CN105575304A - Laser projection picture brightness adjusting method and device - Google Patents
Laser projection picture brightness adjusting method and device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
An embodiment of the invention provides a laser projection picture brightness adjusting method and device. The method comprises the following steps: obtaining a first brightness value for displaying light beam of a picture to be displayed, wherein the picture to be displayed is any picture displayed in a laser projection screen; judging whether the first brightness value is larger than a preset threshold value; if so, turning off a laser; and if not, obtaining a gray-scale value of the picture to be displayed and a second brightness value matched with the gray-scale value, and adjusting the brightness of the light beam of a light source according to the first brightness value and the second brightness value to enable the brightness value for displaying the light beam of the picture to be displayed to be equal to the second brightness value. The adjusting method and device are used for adjusting the brightness of the picture displayed on the laser projection screen in time.
Description
Technical field
The embodiment of the present invention relates to TV technology, particularly relates to a kind of laser projection screen brightness adjustment method and device.
Background technology
Along with improving constantly of science and technology, Color Laser Projection Technology is widely used, and in Color Laser Projection Technology, by carrying out signal madulation to LASER Light Source light beam, shows the picture that needs are play in laser projection screen.
Core component in Color Laser Projection Technology is digital micro-mirror chip (DigitalMicromirrorDevices, be called for short DMD), be provided with multiple with the catoptron of array way arrangement in DMD, each catoptron is corresponding with the pixel of in laser projection screen respectively, in practical work process, light beam of light source is radiated at after on each catoptron, controller is according to the eigenwert on each pixel in picture to be shown, each catoptron is controlled, each catoptron is made to carry out the rotation of different angles, according to the difference of the anglec of rotation, the light beam of light source be radiated on each catoptron is reflected onto camera lens or light absorption units, reflex to the light beam of camera lens for showing picture to be shown.
Wherein, laser instrument is the basic luminescent device of LASER Light Source, the brightness of the power influences light beam of light source of laser instrument, thus affect the brightness of the picture shown on laser projection screen, but laser instrument in use can receive environment temperature,, the situation of brightness decay or other brightness instability may be there is in the impact of the environmental factors such as dust.。
In the prior art, usually in the following way the brightness of the picture that laser projection screen shows is regulated: obtain the picture brightness curve in preset duration in laser projection screen, when the dough softening of the picture brightness curve in a preset duration is greater than predetermined threshold value, then the power of laser instrument is changed to predetermined power, to regulate the brightness value of display frame on laser projection screen on the constant luminance expected, but, in the prior art, owing to regulating according to the brightness of picture brightness curve to picture in preset duration, need data accumulation and the experiment measuring of long period, can not adjust the change of picture brightness in time, make image quality poor, reduce user's viewing experience.
Summary of the invention
The embodiment of the present invention provides a kind of laser projection screen brightness adjustment method and device, regulates for the timely picture brightness to laser projection screen shows.
First aspect, the embodiment of the present invention provides a kind of laser projection screen brightness adjustment method, is applied to laser projection, and described method comprises:
Obtain the first brightness value of the light beam for showing picture to be shown, described picture to be shown is any one picture shown in laser projection screen;
Judge whether described first brightness value is greater than predetermined threshold value;
If so, described laser instrument is then closed;
If not, obtain the grey decision-making of described picture to be shown and the second brightness value of described grey decision-making coupling, and according to described first brightness value and described second brightness value, adjustment process is carried out to the brightness of light beam of light source, equals described second brightness value to make the described brightness value for the light beam showing described picture to be shown.
Second aspect, the embodiment of the present invention provides a kind of laser projection picture brightness regulating device, and described application of installation is in laser projection, and described device comprises:
First acquisition module, for obtaining the first brightness value of the light beam for showing picture to be shown, described picture to be shown is any one picture shown in laser projection screen;
Judge module, for judging whether described first brightness value is greater than predetermined threshold value;
Closing module, during for judging that described first brightness value is greater than described predetermined threshold value at described judge module, closes described laser instrument;
Second acquisition module, during for judging that described first brightness value is less than or equal to described predetermined threshold value at described judge module, obtains the grey decision-making of described picture to be shown and the second brightness value of described grey decision-making coupling;
Adjustment module, for according to described first brightness value and described second brightness value, carries out adjustment process to the brightness of light beam of light source, equals described second brightness value to make the described brightness value for the light beam showing described picture to be shown.
The laser projection screen brightness adjustment method that the embodiment of the present invention provides and device, for any one picture to be shown being about to show in laser projection screen, obtain the first brightness value of the light beam for showing picture to be shown, judge whether this first brightness value is greater than predetermined threshold value, if this first brightness value is greater than predetermined threshold value, then close laser instrument, with the light avoiding the picture on laser projection screen to send, user is damaged, if the first brightness value is not more than predetermined threshold value, then obtain the grey decision-making of picture to be shown, and the second brightness value of grey decision-making coupling, this second brightness value is under this grey decision-making, make the brightness value of picture display effect optimum, and according to the first brightness value and the second brightness value, adjustment process is carried out to the brightness of light beam of light source, the second brightness value is equaled with the brightness value being used in the light beam showing described picture to be shown.In above process, brightness regulating apparatus is for any one picture to be shown, in real time according to the grey decision-making of this picture to be shown, the brightness value of the light beam for showing this picture to be shown is regulated, the brightness value of the light beam for showing this picture to be shown is mated with the grey decision-making of this picture to be shown, and then make the image quality of this picture to be shown reach optimum, further, brightness regulating apparatus all performs said process for any one picture to be shown, the quality of any one picture shown in laser projection screen is made all to reach optimum, improve the image quality shown on laser projection screen.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the laser projection system that Fig. 1 provides for the embodiment of the present invention;
The schematic flow sheet of the laser projection screen brightness adjustment method that Fig. 2 provides for the embodiment of the present invention;
The acquisition that Fig. 3 provides for the embodiment of the present invention is for showing the process flow diagram of the first brightness value method of the light beam of picture to be shown;
The transmitting procedure schematic diagram of the light beam of light source that Fig. 4 provides for the embodiment of the present invention;
The process flow diagram of the grey decision-making method of the acquisition picture to be shown that Fig. 5 provides for the embodiment of the present invention;
Fig. 6 carries out the process flow diagram of control method for the brightness to light beam of light source that the embodiment of the present invention provides;
The structural representation one of the laser projection picture brightness regulating device that Fig. 7 provides for the embodiment of the present invention;
The structural representation two of the laser projection picture brightness regulating device that Fig. 8 provides for the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
The structural representation of the laser projection system that Fig. 1 provides for the embodiment of the present invention, please refer to Fig. 1, laser projection system comprises laser instrument 101, beam treatment unit 102, digital micro-mirror chip 103, DMD graphics processing unit 104, projection lens 105 and laser projection screen 106, the laser beam that beam treatment unit 102 pairs of laser instruments 101 produce carries out process and obtains light beam of light source, such as, the laser beam that beam treatment unit 102 pairs of laser instruments 101 produce carries out beam shaping, laser beam and fluorescent light beam are carried out hybrid processing etc. and obtains light beam of light source, light beam of light source exposes to digital micro-mirror chip 103 (DMD), DMD103 according to DMD graphics processing unit to the result of image to be displayed the eigenwert of each pixel (in the such as image to be displayed), each catoptron of DMD103 inside is controlled, different angles is rotated to make each catoptron, carry out each catoptron postrotational and light beam of light source is reflexed to projection lens, projection lens by the light beam projecting that receives to laser projection screen 106, and on laser projection screen, present image corresponding to vision signal.
The process flow diagram of the laser projection screen brightness adjustment method that Fig. 2 provides for the embodiment of the present invention, the executive agent of the method is laser projection picture brightness regulating device (hereinafter referred brightness regulating apparatus), and please refer to Fig. 2, the method can comprise:
S201, obtain the first brightness value of the light beam for showing picture to be shown, picture to be shown is any one picture shown in laser projection screen;
S202, judge whether the first brightness value is greater than predetermined threshold value;
If so, then S203 is performed;
If not, then S204-S205 is performed;
S203, closedown laser instrument;
Second brightness value of S204, the grey decision-making obtaining picture to be shown and grey decision-making coupling;
S205, according to the first brightness value and the second brightness value, to the brightness of light beam of light source carry out adjustment process, equal the second brightness value with the brightness value being used in the light beam showing described picture to be shown.
In embodiments of the present invention, laser projection screen playing pictures, video etc. can be passed through, when playing video by laser projection screen, brightness regulating apparatus is for each frame (each picture) in video, all carry out being processed by the method shown in S201-S205, below, for the processing procedure of brightness regulating apparatus to a picture to be shown (frame), the method shown in Fig. 2 is described in detail.
Light source in the embodiment of the present invention can be monochromatic laser light source, also can be two-color laser light source, in monochromatic laser light source, laser instrument sends blue laser, this blue laser can be transformed out red fluorescence and green fluorescence by Wavelength converter, then by this blue laser, the mixed light of red fluorescence and green fluorescence is as light beam of light source, in two-color laser light source, laser instrument sends blue laser and red laser, by Wavelength converter, this blue laser is transformed out green fluorescence, then by this blue laser, the mixed light of red laser and green fluorescence is as light beam of light source.
In actual application, the picture to be shown shown in laser projection screen as required, multiple catoptrons that DMD controls its inside rotate, and make the part in light beam of light source to be reflected onto camera lens, for showing picture to be shown in laser projection screen.Carry out in the process regulated in the brightness treating display frame, after brightness regulating apparatus obtains the first brightness value for showing picture to be shown, judge whether this first brightness value is greater than predetermined threshold value, this predetermined threshold value is the maximum brightness value be harmful to user, in actual application, the size of this predetermined threshold value can be set according to actual needs, if judge, the first brightness value is greater than predetermined threshold value, illustrate that the laser that laser instrument produces may occur exception, the brightness value of the picture shown in laser projection screen is harmful to user, in order to ensure user security, directly laser instrument is closed.
If judge, the first brightness value is not more than predetermined threshold value, reach optimum to make the picture display effect in laser projection screen, can according to the grey decision-making of picture to be shown, the brightness of the light beam for showing picture to be shown is regulated, concrete, brightness regulating apparatus obtains the grey decision-making of picture to be shown, and according to grey decision-making, obtain the second brightness value of this grey decision-making coupling, this second brightness value is when the grey decision-making of picture is for this grey decision-making, make the brightness value of picture display effect optimum, because the first brightness value of the light beam for showing picture to be shown and the brightness value of light beam of light source have certain proportionate relationship, therefore, can by regulating the brightness of light beam of light source, to change light beam first brightness value for showing picture to be shown, the brightness value of the light beam for showing picture to be shown is made to equal the second brightness value.
The laser projection screen brightness adjustment method that the embodiment of the present invention provides, for any one picture to be shown being about to show in laser projection screen, obtain the first brightness value of the light beam for showing picture to be shown, judge whether this first brightness value is greater than predetermined threshold value, if this first brightness value is greater than predetermined threshold value, then close laser instrument, with the light avoiding the picture on laser projection screen to send, user is damaged, if the first brightness value is not more than predetermined threshold value, then obtain the grey decision-making of picture to be shown, and the second brightness value of grey decision-making coupling, this second brightness value is under this grey decision-making, make the brightness value of picture display effect optimum, and according to the first brightness value and the second brightness value, adjustment process is carried out to the brightness of light beam of light source, the second brightness value is equaled with the brightness value being used in the light beam showing described picture to be shown.In above process, brightness regulating apparatus is for any one picture to be shown, in real time according to the grey decision-making of this picture to be shown, the brightness value of the light beam for showing this picture to be shown is regulated, the brightness value of the light beam for showing this picture to be shown is mated with the grey decision-making of this picture to be shown, and then make the image quality of this picture to be shown reach optimum, further, brightness regulating apparatus all performs said process for any one picture to be shown, the quality of any one picture shown in laser projection screen is made all to reach optimum, improve the image quality shown on laser projection screen.
Embodiment two
On the basis of embodiment one, first brightness value (S201 in Fig. 2 embodiment) of the light beam for showing picture to be shown can be obtained by multiple feasible mode, below, be described in detail by a kind of feasible implementation to S201 embodiment illustrated in fig. 3, concrete, please refer to the embodiment shown in Fig. 3.
Fig. 3 be acquisition provided by the invention for showing the process flow diagram of the first brightness value method of the light beam of picture to be shown, the executive agent of the method is brightness regulating apparatus, please refer to Fig. 3, and the method can comprise:
S301, acquisition light beam of light source reflex to the brightness value of the light beam of light absorption units by least one reflector element;
S302, according to the number of reflector element, reflex to the brightness value of the light beam of light absorption units, the brightness value of light beam of light source, obtain the first brightness value.
In the embodiment shown in fig. 3, reflector element can be any one in the multiple catoptrons (reflector element) in DMD, multiple light absorption units can be comprised in DMD, because the multiple catoptrons in DMD arrange with array way, so a light absorption units can receive the reflected light of the part reflector element in DMD.
In the present invention, optical sensor can be set at any one light absorption units place, this optical sensor can gather the light beam reflexing to light absorption units place, and obtain the brightness value collecting the light beam reflexing to light absorption units, below, composition graphs 4, is described in detail to this kind of feasible implementation.
The transmitting procedure schematic diagram of the light beam of light source that Fig. 4 provides for the embodiment of the present invention, please refer to Fig. 4, light beam of light source is exposed to reflector element by light source 401, each reflector element carries out the rotation of different angles to reflect light beam of light source, in the diagram, light beam of light source is reflexed to light absorption units 403 by reflector element 402-1, the optical sensor arranging early light absorption units process can collect the light beam reflexing to light absorption units 403, light beam of light source is reflexed to camera lens 405 by reflector element 402-2, reflexes to the light beam of camera lens 405 for showing picture to be shown; It should be noted that, in actual application, MDM comprises multiple reflector element, in the diagram, for convenience of description, only illustrates 2 reflector elements.
In actual application, the light beam reflexing to light absorption units may comprise laser and fluorescence, optionally, optical sensor only can gather a kind of monochromatic light (one-wavelength laser or one-color fluorescence) in light beam, obtain the monochromatic brightness value that collects, and according to monochromatic brightness value computational reflect to the brightness value of the light beam of light absorption units.
After the brightness value obtaining the light beam reflexing to light absorption units, brightness regulating apparatus according to the number of reflector element, reflex to the brightness value of the light beam of light absorption units, the brightness value of light beam of light source, obtain the first brightness value, concrete, the first brightness value can be obtained by following formula one:
Wherein, L
1be the first brightness value, N is the number of reflector element, and X is the brightness value of light beam of light source, and M is the brightness value of the light beam reflexing to light absorption units, and P is the optical loss coefficient that light beam of light source transfers to camera lens, is generally a fixed value.
Exemplary, suppose that the brightness value of light beam of light source is X=10, in DMD, the first light absorption units can receive the reflected light of N=10 catoptron, at the first light absorption units place, optical sensor is set, suppose that the brightness value of the light that optical sensor collects is M=10, optical loss coefficient from catoptron to camera lens is P=10%, then the first brightness value calculated according to formula one is:
In above process, because a part of light beam in light beam of light source is reflected onto light light absorption units, another part light beam is reflected onto camera lens, the light beam being reflected onto camera lens is the light beam for showing picture to be shown, therefore, the brightness of the light beam reflexing to camera lens can be obtained by the brightness calculation of the light beam reflexing to light absorption units place, by arranging optical sensor at light absorption units place, obtain the brightness of the light beam for showing picture to be shown, light due to light absorption units place is without using up, at light absorption units place, the normal transmission that optical sensor can not affect light is set, more can not the light beam transferring to camera lens be had any impact.
Embodiment three
On the basis of above-mentioned any embodiment, can by multiple feasible mode realize embodiment illustrated in fig. 2 in S204, below, be described in detail by a kind of feasible implementation of the grey decision-making to the picture to be shown of the acquisition in S204 embodiment illustrated in fig. 5, concrete, please refer to the embodiment shown in Fig. 5.
Fig. 5 is the process flow diagram of the grey decision-making method of acquisition provided by the invention picture to be shown, and the executive agent of the method is brightness regulating apparatus, please refer to Fig. 5, and the method can comprise:
S501, obtain picture to be shown, and picture to be shown is converted to gray level image;
The grey decision-making of each pixel in S502, acquisition gray level image;
S503, obtain the mean value of each pixel gray level value, using the grey decision-making of the mean value of each pixel gray level value as picture.
In this kind of feasible implementation, in actual use, the pixel comprised due to picture is more, in order to obtain the calculated amount of picture grey decision-making, the grey decision-making of partial pixel in gray level image can be obtained, such as, only obtain the grey decision-making of the pixel of even number line and even column in gray level image, and using the grey decision-making of the mean value of the grey decision-making of the pixel in even number line and even column as picture.
On the basis of above-mentioned any embodiment, the value of the second brightness of grey decision-making coupling can be obtained by following formula two:
Wherein, L
2be the second brightness value, H is the grey decision-making of picture, and K is the figure place of picture, and γ is default adjustment factor, and Z is default adjustment ratio, and Z is greater than 1, and is less than 1.
In actual application, the figure place of usual picture is 8,10 etc., can arrange adjustment factor γ according to actual needs and regulate ratio Z, and optionally, γ can be 2.2 or 2.4 etc., and Z can be 1.2 or 1.3 etc.
Embodiment four
On the basis of above-mentioned any embodiment, can realize carrying out regulating process (S205 in embodiment illustrated in fig. 2) to the brightness of light beam of light source by multiple feasible mode, below, be described in detail by a kind of feasible implementation to S205 embodiment illustrated in fig. 6, concrete, please refer to the embodiment shown in Fig. 6.
Fig. 6 carries out the process flow diagram of control method for the brightness to light beam of light source that the embodiment of the present invention provides, and the executive agent of the method is brightness regulating apparatus, please refer to Fig. 6, and the method can comprise:
S601, according to the brightness value of the first brightness value, light beam of light source and optical loss coefficient, obtain effective ratio of the brightness value to the brightness value of the light beam of lens reflex and light beam of light source;
S602, according to the second brightness value, effectively ratio and optical loss coefficient, obtain target brightness value;
S603, according to target brightness value, the drive singal of laser instrument to be regulated, make the brightness value of light beam of light source be adjusted to target brightness value.
Carry out in the process regulated in the brightness treating display frame, according to brightness value and the optical loss coefficient of the first brightness value, light beam of light source, determine effective ratio of the brightness value of the first brightness value and light beam of light source, this ratio be greater than zero and be less than 1 number, then according to the second brightness value and this effective ratio, the target brightness value that light beam of light source need be adjusted to is obtained.
After acquiring target brightness value, the drive singal of laser instrument is regulated, target brightness value is adjusted to make the brightness value of light beam of light source, optionally, can by regulating the drive current of laser instrument, to regulate the power of laser instrument, because the power of laser instrument and the brightness value of light beam of light source have preset relation, therefore, the brightness value of light beam of light source can be realized to be adjusted to target brightness value to the adjustment of the power of laser instrument; Optionally, can also, by regulating pulse-length modulation (PulseWidthModulation the is called for short PWM) ripple of laser instrument, realize the brightness value of light beam of light source to be adjusted to target brightness value.
Below, by concrete example, the method shown in Fig. 6 is described in detail.
Exemplary, suppose that the brightness value of light beam of light source is 10, what acquire is 6.3 for showing the first brightness value of picture to be shown, and optical loss coefficient is 10%, then the brightness value to the light beam of described lens reflex is
therefore, the effective ratio to the brightness value of the brightness value of the light beam of lens reflex and light beam of light source is 0.7.
Suppose that the second brightness value acquired is 8, then according to the second brightness value and ratio 0.7, determine that target brightness value is
then the power of target brightness value 12.6 correspondence is obtained, by the power adjustments of laser instrument to the power of target brightness value 12.6 correspondence, the brightness value of light beam of light source is made to be adjusted to 12.6, when the brightness value of light beam of light source is adjusted to 12.6, the brightness value for the light beam showing picture to be shown is then adjusted to 8.
Embodiment five
The structural representation one of the laser projection picture brightness regulating device that Fig. 7 provides for the embodiment of the present invention, this application of installation, in laser projection, please refer to Fig. 7, and this device can comprise:
First acquisition module 701, for obtaining the first brightness value of the light beam for showing picture to be shown, picture to be shown is any one picture shown in laser projection screen;
Judge module 702, for judging whether the first brightness value is greater than predetermined threshold value;
Closing module 703, during for judging that the first brightness value is greater than predetermined threshold value at judge module, closes laser instrument;
Second acquisition module 704, during for judging that the first brightness value is less than or equal to predetermined threshold value at judge module, obtains the grey decision-making of picture to be shown and the second brightness value of grey decision-making coupling;
Adjustment module 705, for according to the first brightness value and the second brightness value, carries out adjustment process to the brightness of light beam of light source, equals the second brightness value with the brightness value being used in the light beam showing picture to be shown.
The structural representation two of the laser projection picture brightness regulating device that Fig. 8 provides for the embodiment of the present invention, on basis embodiment illustrated in fig. 7, please refer to Fig. 8, the first acquisition module 701 can comprise the first acquiring unit 7011 and second acquisition unit 7012, wherein,
First acquiring unit 7011 for, obtain light beam of light source and reflexed to the brightness value of the light beam of light absorption units by least one reflector element;
Second acquisition unit 7012 for, according to the number of reflector element, reflex to the brightness value of the light beam of light absorption units, the brightness value of light beam of light source, obtain the first brightness value.
Optionally, second acquisition unit 7012 specifically may be used for:
The first brightness value is obtained according to following formula one;
Wherein, L
1be the first brightness value, N is the number of reflector element, and X is the brightness value of light beam of light source, and M is the brightness value of the light beam reflexing to light absorption units, and P is the optical loss coefficient that light beam of light source transfers to laser projection screen.
In actual application, optionally, the second acquisition module 704 specifically may be used for:
Obtain picture to be shown, and picture to be shown is converted to gray level image;
Obtain the grey decision-making of each pixel in gray level image;
Obtain the mean value of each pixel gray level value, using the grey decision-making of the mean value of each pixel gray level value as picture.
Further, the second acquisition module 704 specifically can also be used for:
The value of the second brightness of grey decision-making coupling is obtained according to following formula two:
Wherein, L
2be the second brightness value, H is grey decision-making, and K is the figure place of picture, and γ is default adjustment factor, and Z is default adjustment ratio, and Z is greater than 1, and is less than 1.
Optionally, adjustment module 705 specifically may be used for:
According to brightness value and the optical loss coefficient of the first brightness value, light beam of light source, obtain effective ratio of the brightness value to the brightness value of the light beam of lens reflex and light beam of light source;
According to the second brightness value, effectively ratio and loss factor, obtain target brightness value;
According to target brightness value, the drive singal of laser instrument is regulated, make the brightness value of light beam of light source be adjusted to target brightness value.
Device shown in the embodiment of the present invention can perform the technical scheme shown in above-mentioned Fig. 1-Fig. 6 embodiment of the method, and it realizes principle and beneficial effect is similar, no longer repeats herein.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that programmed instruction is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a laser projection screen brightness adjustment method, is characterized in that, is applied to laser projection, and described method comprises:
Obtain the first brightness value of the light beam for showing picture to be shown, described picture to be shown is any one picture will shown in laser projection screen;
Judge whether described first brightness value is greater than predetermined threshold value;
If so, then laser instrument is closed;
If not, obtain the grey decision-making of described picture to be shown and the second brightness value of described grey decision-making coupling, and according to described first brightness value and described second brightness value, adjustment process is carried out to the brightness of light beam of light source, equals described second brightness value to make the described brightness value for the light beam showing described picture to be shown.
2. method according to claim 1, is characterized in that, described acquisition, for showing the first brightness value of the light beam of picture to be shown, comprising:
Obtain described light beam of light source reflexes to the light beam of light absorption units brightness value by least one reflector element;
According to the number of reflector element, reflex to the brightness value of the light beam of described light absorption units, the brightness value of described light beam of light source, obtain described first brightness value.
3. method according to claim 2, is characterized in that, the described number according to reflector element, reflexes to the brightness value of the light beam of described light absorption units, the brightness value of described light beam of light source, obtains described first brightness value, comprising:
Described first brightness value is obtained according to following formula one;
Wherein, described L
1for described first brightness value, described N is the number of described reflector element, and described X is the brightness value of described light beam of light source, and described M is the brightness value of the light beam reflexing to described light absorption units, and described P is the optical loss coefficient that described light beam of light source transfers to camera lens.
4. the method according to any one of claim 1-3, is characterized in that, obtains the grey decision-making of described picture to be shown, comprising:
Obtain described picture to be shown, and described picture to be shown is converted to gray level image;
Obtain the grey decision-making of each pixel in gray level image;
Obtain the mean value of each pixel gray level value, using the grey decision-making of the mean value of described each pixel gray level value as described picture to be shown.
5. the method according to any one of claim 1-3, is characterized in that, the value of the second brightness of the described grey decision-making coupling of described acquisition, comprising:
The value of the second brightness of described grey decision-making coupling is obtained according to following formula two:
Wherein, described L
2for described second brightness value, described H is described grey decision-making, and described K is the figure place of described picture, and described γ is default adjustment factor, and described Z is default adjustment ratio, and described Z is greater than 1, and is less than 1.
6. method according to claim 3, is characterized in that, described according to described first brightness value and described second brightness value, carries out adjustment process, comprising the brightness of described light beam of light source:
According to brightness value and the described optical loss coefficient of described first brightness value, described light beam of light source, obtain effective ratio of the brightness value to the brightness value of the light beam of described lens reflex and described light beam of light source;
According to described second brightness value, described effective ratio and described loss factor, obtain target brightness value;
According to described target brightness value, the drive singal of described laser instrument is regulated, make the brightness value of described light beam of light source be adjusted to described target brightness value.
7. a laser projection picture brightness regulating device, is characterized in that, described application of installation is in laser projection, and described device comprises:
First acquisition module, for obtaining the first brightness value of the light beam for showing picture to be shown, described picture to be shown is any one picture shown in laser projection screen;
Judge module, for judging whether described first brightness value is greater than predetermined threshold value;
Closing module, during for judging that described first brightness value is greater than described predetermined threshold value at described judge module, closes described laser instrument;
Second acquisition module, during for judging that described first brightness value is less than or equal to described predetermined threshold value at described judge module, obtains the grey decision-making of described picture to be shown and the second brightness value of described grey decision-making coupling;
Adjustment module, for according to described first brightness value and described second brightness value, carries out adjustment process to the brightness of described light beam of light source, equals described second brightness value to make the described brightness value for the light beam showing described picture to be shown.
8. device according to claim 7, is characterized in that, described first acquisition module comprises the first acquiring unit and second acquisition unit, wherein,
Described first acquiring unit is used for, and obtains light beam of light source reflexes to the light beam of light absorption units brightness value by least one reflector element;
Described second acquisition unit is used for, and according to the number of reflector element, reflexes to the brightness value of the light beam of described light absorption units, the brightness value of described light beam of light source, obtains described first brightness value.
9. device according to claim 8, is characterized in that, described second acquisition unit specifically for:
Described first brightness value is obtained according to following formula one;
Wherein, described L
1for described first brightness value, described N is the number of described reflector element, described X is the brightness value of described light beam of light source, and described M is the brightness value of the light beam reflexing to described light absorption units, and described P is the optical loss coefficient that described light beam of light source transfers to described laser projection screen.
10. device according to claim 9, is characterized in that, described adjustment module specifically for:
According to brightness value and the described optical loss coefficient of described first brightness value, described light beam of light source, obtain effective ratio of the brightness value to the brightness value of the light beam of described lens reflex and described light beam of light source;
According to described second brightness value, described effective ratio and described loss factor, obtain target brightness value;
According to described target brightness value, the drive singal of described laser instrument is regulated, make the brightness value of described light beam of light source be adjusted to described target brightness value.
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