CN201398224Y - Color gamut conversion system for laser television display based on experiment calibration method - Google Patents
Color gamut conversion system for laser television display based on experiment calibration method Download PDFInfo
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- CN201398224Y CN201398224Y CN2009200210748U CN200920021074U CN201398224Y CN 201398224 Y CN201398224 Y CN 201398224Y CN 2009200210748 U CN2009200210748 U CN 2009200210748U CN 200920021074 U CN200920021074 U CN 200920021074U CN 201398224 Y CN201398224 Y CN 201398224Y
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- color gamut
- color
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- laser television
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Abstract
The utility model discloses a color gamut conversion system for laser television display based on an experiment calibration method, which can realize the perfect conversion from a GRT fluorescence color gamut to a laser display color gamut, and has small calculation amount. The utility model has a structure that the color gamut conversion system comprises a video input device, a color lab space conversion device, a CRT calibration device, a color gamut matching device, a virtual color gamut expansion device and a video output device, wherein the color lab space conversion device converts RGB signals to a sensory linear Lab space; the CRT calibration device gives a stimulus valve RcGcBc of the GRT, and finds out the tristimulus values R1G1B1 of the laser display corresponding to the stimulus valve RcGcBc by an experiment method through self study; the color gamut matching device makes the laser display for receiving the fluorescence powder trichromatic signals obtain correct color reappearance; the virtual color gamut expansion device expands a fluorescence powder trichromatic small color gamut into a laser trichromatic large color gamut; and the video output device displays the converted video data on a screen through a laser television imaging system.
Description
Technical field
The utility model belongs to the laser television field of video displaying, particularly a kind of gamut conversion system that shows based on the laser television of experimental calibration method that the fluorescent material three primary colors is carried out color gamut conversion in laser display to the laser three primary colors.
Background technology
Because the support of correlation techniques such as microelectric technique and processing, laser television develops rapidly.Laser television is in bright gay color with it, brightness is high and colour gamut is wide, and advantages such as high saturation colour coloured silk have vast potential for future development.Yet because existing TV signal all is based on the CRT display system, the color of CRT shows and is based on the RGB three-color phosphor, and the display system of laser television adopts RGB three look laser, and the spectrum difference of the chromatogram of laser and fluorescent material is very big.According to the colorimetry basic principle, in the ligulate zone, appoint the colour get 3 correspondences as primary colours, then to be included in these 3 be in the triangle on summit to the institute's chromatic colour that is mixed by these three primary colors.Thereby there is very big difference in the fluorescent display system of laser television display system and existing CRT on colour gamut, must just can show normally through transforming.
The color gamut conversion scheme that exists is set up the tristimulus values R of CRT exactly mostly based on the color standardization of pure colorimetric in the CEIXYZ space at present
cG
cB
cTristimulus values R with laser television
1G
1B
1Between one-to-one relationship.That is to say, by this platform of CEIXYZ space, the transformation model on theorizing, this model can be at the values R of given CRT
cG
cB
c, find the tristimulus values R of corresponding LD with it
1G
1B
1, the color that makes both show is in full accord in theory.Regrettably, this space is that sense organ is nonlinear, and promptly they can not predict color according to relative position.This has just illustrated that be non-linear through the theoretical conclusion that draws on the sense organ and between the calculated value, thereby, make that the image before and after the mapping has had certain chromaticity distortion.The processing of the coloured image that the image after the above-mentioned conversion of process also will be correlated with just can be revised, thereby has increased the signal processing difficulty virtually, and has also brought difficulty for the realization of hardware.And be the equidimensional ideal state of supposition display based on the color standardization of pure colorimetric, as: when input voltage changes, it is constant to produce chromaticity coordinates separately by each rifle of RGB, each rifle of RGB acts on respectively on each self-corresponding phosphorus powder, be independent of each other each other, do not rely on the input of other positions in the light output of given position, each rifle of RGB responds not time to time change to a constant input, the response of RGB passage is independent of screen position or the like, and often display also not exclusively satisfies these hypothesis, the chromaticity coordinates that sometimes is far longer than the distinguishable aberration correspondence of human eye changes, therefore the precision that quantitatively develops the color with them will be subjected to theoretical model hypothesis restriction and can be too not high.
The utility model content
The utility model is the defective that overcomes prior art, and a kind of gamut conversion system that shows based on the laser television of experimental calibration method is provided, and it can realize the perfection conversion of CRT fluorescence colour gamut to the laser display colour gamut, and amount of calculation is little.
For achieving the above object, the utility model adopts following technical scheme:
The gamut conversion system that a kind of laser television based on the experimental calibration method shows, it comprises caliberating device, colour gamut coalignment, virtual colour gamut expanding unit and the video output device of the video input device that connects successively, color lab spatial alternation device, CRT; Wherein video input device provides video interface, and the vision signal of importing all is converted to the digital rgb signal; Color lab spatial alternation device is converted to the Lab signal to rgb signal.
The video interface of described video input device is at least a in CVBS composite analog video signal interface, Y/C S terminal signals interface, VGA Video Graphics Array signal video frequency interface, DVI digital visual interface and the HDMI HDMI (High Definition Multimedia Interface).
The caliberating device of described CRT comprises computer, computer output two-way rgb signal, and one road rgb signal is directly sent into the laser television display screen; Another road rgb signal is then by sending into CRT monitor behind D/A converter, the γ correction module; Spectrophotometer then carries out the RGB test to CRT monitor and laser television display screen, and the Lab information that produces is sent into computer.
The values R of the given CRT of caliberating device of the utility model CRT
cG
cB
c, find the tristimulus values R of corresponding laser display with it by self study with the method for experiment
1G
1B
1, the color that makes both show is in full accord in theory.The colour gamut coalignment carries out the mapping of colour gamut based on searching algorithm fast, makes the laser display that receives the fluorescent material tristimulus signals obtain correct color reproduction, reaches the purpose of the correct reduction of color.Virtual colour gamut expanding unit stretches in proportion in virtual colour gamut, thereby is the big colour gamuts of laser three primary colors with the trichromatic little gamut extension of fluorescent material, realizes the higher color of saturation in the laser colour gamut beyond the fluorescent material colour gamut.Adopted self-learning method based on experiment to carry out colour gamut when it is characterized in that color gamut conversion and demarcated, and to demarcate be to carry out in the CIEL*a*b* space, Lab colour model colour gamut broad and also it remedied the deficiency of rgb color model COLOR COMPOSITION THROUGH DISTRIBUTION inequality.
The caliberating device of CRT, promptly the hardware of experimental calibration method is:
The CRT monitor of color calibration adopts the CRT monitor that meets the EBU standard, will be as the models show screen of color calibration.
The correction coefficient module adopts the government broadcasting standard; γ=2.3.
Carry out data acquisition according to the CIE standard, the test of CRT monitor, laser television display screen nominal data is carried out in the darkroom, and CRT monitor is carried out the 12h preheating according to the CIE regulation before the test.
The CRT monitor parameter is set to:
CRT monitor brightness: 64.24cd/m2 (rgb value of three passages (0-255) is at 255 o'clock)
LD display brightness: 80cd/m2 (rgb value of three passages (0-255) is at 255 o'clock)
White of CRT monitor: x=0.3127, y=0.3290 (D65)
White of LD display: x=0.2824, y=0.2774 (D65)
Display color side-play amount: 0
Spectrophotometric parameter is set to:
Visual angle: 1 °
Wave-length coverage: 370-730nm
The color gamut of CRT monitor, laser television display screen is sampled by the mode of CIE regulation, with display center, the concentric length of side is that the square of 9cm is a test zone.Keeping beyond the indicator screen test zone is black background.
Data acquisition is as follows: computer from 0 to 255 changes the three-channel data value of test zone RGB successively, and what send accordingly is the true color of 24bit.For CRT monitor, the colour information of this 24bit through directly driving RGB three rifles of CRT monitor behind D/A digital-to-analogue conversion, the gamma transformation, produces corresponding color.And the spectrophotometric determination test zone is measured the L of each group rgb value correspondence, a, and the b chromatic value, and send into computer.Computer record is also stored these L, a, b chromatic value and the numerical value of the 24bit of correspondence with it.
For the laser television display screen, whole process and CRT are similar, and only the color digital information of the RGB three primary colors 24bit that sends of computer is sent into the numeral mouthful of drive circuit, finish control to liquid crystal board by this drive circuit, thereby produce corresponding color.Need only a given RGB three primary colors binary system driving data like this, just can find a L who matches, a, the b value has also just found L therewith simultaneously, a, the data value of the RGB24bit of the driving LD of b value coupling.
Set up database by study like this, utilized then and just search fast and can find the tristimulus values R of corresponding with it laser television display screen at the values RcGcBc of given CRT monitor
LG
LB
L, just can show on the laser television display with CRT monitor on the same color that shows, and the Color Range of demonstration is also consistent with CRT.Above whole process is exactly the color that shows from the CRT monitor calibration process to the color of laser television display screen in fact, has also finished the process that colour gamut is mated simultaneously.
After this colour gamut matching relationship was set up, the vision signal of common CRT reality can correspondingly convert the signal of telecommunication of laser to, thereby realized the correct reproduction of color, i.e. color rendition.Though it is consistent that above colour gamut coupling can guarantee that both colours show, but the advantage that can not show the big colour gamut of laser display, high saturation color, therefore, the utility model has increased the method that virtual color expansion partly realizes being extended to by the little colour gamut of fluorescent material three primary colors the big colour gamut of laser display again.Concrete grammar is as follows:
The existing standard signal that reception is come is converted to laser RGB standard, searches out the white central point in the gamut map, and the laser color standard after the conversion is handled, and calculates color tristimulus values R
LB
LG
LWith the centre distance of white point, according to proportional stretching of distance, whole colors of fluorescence colour gamut all evenly are transformed in the corresponding laser colour gamut then.
The beneficial effects of the utility model are: operand is little, and display effect is good, can realize the perfection conversion of CRT fluorescence colour gamut to the laser display colour gamut
Description of drawings
Fig. 1 is the composition frame chart of the utility model scheme;
Fig. 2 is the hardware architecture figure of the utility model experimental calibration method.
Wherein: 1. video input device, 2. color lab spatial alternation device, the caliberating device of 3.CRT, 4. colour gamut coalignment, 5. virtual colour gamut expanding unit, 6. video output device, 7. laser television display screen, 8. spectrophotometer, 9. computer, 10.CRT display, 11. γ correction modules, 12.D/A transducer, 13. video output devices.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, it comprises 6 six the part compositions of video input device 1, color lab spatial alternation device 2, the caliberating device 3 of CRT, colour gamut coalignment 4, virtual colour gamut expanding unit 5, video output device that connect successively.
Wherein video input device 1 provides various video interfaces, comprise at least a among traditional CVBS (composite analog video signal) interface, Y/C (S terminal signals) interface, VGA (Video Graphics Array signal) video interface, DVI (digital visual interface) and the HDMI (HDMI (High Definition Multimedia Interface)), and the vision signal of input all is converted to the digital rgb signal.
Color lab spatial alternation device 2 is convenient to carry out color conversion to the Lab space of RGB data transaction to the sense organ linearity between distinct device.
The caliberating device 3 of CRT and colour gamut coalignment 4 are as Fig. 2, and computer 9 from 0 to 255 changes the three-channel data value of test zone RGB successively, and what send accordingly is the true color of 24bit.For CRT monitor 10, the colour information of this 24bit through directly driving RGB three rifles of CRT after D/ A converter 12,11 conversion of γ correction module, produces corresponding color.And spectrophotometer 8 is measured the L that test zone is measured each group rgb value correspondence, a, and the b chromatic value, and send into computer 9.Computer 9 record is also stored these L, a, b chromatic value and the numerical value of the 24bit of correspondence with it.For laser television display screen 7, whole process and CRT are similar, only the color digital information of the RGB three primary colors 24bit that sends of computer 9 is sent into the numeral mouthful of drive circuit, finishes control to liquid crystal board by this drive circuit, thereby produces corresponding color.The utility model adopts high accuracy spectrophotometer 8 to test CRT monitor 10 and the L of laser television display screen 7 in whole RGB tristimulus values domain value range respectively, a, the value of b, set up the data corresponding relation between the tristimulus values RBG that inputs to CRT monitor 10 and laser television display screen 7 respectively of identical " L; a, b " value then.Use many " data to " to set up a three dimensional lookup table then.Through this process, CRT monitor 10 and laser television display screen 7 these two kinds of displays have just been finished colourity demarcation and colour gamut coupling.
Virtual colour gamut expanding unit 5 says that by processor digital rgb is transformed into the XYZ color gamut space, search out the white central point in the gamut map, laser color standard after the conversion is handled, calculate the centre distance of color tristimulus values and white point, according to proportional stretching of distance, whole colors of fluorescence colour gamut all evenly are transformed in the corresponding laser colour gamut then.
Claims (3)
1. gamut conversion system that shows based on the laser television of experimental calibration method, it is characterized in that it comprises successively caliberating device, colour gamut coalignment, virtual colour gamut expanding unit and the video output device of the video input device that connects, color lab spatial alternation device, CRT; Wherein video input device provides video interface, and the vision signal of importing all is converted to the digital rgb signal; Color lab spatial alternation device is converted to the Lab signal to rgb signal.
2. the gamut conversion system that shows based on the laser television of experimental calibration method as claimed in claim 1, it is characterized in that the video interface of described video input device is at least a in CVBS composite analog video signal interface, Y/C S terminal signals interface, VGA Video Graphics Array signal video frequency interface, DVI digital visual interface and the HDMI HDMI (High Definition Multimedia Interface).
3. the gamut conversion system that shows based on the laser television of experimental calibration method as claimed in claim 1 is characterized in that the caliberating device of described CRT comprises computer, computer output two-way rgb signal, and one road rgb signal is directly sent into the laser television display screen; Another road rgb signal is then by sending into CRT monitor behind D/A converter, the γ correction module; Spectrophotometer then carries out the RGB test to CRT monitor and laser television display screen, and the Lab information that produces is sent into computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200210748U CN201398224Y (en) | 2009-04-17 | 2009-04-17 | Color gamut conversion system for laser television display based on experiment calibration method |
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|---|---|---|---|
| CN2009200210748U CN201398224Y (en) | 2009-04-17 | 2009-04-17 | Color gamut conversion system for laser television display based on experiment calibration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986715A (en) * | 2010-12-14 | 2011-03-16 | 山东大学 | System and method of expanding laser TV color gamut |
| CN102149004A (en) * | 2011-03-28 | 2011-08-10 | 天津师范大学 | Three-dimensional color gamut digital television test graph template and manufacturing method thereof |
-
2009
- 2009-04-17 CN CN2009200210748U patent/CN201398224Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986715A (en) * | 2010-12-14 | 2011-03-16 | 山东大学 | System and method of expanding laser TV color gamut |
| CN102149004A (en) * | 2011-03-28 | 2011-08-10 | 天津师范大学 | Three-dimensional color gamut digital television test graph template and manufacturing method thereof |
| CN102149004B (en) * | 2011-03-28 | 2013-01-23 | 天津师范大学 | Three-dimensional color gamut digital television test graph template and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100203 Termination date: 20100417 |