity identifies the working environment of fingerprint imaging system automatically, automatic selection obtains the method for fingerprint image, and according to backlight finger-image information, automatic setting amplification coefficient, amplifies backlight finger-image, the convenience that the system that improves uses and intelligent.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of fingerprint imaging system in prior art;
Fig. 2 is the structural representation of fingerprint imaging system one embodiment provided by the present invention;
Fig. 3 is the functional block diagram of control treatment module 60 in fingerprint imaging system shown in Fig. 2;
Fig. 4 is the backlight finger-image that fingerprint imaging system shown in Fig. 2 gathers under non-strong light environment;
Fig. 5 is the backlight finger-image that fingerprint imaging system shown in Fig. 2 gathers under strong light environment;
Fig. 6 is the fingerprint image that fingerprint imaging system shown in Fig. 2 obtains;
Fig. 7 is the process flow diagram of fingerprint imaging method one embodiment provided by the present invention;
Fig. 8 is that in Fig. 7, step S200 identifies that whether the working environment of described imaging system is the process flow diagram of strong light environment.
Embodiment
Can be known by background technology, existing fingerprint imaging system existence cannot obtain the problem of the fingerprint image under strong ambient light conditions, now in conjunction with fingerprint image image-forming principle, problem analysis reason: as described in Figure 1, existing fingerprint imaging system at the surface of contact of cover glass 2 and irradiated human body finger 1, reflection and transmission occurs by incident light 31, and the light that reflection occurs forms reflected light 12 and turns back to optical image sensor 4; The light that transmission occurs then cannot be received by optical image sensor 4; thus just define at the imaging surface of optical image sensor 4 image only formed by reflected light 12; described image is consistent with the surface of contact of cover glass 2 and irradiated human body finger 1; the characteristic reaction of the described surface of contact fingerprint characteristic of human body, thus optical image sensor 4 achieves the collection of fingerprint image.
When surround lighting is very strong time, the light signal that described optical image sensor 4 accepts is except including reflected light 12, also include a large amount of surround lightings, thus proportion shared in the light signal making the reflected light 12 of reflection somatic fingerprint feature receive at described optical image sensor 4 is very little, so optical image sensor 4 obtain the light signal of image mainly surround lighting, therefore the fingerprint imaging system of prior art cannot obtain fingerprint image under strong ambient light conditions.
For solveing the technical problem, the invention provides a kind of fingerprint imaging system, comprising:
Backlight, for providing the emergent light illuminating finger; Imageing sensor, for obtaining finger-image; Control treatment module, for obtaining the backlight finger-image that imageing sensor is formed when backlight is in open mode; Also for judging whether described imageing sensor works under strong light environment; When described imageing sensor works under non-strong light environment, obtain fingerprint image according to described backlight finger-image; When described imageing sensor works under strong light environment, control described backlight and close, after described backlight is closed, control described imageing sensor obtain surround lighting finger-image, and obtain fingerprint image according to backlight finger-image and surround lighting finger-image.
The present invention, by identifying the working environment of described fingerprint imaging system, selects diverse ways to obtain fingerprint image: when described fingerprint imaging system works under non-strong light environment, directly obtains fingerprint image by backlight finger-image; When described fingerprint imaging system works under strong light environment, by controlling backlight and imageing sensor, again obtain surround lighting fingerprint image, by removing the surround lighting finger-image that surround lighting produces in backlight finger-image, thus achieve collect satisfactory fingerprint image under strong light environment, achieve and all can collect satisfactory fingerprint image in various varying environment light situation.In addition, the present invention adopts ambient light detector direct detection environmental light intensity, and environmentally light intensity identifies the working environment of fingerprint imaging system automatically, automatic selection obtains the method for fingerprint image, and environmentally light intensity and backlight finger-image, automatic setting amplification coefficient, amplifies backlight finger-image.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail specific embodiments of the invention below in conjunction with accompanying drawing.
With reference to figure 2, show the schematic diagram of fingerprint imaging system one embodiment provided by the present invention.
Described fingerprint imaging system comprises:
Backlight 11, for providing backlight, described backlight forms the emergent light 14 illuminating finger.
It should be noted that, in the present embodiment, described fingerprint imaging system also comprises protection panel 50 for isolating finger 40 and fingerprint imaging system, to protect fingerprint imaging system.
Emergent light 14 is irradiated to finger 40 and the surface of contact of protection panel 50 after described backlight 11 sends, and reflection and transmission occur.Emergent light 14 is irradiated to after reflection occurs finger 40 and forms reflected light 41, and described reflected light 41 includes finger print information.
Imageing sensor 21, for obtaining finger-image.
Concrete, described imageing sensor 21, for after backlight 11 is opened, obtains backlight finger-image.In the present embodiment, described imageing sensor 21 is optical surface array image sensor, but adopts the way of optical surface array image sensor to be only an example, and the present invention does not limit this.
It should be noted that, the backlight finger-image that described imageing sensor 21 obtains after opening backlight 11 is formed jointly by surround lighting and reflected light 41.When environmental light intensity is suitable, described backlight finger-image (with reference to figure 4) is mainly formed by reflected light 41, and the proportion of surround lighting shared by backlight finger-image is less, directly can obtain fingerprint image from backlight finger-image; When environmental light intensity is excessive, namely when described fingerprint imaging system works under strong light environment, described backlight finger-image (with reference to figure 5) is mainly made up of surround lighting, the proportion that the reflected light 41 including finger print information accounts in described backlight finger-image is less, cannot obtain fingerprint image from backlight finger-image.
Control treatment module 60, for obtaining the backlight finger-image that imageing sensor 21 is formed when backlight 11 is in open mode; Also for judging whether described imageing sensor 21 works under strong light environment; When described imageing sensor 21 works in non-high light situation, obtain fingerprint image according to described backlight finger-image; When described imageing sensor 21 works under strong light environment, control described backlight 11 to close, after described backlight 11 is closed, control described imageing sensor 21 obtain surround lighting finger-image, and obtain fingerprint image according to backlight finger-image and surround lighting finger-image.
In conjunction with reference to figure 3, show the functional block diagram of control treatment module 60 in Fig. 2.
Concrete, described control treatment module 60 comprises:
Recognition unit 620, for identifying whether the working environment of described imageing sensor 21 is strong light environment.
It should be noted that, in the present embodiment, described fingerprint imaging system also comprises ambient light detector 610, and for acquisition environment light intensity, described environmental light intensity is in order to identify whether the working environment of described imageing sensor 21 is strong light environment.In the present embodiment, an ambient light detector 610 is independently set above imageing sensor 21, in order to acquisition environment light intensity.
Also it should be noted that, the setting that detector is positioned at the top of imageing sensor with the way of acquisition environment light intensity and ambient light detector 610 is independently set and is only an example, in other embodiments of the present invention, also imageing sensor 21 can be used to realize the detection of environmental light intensity, in addition when independently arranging ambient light detector 610, described ambient light detector 610 can also be arranged on other positions of fingerprint imaging system, and the present invention is not restricted this.
Described recognition unit 620 comprises high light comparer 621.High light threshold value is previously provided with in described high light comparer 621.Described high light comparer 621 is connected with described ambient light detector 610, for judging the relative size of the environmental light intensity that ambient light detector 610 obtains and described high light threshold value.
Described recognition unit 620 also comprises recognizer 622, for the judged result according to described high light comparer 621, identifies whether the working environment of described imageing sensor 21 is strong light environment.
Concrete, described recognizer 622 is connected with described high light comparer 621, receive the judged result of described high light comparer 621, whether the working environment of described recognizer 622 imageing sensor 21 according to the judged result identification of described high light comparer 621 is strong light environment: when described high light comparer 621 judges that described environmental light intensity is more than or equal to described high light threshold value, and described recognizer 622 identifies that the working environment of described imageing sensor 21 is strong light environment.
It should be noted that, whether environment residing for fingerprint imaging system is that the way of strong light environment is only an example to adopt detector, comparer and recognizer automatically to identify in the present embodiment.In other embodiments of the invention, can also adopt artificial setting, directly select the environment residing for described fingerprint imaging system, the present invention does not limit this.
Continue with reference to figure 3, described control treatment module 60 also comprises control module 630, during for identifying that described imageing sensor 21 works under strong light environment at recognition unit 620, after imageing sensor 21 obtains backlight finger-image, closes backlight 11; Also for after described backlight 11 is closed, control described imageing sensor 21 and obtain surround lighting finger-image.
Described control module 630 comprises backlight controller 631, and described backlight controller 631, according to the recognition result of described recognition unit 620, controls described backlight 11.
Concrete, described backlight controller 631 is connected with described recognizer 622, receives the recognition result of described recognizer 622; Also be connected with described backlight 11, described backlight controller 631 controls backlight 11 according to described recognition result: when the working environment that described recognizer 622 identifies described imageing sensor 21 is strong light environment, after imageing sensor 21 obtains backlight finger-image, described backlight controller 631 closes backlight 11.
Described control module 630 also comprises image controller 632, according to the recognition result of described recognizer 622, controls described imageing sensor 21.
Concrete, described image controller 632 is connected with described recognizer 622, receives the recognition result of described recognizer 622; Also be connected with described imageing sensor 21, described image controller 632 is according to described recognition result control chart image-position sensor 21: when the working environment that described recognizer 622 identifies described imageing sensor 21 is strong light environment, after described backlight 11 is closed by backlight controller 631, described image controller 632 controls described imageing sensor 21 and obtains surround lighting finger-image.
It should be noted that, when imageing sensor 21 works under strong light environment, the reason that cannot obtain fingerprint image from backlight finger-image is that surround lighting proportion in described backlight finger-image is excessive, and the reflected light proportion in described backlight finger-image therefore comprising finger print information is less.And described surround lighting finger-image, then only formed by surround lighting.
Continue with reference to figure 3, described control treatment module 60 also comprises processing unit 640, for when the working environment that described recognition unit 620 judges described imageing sensor 21 is non-strong light environment, receive the backlight finger-image that when backlight 11 is in open mode, described imageing sensor 21 obtains, according to described backlight finger-image, obtain fingerprint image; Also for when the working environment that described recognition unit 620 judges described imageing sensor 21 is strong light environment, receive backlight finger-image that when backlight 11 is in open mode, described imageing sensor 21 obtains and backlight 11 and close the described surround lighting finger-image that rear imageing sensor 21 obtains, and according to described backlight finger-image and described surround lighting finger-image, obtain fingerprint image.
Concrete, described processing unit 640 comprises conventional processors 641, for when the working environment that described recognition unit 620 judges described imageing sensor 21 is non-strong light environment, the backlight finger-image that when being in open mode according to backlight 11, described imageing sensor 21 obtains, obtains fingerprint image.
Concrete, described conventional processors 641 is connected with described recognizer 622, receives the recognition result of described recognizer 622 to described imageing sensor 21 working environment; Also be connected with described imageing sensor 21, for when the working environment that described recognizer 622 identifies described imageing sensor 21 is non-strong light environment, receive the backlight finger-image that described imageing sensor 21 obtains when backlight 11 is in open mode.Described conventional processors 641 also for according to described backlight finger-image, obtains fingerprint image.
Described processing unit 640 also comprises high light processor 642, for when the working environment that described recognition unit 620 judges described imageing sensor 21 is strong light environment, the backlight finger-image that when being in open mode according to backlight 11, described imageing sensor 21 obtains and backlight 11 close the described surround lighting finger-image that rear imageing sensor 21 obtains, and obtain fingerprint image.
Concrete, described high light processor 642 is connected with described recognizer 622, receives the recognition result of described recognizer 622 to described imageing sensor 21 working environment; Also be connected with described imageing sensor 21, for when the working environment that described recognizer 622 identifies described imageing sensor 21 is non-strong light environment, receive the surround lighting finger-image obtained after backlight finger-image that described imageing sensor 21 obtains when backlight 11 is in open mode and backlight 11 are closed.Described high light processor 642 also for according to described backlight finger-image and described surround lighting finger-image, obtains fingerprint image (with reference to figure 6).
It should be noted that, described high light processor 642, according to the difference of described backlight finger-image and each pixel light intensity of described surround lighting finger-image, obtains fingerprint image.Described backlight finger-image is formed by surround lighting and reflected light 41, wherein only has in reflected light 41 and includes finger print information, if therefore remove most surround lighting from backlight finger-image, and the just mainly reflected light stayed.Therefore from backlight finger-image, remove the fingerprint image of image with regard to mainly being formed by reflected light that surround lighting finger-image is formed.
Also it should be noted that, in the present embodiment, high light processor 642 also comprises multiplying arrangement 6421, for making the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, amplifies finger-image to obtain backlight.Afterwards, described high light processor 642 is also for amplifying finger-image and described surround lighting finger-image acquisition fingerprint image according to described backlight.
In addition it should be noted that, described amplification coefficient sets according to described backlight finger-image.Concrete, in the present embodiment, amplification coefficient sets according to the average intensity values of described backlight finger-image.But amplification coefficient also can set according to the light distribution of shown backlight finger-image, also can by artificial setting, the present invention does not limit this.
It should be noted that further, described recognition unit 620 is also for identifying whether described imageing sensor 21 works under extremely strong luminous environment.Concrete, in the present embodiment, be also previously provided with amplification threshold value in described high light comparer 621, described amplification threshold value is greater than described high light threshold value.Described high light comparer 621 is also for judging the relative size of the environmental light intensity that described ambient light detector 610 obtains and described amplification threshold value.When described recognizer 622 is also for judging that at described high light comparer 621 described environmental light intensity is more than or equal to amplification threshold value, identify that the working environment of described imageing sensor 21 is extremely strong luminous environment.
When the working environment that described recognition unit 620 judges described imageing sensor 21 is extremely strong luminous environment, multiplying arrangement 6421 in described high light processor 642, make the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, amplify finger-image to obtain backlight.Afterwards, described high light processor 642 is also for amplifying finger-image and described surround lighting finger-image acquisition fingerprint image according to shown backlight.
Concrete, in the present embodiment, in order to improve accuracy of identification, described processing unit 640 can also comprise rearmounted booster 643, for strengthening described fingerprint image.
Described rearmounted booster 643 is connected with described high light processor 642 with described conventional processors 641, receive the fingerprint image of described conventional processors 641 or the acquisition of described high light processor 642, by improving the contrast of described fingerprint image, improve the acutance of described fingerprint image, realize the enhancing of described fingerprint image, to improve the accuracy of identification of described fingerprint recognition system.
Continue with reference to figure 2, described fingerprint imaging system also comprises display module 70, is connected with described control treatment module 60, for showing described fingerprint image.
To sum up, the present invention, by identifying the working environment of described fingerprint imaging system, selects diverse ways to obtain fingerprint image: when described fingerprint imaging system works under non-strong light environment, directly obtains fingerprint image by backlight finger-image; When described fingerprint imaging system works under strong light environment, by controlling backlight and imageing sensor, again obtain surround lighting fingerprint image, by removing the surround lighting finger-image that surround lighting produces in backlight finger-image, thus achieve collect satisfactory fingerprint image under strong environment light condition, achieve and all can collect satisfactory fingerprint image in various varying environment light situation.In addition, the present invention is also by ambient light detector direct detection environmental light intensity, and environmentally light intensity identifies the working environment of fingerprint imaging system automatically, automatic selection obtains the method for fingerprint image, and according to backlight finger-image information, automatically set amplification coefficient, amplify backlight finger-image.
Accordingly, the present invention also provides a kind of fingerprint imaging method, comprising:
Open backlight; Backlight finger-image is obtained by imageing sensor; Whether the working environment identifying described imageing sensor is strong light environment; When described imageing sensor works under non-strong light environment, according to described backlight finger-image, obtain fingerprint image; When described imageing sensor works under strong light environment, close backlight, obtain surround lighting finger-image; According to described backlight finger-image and surround lighting finger-image, obtain fingerprint image.
With reference to figure 7, show the process flow diagram of fingerprint imaging method one embodiment provided by the present invention.
First perform step S100, open backlight, obtain backlight finger-image by imageing sensor.
It should be noted that, in the present embodiment, what described fingerprint imaging method obtained is finger and the finger-image protecting panel surface of contact.
Described backlight forms emergent light, is irradiated to the surface of contact of finger and protection panel, reflection and transmission occur.Described reflected light includes finger print information.
After obtaining backlight finger-image, perform step S200, identify whether the working environment of described imageing sensor is strong light environment.
Identify that whether the working environment of described imageing sensor is the process flow diagram of strong light environment in conjunction with showing step S200 in Fig. 7 with reference to figure 8, Fig. 8.
First perform step S201 and obtain environmental light intensity.In the present embodiment, obtain environmental light intensity by ambient light detector.
Secondly perform step S202, judge described environmental light intensity and the relative size of the high light threshold value pre-set, when described environmental light intensity is more than or equal to described high light threshold value, performs step S203, identify that described finger imageing sensor is in strong light environment; Otherwise perform step S204, identify that described imageing sensor is in non-strong light environment.
It should be noted that, directly obtain environmental light intensity in the present embodiment by separate detectors, fingerprint imaging system identifies that the way of working environment is only an example automatically.In other embodiments of the invention, can also adopt artificial setting, directly select the environment residing for described imageing sensor, the present invention is not restricted this.
Continue with reference to figure 7, when the working environment judging described imageing sensor is non-strong light environment, namely described imageing sensor works under suitable light conditions, then perform step S311, obtains fingerprint image according to described backlight finger-image.
It should be noted that, the backlight finger-image (with reference to figure 4) obtained after opening backlight is formed jointly by surround lighting and reflected light.When environmental light intensity is suitable, described backlight finger-image is mainly formed by reflected light, and the proportion of surround lighting shared by backlight finger-image is less, directly can obtain fingerprint image from backlight finger-image.
When the working environment judging described imageing sensor is strong light environment, perform step S321, close backlight, obtain surround lighting finger-image.
When imageing sensor works under strong light environment, the reason that cannot obtain fingerprint image from backlight finger-image is that surround lighting proportion in described backlight finger-image is excessive, and the reflected light proportion in described backlight finger-image therefore comprising finger print information is less.And described surround lighting finger-image, then only formed by surround lighting.
Afterwards, perform step S322, according to described backlight finger-image and surround lighting finger-image, obtain fingerprint image.
Described backlight finger-image is formed by surround lighting and reflected light, wherein only has in reflected light and include finger print information, if therefore remove most surround lighting from backlight finger-image, and the just mainly reflected light stayed.Therefore the fingerprint image of image with regard to mainly being formed by reflected light that surround lighting finger-image is formed is removed in backlight finger-image.
Concrete, the step obtaining fingerprint image according to described backlight finger-image and surround lighting finger-image comprises, according to the difference of each pixel light intensity of fingerprint image that the image removing the formation of surround lighting finger-image in backlight finger-image is just mainly formed by reflected light, obtain fingerprint image.
It should be noted that, in the present embodiment, at execution step S100, after obtaining the step of backlight finger-image, perform step S322, before obtaining the step without surround lighting finger-image according to described backlight finger-image and surround lighting finger-image, described formation method also comprises makes the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, and amplifies finger-image to obtain backlight.Afterwards, in the step S322 obtaining fingerprint image, also comprise: the difference of amplifying finger-image and each pixel of surround lighting finger-image according to backlight, obtain fingerprint image.
Also it should be noted that, perform step S200, when identifying that described imageing sensor works under strong light environment, perform step S322, before obtaining the step of fingerprint image, described fingerprint imaging method also comprises whether the working environment identifying described imageing sensor is extremely strong luminous environment; When the working environment of described imageing sensor is extremely strong luminous environment, make the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, amplify finger-image to obtain backlight; Obtain in the step of fingerprint image, amplify finger-image and surround lighting finger-image according to backlight, obtain fingerprint image.
Concrete, in the present embodiment, by judging whether described environmental light intensity is greater than the amplification threshold value preset, described amplification threshold value is greater than described high light threshold value: when the working environment judging described imageing sensor is strong light environment, judge whether described environmental light intensity is greater than the amplification threshold value preset further, when whether described environmental light intensity is more than or equal to the amplification threshold value preset, identify that the working environment of described imageing sensor is extremely strong luminous environment, and the light intensity of each pixel of described backlight finger-image is multiplied by preset amplification coefficient, finger-image is amplified to obtain backlight.Afterwards, then perform step S322, obtain in the step of fingerprint image, amplify finger-image and surround lighting finger-image according to backlight, obtain fingerprint image.
It should be noted that, in the present embodiment, described amplification coefficient sets according to described backlight finger-image.Concrete, in the present embodiment, amplification coefficient sets according to the average intensity values of described backlight finger-image.But amplification coefficient also can set according to the light distribution of shown backlight finger-image, also can by artificial setting, the method for the present invention to setting amplification coefficient does not limit.
Also it should be noted that, in order to improve the accuracy of fingerprint recognition, in the present embodiment, in execution step 311 or execution step 322, after obtaining the step of fingerprint image, described fingerprint imaging method also comprises execution step S400, strengthens described fingerprint image.
Concrete, by improving picture contrast in the present embodiment, realizing strengthening described fingerprint image, to optimize obtained fingerprint image, improving the accuracy of fingerprint recognition.But adopt the method improving contrast to realize being only an example to the way of the enhancing of fingerprint image, the present invention does not limit this.
Further, at execution step S400, after strengthening fingerprint image, in the present embodiment, described fingerprint imaging method also comprises execution step S500, shows described fingerprint image.
To sum up, the present invention is by identifying the working environment of described imageing sensor, distinct methods is selected to obtain fingerprint image, achieve and collect satisfactory fingerprint image under strong environment light condition, achieve and all can collect satisfactory fingerprint image under various different luminous environment, improve extendability and the reliability of system.
In fingerprint recognition system provided by the present invention, unit and each device can pass through field programmable gate array (Field-Programmable Gate Array, FPGA) realize, when describing above-described embodiment, each FPGA device is illustrated, but the present invention does not limit this, can also be that other can realize the hardware implementing of identical function.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (21)
1. a fingerprint imaging method, is characterized in that, comprising:
Open backlight;
Backlight finger-image is obtained by imageing sensor;
Whether the working environment identifying described imageing sensor is strong light environment;
When described imageing sensor works under non-strong light environment, according to described backlight finger-image, obtain fingerprint image;
When described imageing sensor works under strong light environment, close backlight, obtain surround lighting finger-image; According to described backlight finger-image and surround lighting finger-image, obtain fingerprint image.
2. fingerprint imaging method as claimed in claim 1, is characterized in that, after obtaining the step of fingerprint image, described formation method also comprises the described fingerprint image of display.
3. fingerprint imaging method as claimed in claim 1, is characterized in that, the step obtaining fingerprint image comprises: according to the difference of described backlight finger-image and each pixel light intensity of surround lighting finger-image, obtain fingerprint image.
4. fingerprint imaging method as claimed in claim 1, it is characterized in that, after obtaining the step of backlight finger-image, before obtaining the step of fingerprint image, described fingerprint imaging method also comprises: make the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, and amplifies finger-image to obtain backlight;
The step obtaining fingerprint image comprises: the difference of amplifying finger-image and each pixel light intensity of surround lighting finger-image according to backlight, obtains fingerprint image.
5. fingerprint imaging method as claimed in claim 1, it is characterized in that, when described imageing sensor works under strong light environment, before obtaining the step of fingerprint image, described fingerprint imaging method also comprises: whether the working environment identifying described imageing sensor is extremely strong luminous environment;
When the working environment of described imageing sensor is extremely strong luminous environment, the light intensity of each pixel of described backlight finger-image is multiplied by and presets amplification coefficient, amplify finger-image to obtain backlight;
Obtain in the step of fingerprint image, amplify finger-image and surround lighting finger-image according to backlight, obtain fingerprint image.
6. fingerprint imaging method as claimed in claim 1, is characterized in that, whether the working environment of the described imageing sensor of described identification is that the step of strong light environment comprises:
Obtain environmental light intensity;
Relatively whether environmental light intensity is greater than the high light threshold value preset;
When environmental light intensity is greater than described high light threshold value, judge that the working environment of described imageing sensor is strong light environment.
7. fingerprint imaging method as claimed in claim 6, it is characterized in that, when the working environment judging described imageing sensor is strong light environment, judge whether described environmental light intensity is greater than the amplification threshold value preset further, described amplification threshold value is greater than described high light threshold value;
When described environmental light intensity be more than or equal to amplify threshold value time, identify that the working environment of described imageing sensor is extremely strong luminous environment, and the light intensity of each pixel of described backlight finger-image be multiplied by preset amplification coefficient, amplify finger-image to obtain backlight;
Obtain in the step of fingerprint image, amplify finger-image and surround lighting finger-image according to backlight, obtain fingerprint image.
8. the fingerprint imaging method as described in claim 4,5 or 7, is characterized in that, described amplification coefficient sets according to described backlight finger-image.
9. fingerprint imaging method as claimed in claim 1, is characterized in that, after the step obtaining fingerprint image, also comprises and carries out image enhaucament to described fingerprint image.
10. a fingerprint imaging system, is characterized in that, comprising:
Backlight, for providing the emergent light illuminating finger;
Imageing sensor, for obtaining finger-image;
Control treatment module, for obtaining the backlight finger-image that imageing sensor is formed when backlight is in open mode; Also for judging whether described imageing sensor works under strong light environment; When described imageing sensor works under non-strong light environment, obtain fingerprint image according to described backlight finger-image; When described imageing sensor works under strong light environment, control described backlight and close, after described backlight is closed, control described imageing sensor obtain surround lighting finger-image, and obtain fingerprint image according to backlight finger-image and surround lighting finger-image.
11. fingerprint imaging systems as claimed in claim 10, it is characterized in that, described control treatment module comprises:
Recognition unit, for identifying whether the working environment of described imageing sensor is strong light environment;
Control module, when the working environment that described recognition unit judges described imageing sensor is strong light environment, controls described backlight after imageing sensor obtains backlight finger-image, closes backlight; Also for after described backlight is closed, control described imageing sensor and obtain surround lighting finger-image;
Processing unit, during for judging that at described recognition unit the working environment of described imageing sensor is non-strong light environment, receive the backlight finger-image that when backlight is in open mode, described imageing sensor obtains, according to described backlight finger-image, obtain fingerprint image; Time also for judging that at described recognition unit the working environment of described imageing sensor is strong light environment, receive backlight finger-image that when backlight is in open mode, described imageing sensor obtains and backlight close after the described surround lighting finger-image that obtains of imageing sensor, and according to described backlight finger-image and described surround lighting finger-image, obtain fingerprint image.
12. fingerprint imaging systems as claimed in claim 11, it is characterized in that, described control module comprises:
Backlight controller, during for judging that at described recognition unit the working environment of described imageing sensor is strong light environment, controlling described backlight after imageing sensor obtains backlight finger-image, closing backlight;
Image controller, during for judging that at described recognition unit the working environment of described imageing sensor is strong light environment, after backlight controller cutting out backlight, controlling described imageing sensor and obtaining surround lighting finger-image.
13. fingerprint imaging systems as claimed in claim 11, it is characterized in that, described fingerprint imaging system also comprises ambient light detector, for acquisition environment light intensity;
Described recognition unit comprises: high light comparer, for judging whether the environmental light intensity that ambient light detector obtains is less than the high light threshold value preset; Recognizer, when described high light comparer judges that described environmental light intensity is more than or equal to described high light threshold value, identifies that the working environment of described imageing sensor is strong light environment.
14. fingerprint imaging systems as claimed in claim 11, it is characterized in that, described processing unit comprises:
Conventional processors, during for judging that at described recognition unit the working environment of described imageing sensor is non-strong light environment, the backlight finger-image that when being in open mode according to backlight, described imageing sensor obtains, obtains fingerprint image;
High light processor, during for judging that at described recognition unit the working environment of described imageing sensor is strong light environment, the backlight finger-image that when being in open mode according to backlight, described imageing sensor obtains and backlight close after the described surround lighting finger-image that obtains of imageing sensor, obtain fingerprint image.
15. fingerprint imaging systems as claimed in claim 14, is characterized in that, described high light processor, according to the difference of backlight finger-image and each pixel light intensity of surround lighting finger-image, obtains fingerprint image.
16. fingerprint imaging systems as claimed in claim 14, it is characterized in that, described high light processor also comprises multiplying arrangement, for making the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, amplifies finger-image to obtain backlight;
Described high light processor, also for amplifying finger-image and described surround lighting finger-image according to described backlight, obtains fingerprint image.
17. fingerprint imaging systems as claimed in claim 14, is characterized in that, described recognition unit after judging that imageing sensor works under strong light environment, also for judging whether described imageing sensor works under extremely strong luminous environment;
Described high light processor also comprises multiplying arrangement, during for judging that described imageing sensor works under extremely strong luminous environment at recognition unit, make the light intensity of each pixel of described backlight finger-image be multiplied by the amplification coefficient preset, amplify finger-image to obtain backlight;
Described high light processor, also for amplifying finger-image and described surround lighting finger-image according to described backlight, obtains fingerprint image.
18. fingerprint imaging systems as claimed in claim 17, it is characterized in that, described fingerprint imaging system also comprises ambient light detector, for acquisition environment light intensity;
Described recognition unit comprises: high light comparer, be preset with high light threshold value and amplify threshold value, described amplification threshold value is greater than described high light threshold value, for judging whether the environmental light intensity that ambient light detector obtains is greater than described high light threshold value, time also for being greater than described high light threshold value at the environmental light intensity judging that ambient light detector obtains, judge whether described environmental light intensity is greater than described amplification threshold value;
Recognizer, when described high light comparer judges that described environmental light intensity is more than or equal to described high light threshold value, identify that the working environment of described imageing sensor is strong light environment, when judging that described environmental light intensity is more than or equal to described amplification threshold value, identify that the working environment of described imageing sensor is extremely strong luminous environment.
19. fingerprint imaging systems as described in claim 16 or 17, it is characterized in that, described amplification coefficient sets according to described backlight finger-image.
20. fingerprint imaging systems as claimed in claim 11, it is characterized in that, described processing unit also comprises rearmounted booster, for strengthening described fingerprint image.
21. fingerprint imaging systems as claimed in claim 10, it is characterized in that, described fingerprint imaging system also comprises: display module, is connected with described control treatment module, for showing described fingerprint image.
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