CN108234975A - Combination color homogeneity and consistency control method based on video camera - Google Patents
Combination color homogeneity and consistency control method based on video camera Download PDFInfo
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- CN108234975A CN108234975A CN201711475384.2A CN201711475384A CN108234975A CN 108234975 A CN108234975 A CN 108234975A CN 201711475384 A CN201711475384 A CN 201711475384A CN 108234975 A CN108234975 A CN 108234975A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/3147—Multi-projection systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
- H04N9/3194—Testing thereof including sensor feedback
Abstract
The invention discloses a kind of combination color homogeneities and consistency control method based on video camera, have measuring system, include more projectors, CCD camera, computer, projection screens, the wherein image device of video camera：2/3 inch 2 of 200,000 pixel 3CCD, per frame image valid pixel：1920 (level) × 1080 (vertical)；The workflow of measuring system is:Then by three colour brightness information on computer control CCD camera acquisition time projection screen, and according to these collected three colour brightnesses information, the color coordinates distribution of secondary colour on screen is calculated;By obtained color coordinates distribution, whether the color that can analyze secondary colour on screen is uniform；Pass through color automatic adjustment device, single projection display unit is compensated point by point, realize the color homogeneity in unit, and optimum apjustment is made to each unit brightness and color parameter automatically, it realizes in display system between each display unit, the consistency and stability of prolonged picture color and brightness.
Description
Technical field
The invention belongs to Projection Display control technologies, and in particular to a kind of combination color homogeneity based on video camera and
Consistency control method.
Background technology
With the high speed development of social informatization, professional monitoring center is applied and the need of the presentation of information of every profession and trade magnanimity
It asks, large-screen splicing display system plays a part of becoming more and more important in every field.Large-screen splicing wall is in electric power, finance,
The industries such as traffic obtain extensive use, and gradually to safety smart city, masses' monitoring market development.Large-screen splicing display system
System has become the indispensable key foundation system of information visualization.The DLP combinations of Novel LED light source are distinctive excellent with its
Gesture continues splicing market of taking the lead in race.Have in application field to the color homogeneity of concatenation unit and the consistency of whole wall higher
Requirement, color displays uniformity and consistency problem are the important fingers spelled the critical issue of wall display system and judged which is superior
Mark.Due to LED light source non-uniform light, the brightness irregularities that are showed on caused image, there are the dark corner effect of dark side, Yi Jiguang
The problem of color is inconsistent between unit in unit during long-play caused by source property difference and rate of decay difference
Presence.LED light source DLP splicing system color displays uniformities and consistency problem are the technical barriers that waits to study and solve
。
Invention content
To solve defect of the existing technology, the purpose of the present invention is to provide a kind of combination face based on video camera
Color uniformity and consistency control method by color automatic adjustment device, compensate single projection display unit point by point,
The color homogeneity in unit is realized, by embedded software colour consistency scheduler task to the light built in each display unit
The information for learning sensor feedback is periodically collected, and by Web broadcast information is got the color data of whole system, and certainly
It is dynamic that optimum apjustment is made to each unit brightness and color parameter, it realizes in display system between each display unit, for a long time
Picture color and brightness consistency and stability.
To achieve the above object, the technical solution adopted by the present invention：A kind of combination color homogeneity based on video camera
With consistency control method, it is characterised in that：With measuring system, include more projectors, CCD camera, computer, throwings
The image device of shadow screen, wherein video camera：2/3 inch 2 of 200,000 pixel 3CCD, per frame image valid pixel：1920 (levels)
× 1080 (vertical)；The workflow of measuring system is:Then CCD camera acquisition time projection screen is controlled by computer
On three colour brightness information, and according to these collected three colour brightnesses information, calculate the chromaticity coordinates point of secondary colour on screen
Cloth;By obtained color coordinates distribution, whether the color that can analyze secondary colour on screen is uniform,
According to color displays adjustment technology, the adjustment flow of uniformity and consistency, after measurement starts, projector's timesharing are formulated
The full frame image of output red, green, blue, three colors is thrown on projection screen, and being used as brightness by CCD high-speed cameras detects feedback apparatus
Device takes pictures to projection stitching image, then, photo is passed to control computer by USB, measure the chromaticity coordinates before screen and
Brightness, and carry out the color homogeneity of multi-projector splicing system and consistency analysis processing, finally, the adjustment that processing is obtained
As a result it is write in the flash of projector and is stored by main control software；
Wherein, the adjustment technology that projector color is shown, for each unit that system is spliced, from accounting for for R, G, B
Sky adjusts several respects and adjusts to improve the equal of color displays than adjustment, the adjustment of solid state light emitter electric current, brightness point by point compensation, six-basic-color
Even property so that each unit reaches consistent in various aspects such as the uniformities of colour brightness, and set-up procedure is as follows：1st, by adjusting solid-state
The duty ratio of source current, RGB, adjusts colour temperature and white color coordinates, large-screen splicing wall are switched to white, by adjusting power supply electricity
Flow valuve, RGB duty ratios, the coordinate value fed back with video camera are compared and constantly adjust so that result and target are close；Electric current
The purpose that adjustment, duty ratio adjust is so that the colour temperature chromaticity coordinates between each unit is close to unanimously, and the combination brightness of light source reaches
It optimizes；By changing the current value of solid state light emitter, coordinate value and desired value that measuring system is fed back to are compared simultaneously constantly
Adjustment so that result and target are close.The purpose of electric current adjustment is so that the colour temperature chromaticity coordinates between each unit is close to unanimously；Choosing
Select with aim colour warm colour coordinate closest to a duty ratio as adjustment as a result, complete duty ratio selection；2nd, six bases are adjusted
Color（RGBCMY）Tone, brightness, saturation degree, the chromaticity coordinates for making each unit is consistent；It is internally integrated by projector's processor
Pattern generator generation red, green, blue, Huang, product, blueness, white seven width pure color test chart, by projector's signal processing circuit and
Optical system, projection generates seven width pure color test charts, and enters computer, and by image procossing, obtain using camera acquisition
The CIE XYZ of test chart become CIE Yxy chromatic values by color space conversion, then by all screens be obtained it is public most
Big hexagon colour gamut carries out consistency adjusting as aim colour angle value to screen color all in DLP large-screen splicing walls；
3rd, brightness point by point compensates, and adjusts the uniformity of screen；It is taken pictures with high-definition camera CCD, photo is carried out at data analysis
Reason obtains the brightness value of M*N pixel in display screen.Then the pixel of brightness minimum in all these pixels is found out,
The brightness of entire screen is corrected on the basis of the pixel, obtains the luminance factor K of each pixel, all the points are
Array is compensated into a MASK table (being known as mask coefficient table), then deposit in file；File is compensated to brightness point by point, by embedding
This file is written in FLASH and save by the online upgrading module for entering formula software, in each booting, embedded software by this
Table copies to and in DDR2 memories, main control software reads this coefficient table and exported again after being multiplied with input image data in real time,
The amendment respectively to each pixel RGB component can be realized, compensated so as to fulfill point-by-point colour brightness；
4th, after carrying out above step, multiple projectors are in colour temperature, colour gamut, in the uniformity and consistency of unit can relatively,
Finally, the relevant adjustment result of acquisition is needed to be written in projector's storage medium.
Using the advantageous effect of above-mentioned technical proposal：Combination color homogeneity and the consistency control based on video camera
Method, by the measuring system being made of more projectors, CCD camera, computer, projection screens, then by computer control
Three colour brightness information on CCD camera acquisition time projection screen processed, and according to these collected three colour brightnesses information, meter
Calculate the color coordinates distribution of secondary colour on screen;By obtained color coordinates distribution, the face of the secondary colour on screen can be analyzed
Whether color is uniform.Mainly solve the problems, such as uniformity and consistency in color management.By color automatic adjustment device, to single
Projection display unit is compensated point by point, is realized the color homogeneity in unit, is dispatched by embedded software colour consistency
Task periodically collects the information of the optical sensor feedback built in each display unit, and information is obtained by Web broadcast
The color data of whole system is got, and makes optimum apjustment to each unit brightness and color parameter automatically, realizes display system
In system between each display unit, the consistency and stability of prolonged picture color and brightness.In holding consistency flow
On the basis of, the scheme for realizing smart brightness mode adjustment has also been devised herein, convenient for system under different luminance patterns
Operation.Arbitrary required brightness ratio can be adjusted to a key, carries out the consistency control of different gray scales.
Description of the drawings
Specific embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is measuring system schematic diagram；
Fig. 2 is color parameter set-up procedure flow chart；
Fig. 3 is colour gamut consistency adjustment flow diagram；
Fig. 4 is projection display unit colour triangle figure；
Fig. 5 is the flow chart compensated point by point.
Specific embodiment
The combination color homogeneity and consistency control method based on video camera as shown in Figs. 1-5, it is characterised in that：
With measuring system, include more projectors, CCD camera, computer, projection screens, the wherein image device of video camera：
2/3 inch 2 of 200,000 pixel 3CCD, per frame image valid pixel：1920 (level) × 1080 (vertical)；The work of measuring system
Flow is:Then it by three colour brightness information on computer control CCD camera acquisition time projection screen, and is adopted according to these
The three colour brightness information collected calculate the color coordinates distribution of secondary colour on screen;Pass through obtained color coordinates distribution, Ke Yifen
Whether the color for analysing the secondary colour on screen is uniform,
According to color displays adjustment technology, the adjustment flow of uniformity and consistency, after measurement starts, projector's timesharing are formulated
The full frame image of output red, green, blue, three colors is thrown on projection screen, and being used as brightness by CCD high-speed cameras detects feedback apparatus
Device takes pictures to projection stitching image, then, photo is passed to control computer by USB, measure the chromaticity coordinates before screen and
Brightness, and carry out the color homogeneity of multi-projector splicing system and consistency analysis processing, finally, the adjustment that processing is obtained
As a result it is write in the flash of projector and is stored by main control software；
Wherein, the adjustment technology that projector color is shown, for each unit that system is spliced, from accounting for for R, G, B
Sky adjusts several respects and adjusts to improve the equal of color displays than adjustment, the adjustment of solid state light emitter electric current, brightness point by point compensation, six-basic-color
Even property so that each unit reaches consistent in various aspects such as the uniformities of colour brightness, and set-up procedure is as follows：
1st, it by adjusting the duty ratio of solid state light emitter electric current, RGB, adjusts colour temperature and white color coordinates, large-screen splicing wall is switched to
White, by adjusting source current value, RGB duty ratios, the coordinate value fed back with video camera is compared and constantly adjusts so that
As a result it is close with target；The purpose that electric current adjustment, duty ratio adjust is so that the colour temperature chromaticity coordinates between each unit is close consistent,
Combination being optimal of brightness of light source；By changing the current value of solid state light emitter, the coordinate value and mesh that measuring system is fed back to
Scale value is compared and constantly adjusts so that result and target are close.The purpose of electric current adjustment is the color so that between each unit
Warm colour coordinate is close to unanimously；Select with aim colour warm colour coordinate closest to a duty ratio as adjustment as a result, completion duty
The selection of ratio；
2nd, six-basic-color is adjusted（RGBCMY）Tone, brightness, saturation degree, the chromaticity coordinates for making each unit is consistent；At projector
The pattern generator that reason device is internally integrated generates red, green, blue, Huang, product, blueness, white seven width pure color test chart, by projector
Signal processing circuit and optical system, projection generates seven width pure color test charts, and enters computer, and pass through using camera acquisition
Image procossing obtains the CIE XYZ of test chart, becomes CIE Yxy chromatic values by color space conversion, then by all screens
The public maximum hexagon colour gamut being obtained carries out screen color all in DLP large-screen splicing walls as aim colour angle value
Consistency is adjusted；
3rd, brightness point by point compensates, and adjusts the uniformity of screen；It is taken pictures with high-definition camera CCD, photo is carried out at data analysis
Reason obtains the brightness value of M*N pixel in display screen.Then the pixel of brightness minimum in all these pixels is found out,
The brightness of entire screen is corrected on the basis of the pixel, obtains the luminance factor K of each pixel, all the points are
Array is compensated into a MASK table (being known as mask coefficient table), then deposit in file；File is compensated to brightness point by point, by embedding
This file is written in FLASH and save by the online upgrading module for entering formula software, in each booting, embedded software by this
Table copies to and in DDR2 memories, main control software reads this coefficient table and exported again after being multiplied with input image data in real time,
The amendment respectively to each pixel RGB component can be realized, compensated so as to fulfill point-by-point colour brightness；
4th, after carrying out above step, multiple projectors are in colour temperature, colour gamut, in the uniformity and consistency of unit can relatively,
Finally, the relevant adjustment result of acquisition is needed to be written in projector's storage medium.
Claims (1)
1. a kind of combination color homogeneity and consistency control method based on video camera, it is characterised in that：It is with measuring
System, includes more projectors, CCD camera, computer, projection screens, the wherein image device of video camera：2/3 inch 2 20
Ten thousand pixel 3CCD, per frame image valid pixel：1920 (level) × 1080 (vertical)；The workflow of measuring system is:Then
By three colour brightness information on computer control CCD camera acquisition time projection screen, and according to these collected three colors
Luminance information calculates the color coordinates distribution of secondary colour on screen;By obtained color coordinates distribution, can analyze on screen
Whether the color of secondary colour is uniform,
According to color displays adjustment technology, the adjustment flow of uniformity and consistency, after measurement starts, projector's timesharing are formulated
The full frame image of output red, green, blue, three colors is thrown on projection screen, and being used as brightness by CCD high-speed cameras detects feedback apparatus
Device takes pictures to projection stitching image, then, photo is passed to control computer by USB, measure the chromaticity coordinates before screen and
Brightness, and carry out the color homogeneity of multi-projector splicing system and consistency analysis processing, finally, the adjustment that processing is obtained
As a result it is write in the flash of projector and is stored by main control software；
Wherein, the adjustment technology that projector color is shown, for each unit that system is spliced, from accounting for for R, G, B
Sky adjusts several respects and adjusts to improve the equal of color displays than adjustment, the adjustment of solid state light emitter electric current, brightness point by point compensation, six-basic-color
Even property so that each unit reaches consistent in various aspects such as the uniformities of colour brightness, and set-up procedure is as follows：
（1）, by adjusting the duty ratio of solid state light emitter electric current, RGB, adjust colour temperature and white color coordinates, large-screen splicing wall switching
For white, by adjusting source current value, RGB duty ratios, the coordinate value fed back with video camera is compared and constantly adjusts, makes
It obtains result and target is close；Electric current adjustment, duty ratio adjustment purpose be so that the colour temperature chromaticity coordinates between each unit is close to one
It causes, combination being optimal of brightness of light source；By changing the current value of solid state light emitter, coordinate value that measuring system is fed back to
Desired value is compared and constantly adjusts so that and result and target are close,
The purpose of electric current adjustment is so that the colour temperature chromaticity coordinates between each unit is close to unanimously；Selection and aim colour warm colour coordinate are most
Close to a duty ratio as adjustment as a result, completing the selection of duty ratio；
（2）, adjustment six-basic-color（RGBCMY）Tone, brightness, saturation degree, the chromaticity coordinates for making each unit is consistent；Pass through projector
The pattern generator that processor is internally integrated generates red, green, blue, Huang, product, blueness, white seven width pure color test chart, by projection
Machine signal processing circuit and optical system, projection generates seven width pure color test charts, and enters computer, and pass through using camera acquisition
Image procossing is crossed, obtains the CIE XYZ of test chart, becomes CIE Yxy chromatic values by color space conversion, then by all screens
The public maximum hexagon colour gamut that curtain is obtained as aim colour angle value, to screen color all in DLP large-screen splicing walls into
Row consistency is adjusted；
（3）, brightness point by point compensation, adjust the uniformity of screen；It is taken pictures with high-definition camera CCD, data analysis is carried out to photo
Processing obtains the brightness value of M*N pixel in display screen,
Then the pixel of brightness minimum in all these pixels is found out, to the brightness of entire screen on the basis of the pixel
It is corrected, obtains the luminance factor K of each pixel, the coefficient of all the points forms a MASK table and (is known as mask coefficient
Table), then in deposit compensation file；File is compensated to brightness point by point, it is by the online upgrading module of embedded software that this is literary
Saved in part write-in FLASH, in each booting, embedded software by this table copy to in DDR2 memories, master control
Software reads this coefficient table and is exported again after being multiplied with input image data in real time, you can realizes to each pixel RGB component
It corrects, is compensated so as to fulfill point-by-point colour brightness respectively；
（4）, carry out above step after, multiple projectors are in colour temperature, colour gamut, can compare in the uniformity and consistency of unit and connect
Closely, finally, the relevant adjustment result of acquisition is needed to be written in projector's storage medium.
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| CN109686336A (en) * | 2019-02-22 | 2019-04-26 | 京东方科技集团股份有限公司 | Display device and display control method and device thereof |
| CN109814827A (en) * | 2019-01-28 | 2019-05-28 | Oppo广东移动通信有限公司 | Display control method and device of equipment, electronic equipment and storage medium |
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| CN110874817A (en) * | 2018-08-29 | 2020-03-10 | 上海商汤智能科技有限公司 | Image stitching method and device, vehicle-mounted image processing device, electronic equipment and storage medium |
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