CN117929391A - Programmable phase shift control illumination method and light source - Google Patents
Programmable phase shift control illumination method and light source Download PDFInfo
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- CN117929391A CN117929391A CN202410227150.XA CN202410227150A CN117929391A CN 117929391 A CN117929391 A CN 117929391A CN 202410227150 A CN202410227150 A CN 202410227150A CN 117929391 A CN117929391 A CN 117929391A
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- 238000005286 illumination Methods 0.000 title claims abstract description 91
- 230000010363 phase shift Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000003491 array Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 15
- 238000007373 indentation Methods 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8845—Multiple wavelengths of illumination or detection
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Abstract
The invention discloses a programmable phase shift control illumination method and a light source, wherein the programmable phase shift control illumination method comprises the following steps: acquiring a target illumination template, wherein the target illumination template comprises an illumination angle; disassembling the target illumination template into display data, the display data comprising a plurality of row display data and a plurality of column display data, the display data comprising angle data; and controlling the LED array to display based on the display data. The invention can display and irradiate based on different target illumination templates, is favorable for highlighting the slowly-changing defect characteristics such as smooth indentation and the like, and further improves the accuracy of defect detection.
Description
Technical Field
The present invention relates to the field of optical illumination technology, and in particular, to a programmable phase shift control illumination method and a light source.
Background
In the field of machine vision detection, the illumination light source is used for illuminating the features, so that the gray value difference between the features and the background is maximized, and the imaging is more stable. Product defect detection is an important link in the manufacturing industry, and can effectively improve product quality and production efficiency, so that the illumination light source is required to have higher uniformity and higher stability. However, in some special cases, such as slow changing features like smooth indentations, conventional defect detection methods may not accurately detect defects, resulting in product quality problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a programmable phase shift control illumination method and a light source, which solve the problem that the defect detection method in the prior art can not accurately detect defects, so that the quality of products is poor.
In order to achieve the above object, the present invention provides the following technical solutions:
A programmable phase shift controlled illumination method comprising:
Acquiring a target illumination template, wherein the target illumination template comprises an illumination angle;
disassembling the target illumination template into display data, the display data comprising a plurality of row display data and a plurality of column display data, the display data comprising angle data;
And controlling the LED array to display based on the display data.
Optionally, each of the row display data and the column display data includes:
The on-off parameters and the light intensity parameters of the individual light sources in each row and each column.
Optionally, the display data further comprises a switching speed of adjacent rows and adjacent columns.
Optionally, the acquiring the target illumination template includes:
Determining a current detection scene;
and acquiring a corresponding target illumination template according to the current detection scene.
Optionally, the target lighting template includes:
The illumination pattern is formed by combining a plurality of bright spots, and the light intensity of each bright spot is the same or different.
Optionally, the controlling the LED array to display based on the display data includes:
adjusting the placement angle of the LED array based on the angle data;
and controlling the LED array to be positioned at the target placement angle for display.
Optionally, the programmable phase shift controlled illumination method further includes:
acquiring the current state of a target detection object;
and executing an operation corresponding to the current state of the target detection object according to a preset template, wherein the operation comprises continuing display or stopping display.
The invention also comprises a programmable phase shift controlled illumination source for implementing a programmable phase shift controlled illumination method as described in any one of the preceding claims, comprising:
An acquisition unit configured to acquire a target illumination template;
The processing unit is used for disassembling the target illumination template into display data, wherein the display data comprises a plurality of row display data and a plurality of column display data;
And the display control unit is used for controlling the LED array to display based on the display data.
Optionally, each of the row display data and the column display data includes:
the on-off parameters and the light intensity parameters of the individual light sources in each row and each column;
The display control unit comprises a main control FPGA chip and a CPLD expansion chip, and the main control FPGA chip and the CPLD expansion chip are used for controlling the LED arrays of each row and each column to display based on the on-off parameters and the light intensity parameters of the single light source in each row and each column in a cascading control mode.
Optionally, the display data further includes a switching speed of adjacent rows and adjacent columns, and an illumination angle;
the display control unit comprises an angle adjustment subunit;
the display control unit is used for switching display of the adjacent rows and the adjacent columns according to the switching speed of the adjacent rows and the adjacent columns;
the angle adjustment subunit comprises an angle sensor and a driver, wherein the angle sensor is used for sensing the placement angle of the LED array, and the driver is used for driving and adjusting the LED array to the target placement angle based on the irradiation angle.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a programmable phase shift control illumination method and a light source, which can display and irradiate based on different target illumination templates, are favorable for highlighting slowly-changing defect characteristics such as smooth indentation and the like, and further improve the accuracy of defect detection.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of a programmable phase shift controlled illumination method provided by the present invention;
FIG. 2 is a flowchart of step S1 in a programmable phase shift controlled illumination method according to the present invention;
FIG. 3 is a flowchart of step S3 in a programmable phase shift controlled illumination method according to the present invention;
FIG. 4 is a flow chart of a programmable phase shift controlled illumination method according to the present invention;
FIG. 5 is a block diagram of a programmable phase shift controlled illumination source according to the present invention;
FIG. 6 is a schematic diagram of a programmable phase shift controlled illumination source according to the present invention;
fig. 7 is a control flow chart of a programmable phase shift controlled illumination source according to the present invention.
In the above figures: 10. an acquisition unit; 20. a processing unit; 30. and a display control unit.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it will be understood that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Furthermore, the terms "long," "short," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description of the present invention, and are not intended to indicate or imply that the apparatus or elements referred to must have this particular orientation, operate in a particular orientation configuration, and thus should not be construed as limiting the invention.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, a programmable phase shift controlled illumination method includes:
S1, acquiring a target illumination template;
S2, disassembling the target illumination template into display data, wherein the display data comprises a plurality of row display data and a plurality of column display data;
and S3, controlling the LED array to display based on the display data.
Wherein, the target illumination template includes:
the illumination pattern is formed by combining a plurality of bright spots, and the light intensity of each bright spot is the same or different.
In this embodiment, after the target illumination template is disassembled into a plurality of row display data and a plurality of column display data, the display data of each row and each column respectively includes: the on-off parameters and the light intensity parameters of the individual light sources in each row and each column.
It will be appreciated that, for example, in a single row of display data, each light source is lit separately from one end to the other end at intervals, so that the row forms an illumination pattern of discrete bright spots, the single column of data is the same, and the combination of multiple rows and columns of data can form a specific illumination pattern to realize defect detection of different detection scenes.
Referring to fig. 2, it can be understood that, in this embodiment, the obtaining the target illumination template includes:
s11, determining a current detection scene;
S12, acquiring a corresponding target illumination template according to the current detection scene.
For example, for a detection scene with a concave-convex surface of a target detection object, selecting a target illumination template with a linear illumination pattern so as to be beneficial to the highlighting of the concave-convex surface; for the slowly varying features with smooth indentations, etc., each row and each column of the LED array is made to exhibit balanced illumination and illuminated at maximum intensity to exhibit a uniform illumination effect similar to diffuse reflection, thereby facilitating detection of slowly varying defect features.
Wherein the display data further comprises switching speeds of adjacent rows and adjacent columns. In this embodiment, the LED array is controlled to display, so that adjacent rows and columns are switched at a predetermined switching speed, which is beneficial to obtaining an illumination effect adapted to the actual requirements.
It can be understood that in this embodiment, the switching speed of up to 500KHz can be achieved by performing circuit control by using a high-speed machine-to-machine manner for each row and each column of the LED array.
Further, the target lighting template further comprises: irradiation angle.
Correspondingly, the display data also comprises angle data;
Referring to fig. 3, therefore, in step S3, based on the display data, controlling the LED array to display includes:
s31, adjusting the placement angle of the LED array based on the angle data;
S32, controlling the LED array to be positioned at the target placement angle for display.
In practical application, current pose data of the LED array are acquired through the multi-axis gyroscope sensor chip, the acquired data are converted, so that corresponding angle values are obtained, and the placement angle of the LED array is adjusted according to the angle values; when the LED array is displayed under the target placement angle, a certain irradiation angle can be formed on the detected surface of the target detection object, so that detection of fine defects is facilitated.
Referring to fig. 4, further, in the present embodiment, the programmable phase shift controlled illumination method further includes:
S01, acquiring the current state of a target detection object;
s02, executing an operation corresponding to the current state of the target detection object according to a preset template, wherein the operation comprises continuous display or stopping display.
In the step, when the target detection object is in a moving state or a static state, the control LED array can be freely set, and display is continued or stopped according to the application scene.
It can be understood that when the illumination method is applied to detecting a coil type product, after a target detection object is replaced or the device is suspended, when the device is restarted, the device needs to be reversed for a certain distance for positioning, and then forward rotation detection is restarted, and if the motion state cannot be identified in the reverse rotation process of the device, the camera still photographs when the device is reversed, so that image abnormality is easily caused, and misjudgment is caused.
In this embodiment, by acquiring the phase signal during the transmission and the inverse transmission, the aberration of the a-phase signal and the B-phase signal generated during the forward rotation or the inverse rotation of the driving element is 90 degrees, so as to identify whether the current target detection object is in the forward rotation or the inverse rotation state, and decode based on the FPGA chip, so as to obtain the motion state of the target detection object. The forward and reverse rotation identification function provided by the embodiment can effectively prevent the camera from not photographing when the equipment is reversed, so that misjudgment caused by abnormal pictures is avoided.
Referring to fig. 5 to fig. 7 in combination, based on the foregoing embodiment, an embodiment of the present invention further provides a programmable phase shift controlled illumination source, for implementing the programmable phase shift controlled illumination method as described above, including:
an acquisition unit 10 for acquiring a target illumination template;
a processing unit 20 for disassembling the target illumination template into display data, the display data comprising a plurality of row display data and a plurality of column display data;
And a display control unit 30 for controlling the LED array to display based on the display data.
Specifically, the acquiring unit 10 includes a PC end, the processing unit 20 includes a processing unit 20, and the display control unit 30 includes a main control FPGA chip and a CPLD expansion chip, where the CPLD expansion chip is used to perform display control on each lamp panel in the LED array.
The PC end presets the image to be switched and lighted, so as to obtain a target illumination template, and sends the target illumination template to the MCU through a serial port/network port; it can be understood that the patterns can be set with 1 group or more than 1 group of different patterns (the number depends on the capacity of the memory chip), the MCU splits the preset data into a plurality of corresponding row display data and a plurality of corresponding column display data, and then sends the corresponding row display data and the corresponding column display data to the main control FPGA chip, and after the main control FPGA chip receives the preset data, the corresponding row CPLD expansion chip and the corresponding column CPLD expansion chip are respectively transmitted to control the LED array to display.
Wherein each of the row display data and the column display data includes: the on-off parameters and the light intensity parameters of the individual light sources in each row and each column; the main control FPGA chip and the CPLD expansion chip are used for controlling the LED arrays of each row and each column to display based on the on-off parameters and the light intensity parameters of the single light source in each row and each column in a cascading control mode.
Further, the display data further includes a switching speed of adjacent rows and adjacent columns, and an illumination angle; the display control unit 30 includes an angle adjustment subunit;
The display control unit 30 is configured to perform switching display of the adjacent rows and the adjacent columns according to the switching speeds of the adjacent rows and the adjacent columns;
the angle adjustment subunit comprises an angle sensor and a driver, wherein the angle sensor is used for sensing the placement angle of the LED array, and the driver is used for driving and adjusting the LED array to the target placement angle based on the irradiation angle.
The control principle of the invention is described in further detail below with reference to fig. 6 and 7:
The invention adopts a high-speed FPGA chip and a CPLD chip, and performs switch control on each row and each column of LED lamp beads on each LED lamp panel of the LED array. The FPGA chip is used as a main control, and the CPLD chip is used as a control switch signal to be output to the driving MOS tube.
1. The method comprises the steps that a PC end presets an image to be switched and lighted, a target illumination template is obtained, the image is sent to an MCU through a serial port/internet access, the number of the image depends on the capacity of a storage chip through presetting a plurality of images to be lighted, an image matched with a detection scene is selected as the target illumination template, the MCU splits the target illumination template into a plurality of corresponding row display data and a plurality of corresponding column display data, the corresponding row display data and the corresponding column display data are sent to an FPGA, and after the FPGA receives the preset data, the corresponding row CPLD and the corresponding column CPLD are respectively transmitted by the corresponding row display data and the corresponding column CPLD.
Based on the method, the device and the system can realize irradiation of the measured object at different angles by switching the lighting of each row and each column of the light source at high speed and performing high-speed shift switching through the preset parameters, so that the required target image is obtained. Different from the common LCD screen, the switching speed of the common LCD screen is low, the highest switching speed of the common LCD screen in the market at present is only 240Hz, the efficiency is extremely low in industrial production, and the product is characterized by high-speed switching, the highest switching speed can reach 500KHz, and the product can be suitable for more application scenes.
2. And receiving an externally input differential signal, decoding by using an FPGA chip, and identifying the motion state of the target detection object by utilizing the principle that the phase A phase and the phase B phase generated during forward rotation or reverse rotation of the equipment differ by 90 degrees.
It can be understood that when the device detects a product of a coil type, after the detected product is replaced or the device is suspended, and when the device is restarted, the device needs to be reversed for a certain distance (the purpose of reversing is to be used for positioning), and then the forward rotation detection is restarted, and the device cannot be identified by a common light source in the reverse rotation process, so that the camera still shoots when the device is reversed, and the image is abnormal, so that misjudgment is generated. The light source provided by the embodiment of the invention has the forward and reverse rotation identification function, and can effectively prevent the camera from not photographing when the equipment is reversed, so that the abnormality of the photographed picture is avoided, and the generation of misjudgment is avoided.
3. And acquiring pose data through a multi-axis gyroscope sensor chip, and converting the acquired data into corresponding angle values.
Since different illumination angles can be used to detect target detection objects of different materials and different surface features, fine defects of the product are revealed. The angle adjustment of the common light source is realized through tools such as a ruler, a protractor, a graduated scale and the like, and the error is larger during adjustment. The invention uses the built-in angle sensor to be on the same plane with the lamp beads in the light source, the measured angle value is closer to the irradiation angle of the light source, and the measuring tool is omitted, and the display can be directly read through the PC end, thereby saving the adjusting time and improving the efficiency.
Based on the foregoing, the present invention has the following advantages:
1. The control scheme comprises a high-speed multistage cascade transmission mode: the circuit scheme of independent control of rows and columns is adopted on the basis of the existing planar light source, a main control board is matched with an IO expansion board, the main control board consists of an MCU chip and an FPGA chip, and the IO expansion board consists of 1 or more CPLD chips, so that the display effect can be switched at high speed.
2. The device can be identified to currently process a forward rotation and reverse rotation state: and identifying the forward and reverse states of the target detection object according to the mode of 90-degree phase difference of the input phase A phase difference signal and the input phase B phase difference signal.
3. The placement angle of the LED array can be identified: the method is realized by adopting a gyroscope mode and converting the gyroscope mode into an angle mode through software processing.
4. The frequency of the external trigger signal can be identified: the method is realized by adopting a high-speed response mode of an FPGA chip and converting the high-speed response mode into frequency through software processing. The existing encoders (signal generators) on the market have large output frequency errors, and the encoder is influenced by the rotation speed of the servo motor and cannot be determined, so that relevant parameters are difficult to match, and special tools and technicians are needed for measuring the frequency of equipment. The invention can be characterized in that the output frequency corresponding to the current rotation speed of the equipment can be detected out quickly, so that the corresponding parameters can be matched out quickly.
Based on the above embodiments, the invention adds the circuit scheme of independent control of each row and each column of the light source on the basis of the existing planar light source, the circuit control scheme adopts a high-speed cascading mode, specifically an FPGA chip is used as a main control, a CPLD chip is used as IO expansion, and the highest switching speed can reach 500KHz, thereby realizing high-balance illumination. In addition, the invention uses the high-speed switching algorithm of the FPGA chip to control the lighting states of a plurality of rows and columns of the illumination light source by cascading one or more CPLD chips from the spectrum distribution, the energy distribution, the intensity distribution, the angle, the high-speed phase shift of the illumination light source and the start-stop control according to the forward and reverse signals, so that the defect characteristics of micro scratches, pits and the like on the measured object are more obvious.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A programmable phase shift controlled illumination method comprising:
Acquiring a target illumination template, wherein the target illumination template comprises an illumination angle;
disassembling the target illumination template into display data, the display data comprising a plurality of row display data and a plurality of column display data, the display data comprising angle data;
And controlling the LED array to display based on the display data.
2. A programmable phase shift controlled illumination method as claimed in claim 1, wherein each of the row display data and column display data comprises:
The on-off parameters and the light intensity parameters of the individual light sources in each row and each column.
3. A programmable phase shift controlled illumination method as claimed in claim 1, wherein the display data further comprises switching speeds of adjacent rows and adjacent columns.
4. The programmable phase shift controlled illumination method of claim 1, wherein the obtaining a target illumination template comprises:
Determining a current detection scene;
and acquiring a corresponding target illumination template according to the current detection scene.
5. A programmable phase shift controlled illumination method according to claim 1, wherein the target illumination template comprises:
The illumination pattern is formed by combining a plurality of bright spots, and the light intensity of each bright spot is the same or different.
6. A programmable phase shift controlled illumination method as claimed in claim 1, wherein said controlling the LED array for display based on said display data comprises:
adjusting the placement angle of the LED array based on the angle data;
and controlling the LED array to be positioned at the target placement angle for display.
7. A programmable phase shift controlled illumination method as claimed in claim 1, further comprising:
acquiring the current state of a target detection object;
and executing an operation corresponding to the current state of the target detection object according to a preset template, wherein the operation comprises continuing display or stopping display.
8. A programmable phase shift controlled illumination source, characterized by an illumination method for implementing a programmable phase shift controlled illumination as claimed in any one of claims 1 to 7, comprising:
An acquisition unit configured to acquire a target illumination template;
The processing unit is used for disassembling the target illumination template into display data, wherein the display data comprises a plurality of row display data and a plurality of column display data;
And the display control unit is used for controlling the LED array to display based on the display data.
9. The programmable phase shift controlled illumination source of claim 8, wherein each of the row display data and column display data comprises:
the on-off parameters and the light intensity parameters of the individual light sources in each row and each column;
The display control unit comprises a main control FPGA chip and a CPLD expansion chip, and the main control FPGA chip and the CPLD expansion chip are used for controlling the LED arrays of each row and each column to display based on the on-off parameters and the light intensity parameters of the single light source in each row and each column in a cascading control mode.
10. The programmable phase shift controlled illumination source of claim 9, wherein the display data further includes switching speeds of adjacent rows and adjacent columns, and illumination angles;
the display control unit comprises an angle adjustment subunit;
the display control unit is used for switching display of the adjacent rows and the adjacent columns according to the switching speed of the adjacent rows and the adjacent columns;
the angle adjustment subunit comprises an angle sensor and a driver, wherein the angle sensor is used for sensing the placement angle of the LED array, and the driver is used for driving and adjusting the LED array to the target placement angle based on the irradiation angle.
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- 2024-02-29 CN CN202410227150.XA patent/CN117929391A/en active Pending
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| WO2006080023A1 (en) * | 2005-01-31 | 2006-08-03 | Cognitens Ltd. | Method and system for illumination adjustment |
| CN1877281A (en) * | 2005-06-10 | 2006-12-13 | 精工爱普生株式会社 | Display panel module, display unit, inspection device for display panel |
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