CN104796679A - Laser display color adjusting method and device thereof - Google Patents

Laser display color adjusting method and device thereof Download PDF

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Publication number
CN104796679A
CN104796679A CN201410029901.3A CN201410029901A CN104796679A CN 104796679 A CN104796679 A CN 104796679A CN 201410029901 A CN201410029901 A CN 201410029901A CN 104796679 A CN104796679 A CN 104796679A
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tone
pixel
signal
mapping
data
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王蔚生
那柏林
王国栋
赵彦君
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Medium Energy Laser Display Technology (shanghai) Co Ltd
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Medium Energy Laser Display Technology (shanghai) Co Ltd
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Abstract

The invention discloses a laser display color adjusting method, which comprises steps: raw data signals in a RGB format of one frame of laser image are acquired; the format of the raw data signals is converted to generate data signals in an L*C*h format; a tone corresponding to a tone range with concentrated pixel points is recorded to be a main tone of the laser image and a main tone influence function is set; a saturation influence function is set, the main tone influence function is introduced at the same time if the main tone exists in the laser image, and saturation mapping is carried out on all pixel points in the data signals; a tone weight function is set to carry out tone mapping on all pixel points in the data signals; a light illumination mapping function is set to carry out light illumination mapping on all pixel points; and the format of the data signals is converted to the RGB format and display is carried out. By adopting different tone, saturation and light illumination mapping relationships, ill questions of over saturation, over illumination, easy visual fatigue and the like can be solved. The invention also discloses a laser display color adjusting device.

Description

A kind of color adjustment method of laser display and device thereof
Technical field
The invention belongs to field of semiconductor lasers, particularly relate to a kind of color adjustment method and device thereof of laser display.
Background technology
Traditional color management refers to the method using soft and hardware to combine, and automatically manages uniformly and adjusts color, to ensure consistency of colour in whole process in production system.Traditional color management method is the mapping from large colour gamut to little colour gamut, comprises colour gamut clipping algorithm and gamut compression algorithm.Colour gamut trimming algorithm: the color within target color gamut is left intact, the color edge color outside target color gamut replaces.Gamut compression algorithm: the effect evenly changing view picture figure, to the pixel in different color gamut space, adopts same or different functions to map.Two kinds of algorithms all can cause different colours in original image, after gamut mapping algorithm, present same color or close to color.
As shown in Figure 8, because LASER Light Source gamut range is far longer than original television standard signal gamut range, be equivalent to 185% of traditional NTSC gamut range, more than 90% of human eye identifiable design color can be reappeared in theory.Again because traditional images signal adopts NTSC gamut range (or other standards mostly, the pal mode that such as gamut range is less) encoding forms, if so directly image is reappeared under laser colour gamut, the visual experience that supersaturation can be brought excessively gorgeous to user, and easily produce visual fatigue.
Summary of the invention
To instant invention overcomes in prior art in the defect of the image of NSTC colour gamut being carried out the image that color adjustment causes supersaturation excessively gorgeous in laser colour gamut, propose a kind of color adjustment method and device thereof of laser display.
The present invention proposes a kind of color adjustment method of laser display, comprises the steps:
Step one: the former data-signal obtaining the rgb format of a frame laser image;
Step 2: the form changing described former data-signal, generates the data-signal of L*C*h form;
Step 3: the distribution of pixel in tone range calculating described data-signal, tone corresponding to the tone range concentrated by pixel is designated as the dominant hue of described laser image and setting essential colour adjusts influence function, otherwise described laser image does not exist dominant hue;
Step 4: described tone range is divided between at least one tone zone, the effect of saturation degree function that in setting at least one tone zone described, pixel maps about saturation, if there is dominant hue in described laser image, then introduce described dominant hue influence function simultaneously, saturation mapping is carried out to pixels all in described data-signal;
Step 5: what set each tone can obtain tone weighting function by mapping range, carries out tone mapping to pixels all in described data-signal;
Step 6: the illuminance value calculating all pixels in described former data-signal, sets the illuminance mapping function of illuminance value in multiple illuminance interval, carries out illuminance mapping to pixels all in described data-signal;
Step 7: be rgb format by the format conversion of described data-signal, and export in laser in order to laser display.
In the color adjustment method of the laser display that the present invention proposes, first the former data-signal of rgb format is converted to the data-signal of XYZ form in described step 2, then the data-signal of described XYZ form is converted to the data-signal of L*C*h form.
In the color adjustment method of the laser display that the present invention proposes, the data-signal of the XYZ form after conversion as following formula table not:
C r C g C b = x r x g x b y r y g y b z r z g z b - 1 x n / y n 1 z n / y n ;
In above formula, C r, C g, C bbe respectively R, the trichromatic coupling component coefficient of G, B, x rrepresent the x-axis coordinate of primary colours r, y rrepresent the y-axis coordinate of primary colours r, z rrepresent the z-axis coordinate of primary colours r, x grepresent the x-axis coordinate of primary colours g, y grepresent the y-axis coordinate of primary colours g, z grepresent the z-axis coordinate of primary colours g, x brepresent the x-axis coordinate of primary colours b, y brepresent the y-axis coordinate of primary colours b, z brepresent the z-axis coordinate of primary colours b, X n, Y n, Z nfor reference illumination body tristimulus values.
In the color adjustment method of the laser display that the present invention proposes, data-signal such as the following formula of the L*C*h form after conversion represents:
L * = 116 f ( Y / Y n ) - 16 a * = 500 [ f ( X / X n ) - f ( Y / Y n ) ] b * = 200 [ f ( Y / Y n ) - f ( Z / Z n ) ] , C * = ( a * ) 2 + ( b * ) 2 h = ( 180 / π ) arctan ( b * / a * ) ,
Wherein, f ( t ) = t 1 / 3 t &GreaterEqual; ( 6 / 29 ) 1 / 3 1 3 ( 29 6 ) 2 t + 16 / 116 t < ( 6 / 29 ) 1 / 3 ;
In above formula, X n, Y n, Z nfor the reference illumination body tristimulus values in laser image, L* represents the illuminance of pixel, and a* and b* represents the opposition dimension of pixel, and C* represents the saturation of pixel, and h represents the tone of pixel, and t is the variable of function f (t).
In the color adjustment method of the laser display that the present invention proposes, in step 3, if the pixel quantity in a gamut range exceed total pixel quantity 30% and average higher than pixel quantity more than 50% in all the other gamut ranges, or the pixel quantity in a gamut range exceedes 50% of total pixel quantity, then the tone corresponding to this gamut range is designated as the dominant hue of laser image.
In the color adjustment method of the laser display that the present invention proposes, in step 4, after degree of supersaturation maps, saturation such as the following formula of pixel represents:
C* 1－C* 0×P(C* 0×h×L*)×I(h)；
In formula, C* 1represent the intensity value of pixel after saturation maps, C* 0represent the pixel intensity value mapped without saturation, P (C* 0× h* × L*) represent that the influence function that the tone of this pixel maps about saturation, I (h) represent the dominant hue influence function that this dominant hue maps about saturation.
In the color adjustment method of the laser display that the present invention proposes, in step 4, after tone mapping, tone such as the following formula of pixel represents:
h 1－h 0×e(h 0)；
In formula, h 1represent the tone value of pixel after tone mapping, h 0represent the pixel tone value without tone mapping, e (h 0) represent tone weighting function.
In the color adjustment method of the laser display that the present invention proposes, relation such as the following formula that in described step 4, illuminance maps represents:
L* 1－L* 0×f(L* 0)；
In formula, L* 1represent the illuminance of the pixel after mapping, L* 0represent the pixel illuminance without mapping, f (L*0) represents illuminance weighting function.
The invention allows for a kind of color adjusting device of laser display, comprising: format conversion apparatus, the former data-signal being used for the rgb format of laser display is converted to the data-signal of L*C*h form by it; Image analysis apparatus, it is for obtaining the dominant hue of the image of laser display; Saturation mapping device, it is connected with described format conversion apparatus and described image analysis apparatus respectively, for carrying out saturation mapping to described data-signal; Tone mapping device, it is connected with described format conversion apparatus and described image analysis apparatus respectively, in order to carry out tone mapping to described data-signal; Illuminance mapping device, it is connected with described format conversion apparatus and described image analysis apparatus respectively, for carrying out tone mapping to described data-signal; Form inverter, it is connected with described saturation mapping device, described tone mapping device and described illuminance mapping device respectively, for the data-signal of L*C*h form being converted to the rgb format data-signal for laser display.
Beneficial effect of the present invention comprises: give full play to the advantage that laser colour gamut is large, rgb format data-signal is converted to the data-signal of L*C*h form, color adjustment is carried out with L*C*h form, and propose a kind of be applicable to this pattern under the mapping relations of different tone, saturation and illuminance, solve the bad problems such as satiety, excessively gorgeous, easy visual fatigue.The invention also achieves the adjustment of real-time dynamic gamut scope, according to picture material, the discovery scope of real-time adjustment colour gamut, to reach dynamic image display, reaches more excellent visual effect.
Accompanying drawing explanation
Fig. 1 is the flow chart of the color adjustment method of laser display of the present invention.
Fig. 2 is the maximum saturation distribution map that different tone is corresponding.
Fig. 3 is the schematic diagram to saturation C* interval division before saturation of the present invention maps.
Fig. 4 is tone mapping figure in tone mapping procedure of the present invention.
Fig. 5 is the schematic diagram of the corresponding relation of Y-component value and image light levels in the present invention.
Fig. 6 is the structural representation of the color adjusting device of laser display of the present invention.
Fig. 7 is that the present embodiment realizes the circuit diagram of function of the present invention by FPGA framework.
Fig. 8 is laser colour gamut and NTSC colour gamut comparison diagram in prior art.
Embodiment
In conjunction with following specific embodiments and the drawings, the present invention is described in further detail.Implement process of the present invention, condition, experimental technique etc., except the following content mentioned specially, be universal knowledege and the common practise of this area, the present invention is not particularly limited content.
Fig. 1 display be the flow chart of the color adjustment method of laser display of the present invention, comprising following steps:
Step one: the former data-signal obtaining the rgb format of a frame laser image.
Step 2: the form changing described former data-signal, generates the data-signal of L*C*h form.
Step 3: the distribution of pixel in tone range calculating described data-signal, tone corresponding to the tone range concentrated by pixel is designated as the dominant hue of described laser image and setting essential colour adjusts influence function, otherwise described laser image does not exist dominant hue.
Step 4: described tone range is divided between at least one tone zone, the effect of saturation degree function that in setting at least one tone zone described, pixel maps about saturation, if there is dominant hue in described laser image, then introduce described dominant hue influence function simultaneously, saturation mapping is carried out to pixels all in described data-signal.
Step 5: what set each tone can obtain tone weighting function by mapping range, carries out tone mapping to pixels all in described data-signal.
Step 6: the illuminance value calculating all pixels in described former data-signal, in setting different light degree interval, the illuminance mapping function of illuminance value, carries out illuminance mapping to pixels all in described data-signal.
Step 7: be rgb format by the format conversion of described data-signal, and export in laser in order to laser display.
The laser image obtained by above-mentioned steps has more excellent visual effect, is described further below for above steps:
That the former data-signal obtaining the laser image of a wherein frame from continuous print laser display image maps in step one.Laser image shows with red light, green light and blue light (that is, photochromic three primary colors), and the form of this former data-signal is corresponding rgb format.Wherein R, G, B represent the data of red light, green light and blue light respectively.
In step 2, the former data-signal of this rgb format is converted to the data-signal of L*C*h form, first convert XYZ form by former data-signal to from rgb format, become L*C*h form by XYZ format conversion again, thus obtain the data-signal of the L*C*h form treating follow-up mapping.Usually, the data-signal of rgb format is as represented with following formula 1:
X＝C rx rR+C gx gG+C bx bB
Y＝C ry rR+C gy gG+C bY bB
Z＝C rz rR+C gz gG+C bz bB；------------------(1)
In formula 1, x rrepresent the x-axis chromaticity coordinate of primary colours r, y rrepresent the y-axis chromaticity coordinate of primary colours r, z rrepresent the z-axis chromaticity coordinate of primary colours r, x grepresent the x-axis chromaticity coordinate of primary colours g, y grepresent the y-axis chromaticity coordinate of primary colours g, z grepresent the z-axis chromaticity coordinate of primary colours g, x brepresent the x-axis chromaticity coordinate of primary colours b, y brepresent the y-axis chromaticity coordinate of primary colours b, z brepresent the z-axis chromaticity coordinate of primary colours b.Under different colour temperature standards, the trichromatic chromaticity coordinate of RGB is not identical, and current standard color temperature has D65, the plurality of specifications such as D50.
Be that former data-signal is converted to the data-signal of XYZ form through following formula 2 by rgb format, formula 2 is as following expression:
C r C g C b = x r x g x b y r y g y b z r z g z b - 1 x n / y n 1 z n / y n ; - - - ( 2 )
In formula 2, C r, C g, C bbe respectively R, the trichromatic coupling component coefficient of G, B, x rrepresent the x-axis coordinate of primary colours r, y rrepresent the y-axis coordinate of primary colours r, z rrepresent the z-axis coordinate of primary colours r, x grepresent the x-axis coordinate of primary colours g, y grepresent the y-axis coordinate of primary colours g, z grepresent the z-axis coordinate of primary colours g, x brepresent the x-axis coordinate of primary colours b, y brepresent the y-axis coordinate of primary colours b, z brepresent the z-axis coordinate of primary colours b, X n, Y n, Z nfor the reference illumination body tristimulus values in image.
Be converted into L*C*h form again after being converted to XYZ form, the data-signal of generation is as represented with following formula 3:
L * = 116 f ( Y / Y n ) - 16 a * = 500 [ f ( X / X n ) - f ( Y / Y n ) ] b * = 200 [ f ( Y / Y n ) - f ( Z / Z n ) ] , C * = ( a * ) 2 + ( b * ) 2 h = ( 180 / &pi; ) arctan ( b * / a * ) ,
Wherein, f ( t ) = t 1 / 3 t &GreaterEqual; ( 6 / 29 ) 1 / 3 1 3 ( 29 6 ) 2 t + 16 / 116 t < ( 6 / 29 ) 1 / 3 ; - - - ( 3 )
In above formula 3, X n, Y n, Z nfor the reference illumination body tristimulus values in laser image, L* represents the illuminance of pixel, and a* and b* represents the opposition dimension of pixel, and C* represents the saturation of pixel, and h represents the tone of pixel, and t is the variable of function f (t).
Comprise the data about saturation C*, illuminance L* and tone h in the data-signal of L*C*h form obtained above, thus realize the color adjustment of laser image by changing these data.
First in step 3, analyze the dominant hue of the laser image corresponding to this data-signal.The tone range of pixel is from 0 to 360, first the distribution of pixel in whole gamut range of calculated data signal.If the pixel quantity in a gamut range exceed total pixel quantity 30% and average higher than pixel quantity more than 50% in all the other gamut ranges, or the pixel quantity in a gamut range exceedes 50% of total pixel quantity, then the tone corresponding to this gamut range is designated as the dominant hue of laser image
Why the present invention judges the dominant hue of this laser image, be because when dominant hue and other colors produce identical saturation change time, its visual experience for user is different.Such as, when the mass-tone of image is adjusted to A, so the sight equation opposite sex of user to A color is lower, and that is when identical saturation change occurs for A color and other colors, difference visual experience is different, and it is less that user thinks that A color changes.With when should need to meet identical vision difference change, the excursion that A color needs is less.When the mass-tone of image is adjusted to A, so the sight equation opposite sex of user to B color is higher, also just says that difference visual experience is different, and it is more that user thinks that B color changes when identical saturation change occurs for B color and other colors.With when should need to meet identical vision difference change, the excursion that B color needs is larger.
When being judged to there is obvious dominant hue in this laser image by above-mentioned steps, the pixel quantity corresponding to dominant hue obviously will be greater than other tone pixel quantity, and in tonal analysis figure, violent regional change occurs.But when rich color in image, there is not dominant hue, the pixel quantity corresponding to each tone is average, there is not violent regional change in tonal analysis figure.Adjust influence function by setting essential colour, thus realize the effect of above-mentioned saturation mapping.
Because the pixel of different colours has different maximum saturations under laser display, the scope of shade of color h that what in Fig. 2, abscissa represented is from 0 to 360, the scope of what ordinate represented the is saturation C* of color.The saturation of the six kinds of colors identified in figure, is followed successively by redness, yellow, green, cyan, blueness and magenta from left to right, and wherein the saturation C* of blue (the left several 5th) is maximum, and the intermediate color saturation C* between green and blueness is minimum.So in mapping relations formula, the affecting parameters of saturation C* just can not change according to fixing threshold value, and saturation C* change that will be corresponding different according to different tone h.
So step 4 is being carried out in saturation mapping process to data-signal, the mapping curve of different colours is just being revised and is generating effect of saturation degree function.As shown in Figure 3 saturation scope is turned to and be classified as four intervals, be respectively C0, C1, C2, C3.Wherein the saturation in C0 interval is minimum, and the saturation in C3 interval is the highest.According to the difference of saturation C*, simultaneously different according to corresponding tone h, apply different Mapping standard.At the pixel in minimum saturation C0 interval, tone performance generally all presents ambiguous state, because their saturation C* is very low, the pixel of the white of closely reference.If amplify the saturation C* of the interval pixel of this C0, can serve to picture strip and non-existent color, and very serious impact can be brought on picture contrast.So treat the pixel in this interval, keep its saturation C* size constant as much as possible, or moderately reduce the saturation C* of this interval pixel.For the pixel being in C3 interval, because its saturation C* is very large, iff the saturation C* amplifying this interval pixel simply, the bad visual effect of " cloud mud " can be brought to image.So take the mapping rule reduced for the saturation C* of the pixel in this interval, meet the normal vision requirement of human eye.For the pixel being in C1 and C2 interval, intensified image vegetarian refreshments saturation C* that can be suitable.By said method, obtain the mapping parameters of pixel within the scope of different saturation, obtain effect of saturation degree function.
Therefore, carry out saturation mapping in conjunction with above-mentioned effect of saturation degree function and mass-tone influence function to data-signal, the saturation C* mapped through degree of supersaturation is shown below:
C* 1＝C* 0×P(C* 0×h×L*)×I(h)；------------------------(4)
In formula 4, C* 1represent the intensity value of pixel after saturation maps, C* 0represent the pixel intensity value mapped without saturation, P (C* 0× h* × L*) represent that the influence function that the tone of this pixel maps about saturation, I (h) represent the dominant hue influence function that this dominant hue maps about saturation.
What set each tone in step 5 can obtain tone weighting function by mapping range, carries out tone mapping to pixels all in described data-signal.Such as, in Fig. 4, if pixel A is the pixel needing to map, A point and the line in the great circle center of circle and the angle of transverse axis are the tone h of this pixel.Taking A as the small circular region in the center of circle, is namely the region that pixel A can map.The diameter of this mapping area, determine according to different aberration, aberration more major diameter is also larger, otherwise less
But in actual mapping process, be not that all pixels in this small circular all can be mapped to, because the straight line of different pixels point and great circle center of circle composition, different from the angle of transverse axis, namely different pixels point has different tones.And in tone mapping procedure, the tone of color is should be not reformed, but can appropriately must strengthen.Such as pixel A (supposing that this pixel is for red), by Mapping standard before, it can be mapped to pixel A ' and pixel A respectively ".But relative to pixel A ", pixel A ' seems more yellow, and pixel A " redder.So according to tone mapping criterion, pixel A should be mapped to pixel A ", instead of pixel A '.Obtain tone weighting function thus, completed the process of above-mentioned tone mapping by this weighting function.
After above-mentioned tone mapping process, the tone of pixel is shown below:
h 1＝h 0×e(h 0)；------------------------------(5)
In formula 5, h 1represent the tone value of pixel after tone mapping, h 0represent the pixel tone value without tone mapping, e (h 0) represent tone weighting function.
In step 6, illuminance mapping is carried out to color, realize keeping or improve image light illumination contrast, superior visual experience can be brought to user.Table 1 shows the contrast situation of Y-component under the same color space under different colour gamut.
The contrast table of Y-component under same color space under the different colour gamut of table 1
Comparative analysis is done according to the pixel in table 1, two groups of data are respectively at NTSC (National Television SystemCommittee, NTSC) and laser (Laser) colour gamut under there is identical L*, C*, the pixel of h component, at the component value of rgb color space, with at the component value of yuv space illuminance Y.
By the analysis of his-and-hers watches 1, can find out after common Color Gamut Mapping, the illuminance Y-component of pixel creates change, and this change is not confirmable, therefore have impact on the illuminance contrast of the rear image of colour gamut management.The illuminance of rgb color space image is as represented with following formula 5:
Y＝0.299*R+0.587*G+0.114*B：------------(6)
In formula 6, Y represents illuminance Y-component, and R represents red color component value, and G represents green component values, and B represents blue color component value.
This step s5 not only will keep original bright dark relativity, also will increase picture contrast as much as possible, also just makes original bright image vegetarian refreshments brighter, and dark pixel point is darker, so further optimize mapping according to the difference of Y.Fig. 5 display be the corresponding relation of Y-component value and image light levels, it is secretly bright that Y-component is used for the vision of definition actual pixels point, and Y-component is larger, shows that this pixel vision is brighter, otherwise then darker.
Suppose that all pixels are under rgb color space performance, the interval of RGB tri-components is all from 0 to 255, and so the interval of Y-component is also from 0 to 255.So when the Y-component of certain pixel is less than 64, assert that this pixel is visually dark pixel point, when the Y-component of certain pixel is greater than 192, assert that this pixel is visually bright image vegetarian refreshments, when being in 64 to 192 and being interval, is normal pixel point.Therefore take to optimize and map, make dark pixel darker, and bright pixel is brighter.
When keeping L*C*h tri-components identical, under NTSC and LASER gamut range, the value of RGB tri-components is different, varying in size of Y-component can be drawn according to formula (5), so pixel A and pixel B illuminance contrast after saturation with tone mapping may be caused different (namely, map preceding pixel point A higher than pixel B illuminance, after mapping, pixel A is lower than pixel B illuminance), the illuminance contrast of integral image can be affected, therefore the present invention sets different illuminance weighting functions and carries out illuminance mapping, not only keep the equiconsistency of original image illuminance contrast, the correction of the illuminance contrast that may have influence on after saturation is mapped, and improve the illuminance contrast of image further.
In step 6, the illuminance first belonging to pixel illuminance is interval, does different changes.Such as: when the Y-component of pixel is less than 64, illuminance mapping can be carried out according to following formula:
Y 1 = A 0 - A 0 2 - Y 0 2 ; - - - ( 7 )
In formula 7, Y 1for mapping the illuminance of rear pixel, Y 0for mapping the illuminance of preceding pixel point.Illuminance Y after mapping 1be less than Y 0, A 0for illuminance line of demarcation, be less than A 0be identified as low irradiance pixel.
When the Y-component of pixel is greater than 192, illuminance mapping can be carried out according to following formula:
Y 1 = A 1 + ( 255 - A 1 ) 2 - ( Y 0 - 255 ) 2 ; - - - ( 8 )
In formula 8, Y 1for mapping the illuminance of rear pixel, Y 0for mapping the illuminance of preceding pixel point.Illuminance Y after mapping 1be greater than Y 0, A 1for illuminance line of demarcation, be greater than A 1be identified as high illuminance pixel.Y and L is the component in different color space representation illuminance.
The illuminance of all the other normal light illumination pixels is not made and is changed, and this kind of pixel illuminance is at A 0and A 1between, wherein A 1be greater than A 0.
After completing the mapping of above-mentioned saturation, tone and illuminance, namely the color completed for laser image adjusts, step 7 converts the data-signal of L*C*h form the data-signal of XYZ form to, convert the data-signal of rgb format again to, the formula of its inverse transformation process is with reference to step one, thus the data-signal of L*C*h form after being adjusted by color is converted to the data-signal for the rgb format of laser display and exports in laser and shows.
Fig. 6 display be the structural representation of the color adjusting device of laser display of the present invention, it mainly comprises: format conversion apparatus 1, and the former data-signal being used for the rgb format of laser display is converted to the data-signal of L*C*h form by it; Image analysis apparatus 2, it is for obtaining the dominant hue of the image of laser display; Saturation mapping device 3, it is connected with described format conversion apparatus 1 and described image analysis apparatus 2 respectively, for carrying out saturation mapping to described data-signal; Tone mapping device 4, it is connected with described format conversion apparatus 1 and described image analysis apparatus 2 respectively, in order to carry out tone mapping to described data-signal; Illuminance mapping device 5, it is connected with described format conversion apparatus 1 and described image analysis apparatus 2 respectively, for carrying out tone mapping to described data-signal; Form inverter 6, it is connected with described saturation mapping device 3, described tone mapping device 4 and described illuminance mapping device 5 respectively, for the data-signal of L*C*h form being converted to the rgb format data-signal for laser display.The FPGA framework of the color adjusting device of laser display of the present invention as shown in Figure 7.
Protection content of the present invention is not limited to above embodiment.Under the spirit and scope not deviating from inventive concept, the change that those skilled in the art can expect and advantage are all included in the present invention, and are protection range with appending claims.

Claims (9)

1. a color adjustment method for laser display, is characterized in that, comprises the steps:
Step one: the former data-signal obtaining the rgb format of a frame laser image;
Step 2: the form changing described former data-signal, generates the data-signal of L*C*h form;
Step 3: the distribution of pixel in tone range calculating described data-signal, tone corresponding to the tone range concentrated by pixel is designated as the dominant hue of described laser image and setting essential colour adjusts influence function, otherwise described laser image does not exist dominant hue;
Step 4: described tone range is divided between at least one tone zone, the effect of saturation degree function that in setting at least one tone zone described, pixel maps about saturation, if there is dominant hue in described laser image, then introduce described dominant hue influence function simultaneously, saturation mapping is carried out to pixels all in described data-signal;
Step 5: what set each tone can obtain tone weighting function by mapping range, carries out tone mapping to pixels all in described data-signal;
Step 6: the illuminance value calculating all pixels in described former data-signal, sets the illuminance mapping function of illuminance value in multiple illuminance interval, carries out illuminance mapping to pixels all in described data-signal;
Step 7: be rgb format by the format conversion of described data-signal, and export in laser in order to laser display.
2. the color adjustment method of laser display as described in claim 1, it is characterized in that, first the former data-signal of rgb format is converted to the data-signal of XYZ form in described step 2, then the data-signal of described XYZ form is converted to the data-signal of L*C*h form.
3. the color adjustment method of laser display as described in claim 2, it is characterized in that, data-signal such as the following formula of the XYZ form after conversion represents:
C r C g C b = x r x g x b y r y g y b z r z g z b - 1 x n / y n 1 z n / y n ;
In above formula, C r, C g, C bbe respectively R, the trichromatic coupling component coefficient of G, B, x rrepresent the x-axis coordinate of primary colours r, y rrepresent the y-axis coordinate of primary colours r, z rrepresent the z-axis coordinate of primary colours r, x grepresent the x-axis coordinate of primary colours g, y grepresent the y-axis coordinate of primary colours g, z grepresent the z-axis coordinate of primary colours g, x brepresent the x-axis coordinate of primary colours b, y brepresent the y-axis coordinate of primary colours b, z brepresent the z-axis coordinate of primary colours b, X n, Y n, Z nfor reference illumination body tristimulus values.
4. the color adjustment method of laser display as described in claim 2, it is characterized in that, data-signal such as the following formula of the L*C*h form after conversion represents:
L * = 116 f ( Y / Y n ) - 16 a * = 500 [ f ( X / X n ) - f ( Y / Y n ) ] b * = 200 [ f ( Y / Y n ) - f ( Z / Z n ) ] , C * = ( a * ) 2 + ( b * ) 2 h = ( 180 / &pi; ) arctan ( b * / a * ) ,
Wherein, f ( t ) = t 1 / 3 t &GreaterEqual; ( 6 / 29 ) 1 / 3 1 3 ( 29 6 ) 2 t + 16 / 116 t < ( 6 / 29 ) 1 / 3 ;
In above formula, X n, Y n, Z nfor the reference illumination body tristimulus values in laser image, L* represents the illuminance of pixel, and a* and b* represents the opposition dimension of pixel, and C* represents the saturation of pixel, and h represents the tone of pixel, and t is the variable of function f (t).
5. the color adjustment method of laser display as described in claim 1, it is characterized in that, in step 3, if the pixel quantity in a gamut range exceed total pixel quantity 30% and average higher than pixel quantity more than 50% in all the other gamut ranges, or the pixel quantity in a gamut range exceedes 50% of total pixel quantity, then the tone corresponding to this gamut range is designated as the dominant hue of laser image.
6. the color adjustment method of laser display as described in claim 1, is characterized in that, in step 4, after degree of supersaturation maps, saturation such as the following formula of pixel represents:
C* 1－C* 0×P(C* 0×h×L*)×I(h)；
In formula, C* 1represent the intensity value of pixel after saturation maps, C* 0represent the pixel intensity value mapped without saturation, P (C* 0× h* × L*) represent that the influence function that the tone of this pixel maps about saturation, I (h) represent the dominant hue influence function that this dominant hue maps about saturation.
7. the color adjustment method of laser display as described in claim 1, it is characterized in that, in step 5, after tone mapping, tone such as the following formula of pixel represents:
h 1－h 0×e(h 0)；
In formula, h 1represent the tone value of pixel after tone mapping, h 0represent the pixel tone value without tone mapping, e (h 0) represent tone weighting function.
8. as required the color adjustment method of the laser display described in 1, it is characterized in that, relation such as the following formula that in described step 6, illuminance maps represents:
L* 1－L* 0×f(L* 0)；
In formula, L* 1represent the illuminance of the pixel after mapping, L* 0represent the pixel illuminance without mapping, f (L*0) represents illuminance weighting function.
9. a color adjusting device for laser display, is characterized in that, comprising:
Format conversion apparatus (1), the former data-signal being used for the rgb format of laser display is converted to the data-signal of L*C*h form by it;
Image analysis apparatus (2), it is for obtaining the dominant hue of the image of laser display;
Saturation mapping device (3), it is connected with described format conversion apparatus (1) and described image analysis apparatus (2) respectively, for carrying out saturation mapping to described data-signal;
Tone mapping device (4), it is connected with described format conversion apparatus (1) and described image analysis apparatus (2) respectively, in order to carry out tone mapping to described data-signal;
Illuminance mapping device (5), it is connected with described format conversion apparatus (1) and described image analysis apparatus (2) respectively, for carrying out tone mapping to described data-signal;
Form inverter (6), it is connected with described saturation mapping device (3), described tone mapping device (4) and described illuminance mapping device (5) respectively, for the data-signal of L*C*h form being converted to the rgb format data-signal for laser display.
CN201410029901.3A 2014-01-22 2014-01-22 Laser display color adjusting method and device thereof Pending CN104796679A (en)

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