CN101621700A - Color gamut matching method for multimedia device and TV - Google Patents
Color gamut matching method for multimedia device and TV Download PDFInfo
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Abstract
The invention discloses a color gamut matching method for a multimedia device, comprising the following steps: a video signal received by the multimedia device is subjected to color gamut mapping and is output, the color gamut where the video signal is located is a first color gamut, and a display color gamut of the multimedia device is a second color gamut; the color gamut matching method for the multimedia device comprises the following steps: the received video signal is converted into a brightness signal and a chromaticity signal, a two-dimensional face is obtained by calculation according to the brightness signal and the chromaticity signal, a first domain is obtained by the tangency of the two-dimensional face and the first color gamut, and a second domain is obtained by the tangency of the two-dimensional face and the second color gamut; the position of a to-be-matched point of the video signal in the first domain is obtained by calculation according to the brightness signal and the chromaticity signal of the video signal, the to-be-matched point is calculated to obtain a matching point in the second domain, and a matching point signal is output.
Description
Technical field
The present invention relates to vision signal and show process field, relate in particular to a kind of color gamut matching method of multimedia equipment and use the television set of described color gamut matching method.
Background technology
Show the field in vision signal at present, because it is different to make the equipment of the video source device of video image and reception displaying video image, two kinds of equipment is discrepant to the Show Color of video image.So just need a kind of color management system to make same width of cloth image on different displays, can demonstrate identical color effect, realize the consistency of color.This color management system is main to carry out match colors to the vision signal that receives exactly, and it comprises color space conversion and colour gamut coupling.
The color space conversion is exactly that the color conversion that a certain color space is represented is represented to another kind of color space.Mutual conversion as color spaces such as RGB, CMYK, CIELAB.The colour gamut coupling is exactly that video equipment mates the vision signal that receives, and obtains the vision signal of correct color rendering.
Mostly use at print field about the technology of color space conversion and colour gamut coupling at present, in field of video displaying, the display unit drive circuit of multimedia device (as display, television set, digital camera, digital code camera etc.) is generally the rgb signal drive circuit, and the rgb color signal that multimedia device sends drive circuit carries out after the color adjustment and then be sent to display unit showing.Mainly comprise the colour gamut matching treatment in concrete color adjustment.Concrete colour gamut matching process is: the whole tone difference correspondence table of independent tone, the saturated coupling correspondence table of masstone, multilayer brightness transition correspondence table etc. are set, then according to demand respectively or carry out the colour gamut coupling of optimal colors characteristic simultaneously.The user watches or measures adjustment pattern on the display unit with the input adjusted value, then adjusted value and institute is set up the correspondence table of getting well and carries out correspondingly one by one, reaches that colour gamut is mated and the adjustment effect of independent look.
In as Chinese patent CN200610136648.7, can also find more information relevant with technique scheme.
But in above scheme, this color adjustment is not only calculated coarse when specific implementation, and still there is the situation of distortion in adjusted image quality.
Summary of the invention
An object of the present invention is to provide a kind of color gamut matching method and television set of multimedia equipment, a kind of image output of high-quality can be provided.
For addressing the above problem, the present invention is by the following technical solutions: first aspect, the invention provides a kind of color gamut matching method of multimedia equipment, the vision signal that described multimedia equipment receives is carried out colour gamut coupling and output, the colour gamut at described vision signal place is first colour gamut, the display light colour gamut of described multimedia equipment is second colour gamut, its special character is: the color gamut matching method of described multimedia equipment may further comprise the steps: the vision signal that receives is converted to lightness signal and carrier chrominance signal, calculate a two-dimensional surface according to described lightness signal and carrier chrominance signal, tangent first area and the tangent second area that obtains of second colour gamut of obtaining of the described two-dimensional surface and first colour gamut; Lightness signal and carrier chrominance signal according to vision signal calculate the position of described vision signal at the point to be matched of described first area, and described point to be matched is calculated match point in described second area, output match point signal.
Above-mentioned two-dimensional surface is lightness-chroma two-dimensional surface, lightness-hue angle two-dimensional surface or hue angle-chroma two-dimensional surface, when described two-dimensional surface is lightness-chroma two-dimensional surface, the color gamut matching method of described multimedia equipment is further comprising the steps of: calculate the chroma maximum point and the line of first area and second area respectively, be chosen to be anchor point with the intersection point of lightness axis; Described anchor point is connected straight line also obtains first boundary point in mistake border, first area with described match point, cross the second area border and obtain second boundary point, the distance of the anchor point and second boundary point and anchor point are chosen to be the scaling value to the ratio of the distance of first boundary point; The product of point to be matched and scaling value promptly obtains match point.
Above-mentioned first colour gamut and second colour gamut are CIELab space or CIELuv space;
When above-mentioned first colour gamut and second colour gamut were the CIELab space, described vision signal was L
*, a
*, b
*Signal, L
*Be lightness signal, a
*, b
*Be carrier chrominance signal, described chroma signals is C
*=(a
* 2+ b
* 2)
1/2, described L
*And C
*Form lightness-chroma two-dimensional surface coordinate, according to hue angle n=arctanb
*/ a
*Obtain two-dimensional surface; When described first colour gamut and second colour gamut were the CIELuv space, described vision signal was L
*, u
*, v
*Signal, L
*Be lightness signal, u
*, v
*Be carrier chrominance signal, described chroma signals is C
*=(u
* 2+ v
* 2)
1/2, described L
*And C
*Form lightness-chroma two-dimensional surface coordinate, according to hue angle n=arctanv
*/ u
*Obtain two-dimensional surface.
Above-mentioned two-dimensional surface is divided into h equal portions two-dimensional surface according to [0,360 °], and the corresponding 360 °/h of each two-dimensional surface calculates hue angle, obtains corresponding two-dimensional surface; Described h 〉=2n, n are positive number, and h is an integer; The scaling value is divided into m according to [90 °, 90 °], and described m 〉=2n, m are integer, and described scaling value is calculated in advance and stored, and calculate the straight line and the horizontal angle of crossing anchor point of anchor point to point to be matched, obtain corresponding scaling value; Set up two-dimensional look-up table to the straight line of point to be matched with the horizontal angle of crossing anchor point according to hue angle and anchor point, obtain corresponding scaling value.
Display light conversion with above-mentioned multimedia equipment, calculate R coordinate signal, G coordinate signal, B coordinate signal, connect R coordinate signal, G coordinate signal, B coordinate signal respectively and obtain a triangle, conversion of signals and calculate described second colour gamut in the zone that described triangle is comprised.
Above-mentioned multimedia equipment display light can be converted to second colour gamut in advance, stores second colour gamut, carries out the colour gamut coupling for described vision signal; Perhaps above-mentioned multimedia equipment display light and described vision signal are carried out color gamut conversion simultaneously, calculate second colour gamut and point to be matched, described point to be matched is matched in second colour gamut calculates match point.
Second aspect the invention provides a kind of television set, comprises the colour gamut coalignment, the TV signal that receives is carried out colour gamut coupling and output, the colour gamut at described TV signal place is first colour gamut, and described television set is laser display, and described laser colour gamut is second colour gamut; Described colour gamut coalignment comprises: transducer, and the TV signal that is used for receiving is converted to lightness signal and carrier chrominance signal; The two-dimensional surface calculator calculates two-dimensional surface of searching, tangent first area and the tangent second area that obtains of second colour gamut of obtaining of the described two-dimensional surface and first colour gamut according to carrier chrominance signal; Adaptation, the lightness signal and the carrier chrominance signal that obtain according to transducer calculate the position of described TV signal at the point to be matched of described first area, described point to be matched is calculated match point in described second area, output match point signal.
Above-mentioned two-dimensional surface is lightness-chroma two-dimensional surface, lightness-hue angle two-dimensional surface or hue angle-chroma two-dimensional surface, when described two-dimensional surface was lightness-chroma two-dimensional surface, described adaptation also comprised: the anchor point calculation element, be used in described chroma-lightness two-dimensional surface, calculate anchor point; The selected mode of described anchor point is: calculate the chroma maximum point of the chroma maximum point of first area and second area respectively and connect straight line and the intersection point of lightness axis is chosen to be anchor point; The scaling value calculation apparatus is used for calculating the scaling value, and the product of point to be matched and scaling value promptly obtains match point; The account form of described scaling value adopts: anchor point is crossed the border, first area to the straight line of described match point and is obtained first boundary point, cross the second area border and obtain second boundary point, the distance of the anchor point and second boundary point and anchor point are chosen to be the scaling value to the ratio of the distance of first boundary point.
Above-mentioned colour gamut coalignment also comprises laser color gamut conversion device, be used for Wavelength of Laser is changed, and calculate R coordinate signal, G coordinate signal, the B coordinate signal of laser, connect R coordinate signal, G coordinate signal, B coordinate signal respectively and obtain a triangle, with described triangle comprise the zone in conversion of signals to color gamut space, calculate described second colour gamut; Described colour gamut coalignment can be converted to second colour gamut with described laser in advance, and described second colour gamut is stored in the described colour gamut coalignment, and power supply is looked signal and carried out the colour gamut coupling; Described color gamut space is CIELab space or CIELuv space, and when described first colour gamut and second colour gamut were the CIELab space, described TV signal was L
*, a
*, b
*Signal, L
*Be lightness signal, a
*, b
*Be carrier chrominance signal, described chroma signals is C
*=(a
* 2+ b
* 2)
1/2, described L
*And C
*Form lightness-chroma two-dimensional surface coordinate, according to hue angle n=arctanb
*/ a
*Obtain two-dimensional surface; When described first colour gamut and second colour gamut were the CIELuv space, described TV signal was L
*, u
*, v
*Signal, L
*Be lightness signal, u
*, v
*Be carrier chrominance signal, described chroma signals is C
*=(u
* 2+ v
* 2)
1/2, described L
*And C
*Form lightness-chroma two-dimensional surface coordinate, according to hue angle n=arctanv
*/ u
*Obtain two-dimensional surface.Above-mentioned colour gamut coalignment also comprises: the two-dimensional seek meter apparatus is used for searching corresponding scaling value according to the TV signal that receives; Described two-dimensional look-up table is: two-dimensional surface is divided into h equal portions two-dimensional surface according to [0,360 °], and the corresponding 360 °/h of each two-dimensional surface, hue angle calculation obtains corresponding two-dimensional surface; Described h 〉=2n, n are positive number, and h is an integer; The scaling value is divided into m according to [90 °, 90 °], and described m 〉=2n, m are integer, and described scaling value is calculated in advance and stored, and calculate the straight line and the horizontal angle of crossing anchor point of anchor point to point to be matched, obtain corresponding scaling value.
The present invention is converted to lightness signal and carrier chrominance signal by the vision signal that will receive, calculate a two-dimensional surface according to described lightness signal and carrier chrominance signal, tangent first area and the tangent second area that obtains of second colour gamut of obtaining of the described two-dimensional surface and first colour gamut; Lightness signal and carrier chrominance signal according to vision signal calculate the position of described vision signal at the point to be matched of described first area, and described point to be matched is calculated match point in described second area, output match point signal.Can make the display light colour gamut of the vision signal coupling multimedia equipment that receives like this, and then obtain the image color demonstration of high-quality.Below the present invention is described in detail, these and other purpose of the present invention, feature, aspect and advantage will become more obvious.
Description of drawings
Fig. 1 is the embodiment flow chart of the color gamut matching method of multimedia equipment of the present invention;
Fig. 2 is the coupling of the colour gamut in the color gamut matching method of multimedia equipment of the present invention embodiment schematic diagram;
Fig. 3 is the colour gamut coalignment schematic diagram of television set embodiment of the present invention;
Fig. 4 is the adaptation schematic diagram of television set embodiment of the present invention.
Embodiment
In order to make those skilled in the art person understand the present invention program better, and above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with embodiment.
The present invention relates to a kind of color matching method of vision signal, the vision signal that mainly is the outside that will receive is by to the conversion of color space and the processing of colour gamut coupling, the color vision signal that obtains being fit to, and output.The described vision signal that receives is the vision signal of NTSC, PAL or Sequential Color and Memory system formula.
Described vision signal color matching method can obtain the vision signal that receives the carrier chrominance signal of three primary colors through decoding.Described three primary colors comprise polytype, the CIE three primary colors space of representing as the three primary colors space represented with R, G, B, with L, A, B, CIE three primary colors space of representing with L, U, V or the like.We select R, G, the B carrier chrominance signal as three primary colors for use at this, the vision signal that receives are obtained the intensity-modulated signal of R, G, three kinds of colors of B through decoding.Though standard difference owing to the employing of colored vision signal especially colour TV signal, the colour gamut of its coded system, fluorescent material three primary colors is all inequality, but no matter selecting which kind of standard for use, after decoding, all is the intensity-modulated signal that can produce as R, G, three kinds of color types of B.Afterwards described R, G, B signal are carried out match colors.See Fig. 1, concrete matching process may further comprise the steps:
Step S1, the color space conversion.The color space conversion is exactly that the color conversion that a certain color space is represented is represented to another kind of color space.In the present invention, concrete be will with receive R, G, the B signal is converted to purpose color gamut space carrier chrominance signal by a luminance equation.The purpose color gamut space can be selected even color space CIE space such as CIE1976LAB space, CIE1976LUV space.The benefit of selecting even color space for use is when the aberration of color is effective in the value of chromatism of adjacent two-stage in the Munsell system greater than the proper discernable of vision, preferably the psychological feelings effect of reactant body colour.Wherein the CIE1976LUV space can be applied to throw light on, TV shows, CRT shows and other add mixture of colours application.
With the television set is specific embodiment, may further comprise the steps:
Step S100, the television set received television signal.Because TV signal has fixing colour gamut, this colour gamut is first colour gamut.Each TV signal that receives all is in first colour gamut.The display light of television set itself can be that laser display or LED-backlit show.The colour gamut of laser or LED light self is second colour gamut like this.The colour gamut of laser and LED light has broader colour gamut than the first intrinsic colour gamut.First colour gamut and second colour gamut all are that a three-dimensional is spun cone.
The TV signal that receives is converted to lightness signal and carrier chrominance signal.Concrete conversion regime is as follows:
S101 is converted to rgb signal with the TV signal that receives.Because at present all multimedia equipments especially television set all are that RGB drives demonstration, though so vision signal standard difference of adopting of colour TV signal especially, the colour gamut of its coded system, fluorescent material three primary colors is all inequality, but no matter select which kind of standard for use, after decoding, all be the intensity-modulated signal that can produce as R, G, three kinds of color types of B.In of a kind of representative of this rgb signal of the present invention as video driving signal.Here not getting rid of has the multimedia equipment signal to adopt the signal of other types to drive, but no matter which kind of type of drive it adopts, and the rgb signal here will comprise the multimedia equipment drive signal of other types.
The TV signal that receives is converted to R coordinate signal, G coordinate signal, B coordinate signal, connect R coordinate signal, G coordinate signal, B coordinate signal respectively and obtain a triangle, conversion of signals and calculate described first colour gamut in the zone that described triangle is comprised.
In like manner second colour gamut can be by the display light process conversion of television set, obtain R coordinate signal, G coordinate signal, B coordinate signal, connect R coordinate signal, G coordinate signal, B coordinate signal respectively and obtain a triangle, conversion of signals and calculate described second colour gamut in the zone that described triangle is comprised.
Because second colour gamut is according to itself the fixedly display light characteristic decision of multimedia equipment such as television set, so for further the speed of service and the follow-up faster and better colour gamut of carrying out of quickening system are mated, can be converted to second colour gamut in advance to the display light of television set, and store described second colour gamut.
Certain synchronism for the work of follow-up colour gamut coupling, also can carry out color gamut conversion simultaneously to multimedia equipment display light and the described vision signal that receives simultaneously, calculate second colour gamut and point to be matched, described point to be matched is matched in second colour gamut calculates match point.
Afterwards, selected colour gamut type is converted to the signal of selecting the colour gamut type with conversion back rgb signal.The colour gamut type can be selected even color space, as CIE1976LAB space or CIE1976LUV space etc.The benefit of selecting even color space for use is when the aberration of color is effective in the value of chromatism of adjacent two-stage in the Munsell system greater than the resolution of vision, preferably the psychological feelings effect of reactant body colour.Wherein the CIE1976LUV space can be applied to that illumination, TV show, image show (as computer show, handset displays) and other add mixture of colours application.First colour gamut and second colour gamut all belong to same colour gamut type.Because the CIE color space is relevant with the XYZ coordinate signal.So we select the chrominance signal XYZ coordinate signal indication of three primary colors at this.If selected color gamut space type is relevant with other coordinate signals, then the chrominance signal of three primary colors is done adaptive selection.
S102 is converted to the XYZ signal with rgb signal.Its conversion Calculation equation is:
X＝C
rx
rR+C
gx
gG+C
bx
bB
Y＝C
ry
rR+C
gy
gG+C
by
bB (a)
Z＝C
rz
rR+C
gz
gG+C
bz
bB
Wherein:
C
rC
gC
bBe (R) (G) (B) trichromatic coupling component coefficient, x
ry
rz
rBe the chromaticity coordinate of (R) primary colours, x
gy
gz
gBe the chromaticity coordinate of (G) primary colours, x
by
bz
bChromaticity coordinate for (B) primary colours.By the chromaticity coordinate and the reference white photochromism coordinate of RGB three primary colors, substitution (b) formula can obtain C
rC
gC
bNumerical value.
S103 is selected color gamut space signal with the XYZ signal indication that step S102 obtains.
When selected color gamut space is CIE1976Lab, calculate according to the following calculating formula of color gamut conversion relational expression substitution that (a) formula obtains, obtain:
L wherein
*Be lightness (lightness) signal, a
*, b
*Being carrier chrominance signal, is respectively the coordinate figure of color space.
When selected color gamut space is CIE1976Luv, calculate according to the following calculating formula of color gamut conversion relational expression substitution that (a) formula obtains, obtain:
u
*＝13L
*(u′-u′
n)
v
*＝13L
*(v′-v′
n)
u′＝4X/(X+15Y+3Z)
v′＝9Y/(X+15Y+3Z)
u
n′＝4X
n/(X
n+15Y
n+3Z
n)
v
n′＝9Y
n/(X
n+15Y
n+3Z
n)
Wherein, L
*Be lightness (lightness) signal, u
*, v
*Being carrier chrominance signal, is respectively the coordinate figure of color space.(X
nY
nZ
n) for the CIE standard illuminants is radiated on the full up reflector, reflex to the white tristimulus values in observer's eye, wherein Y
n=100.
The method that the TV signal with receiving of the invention described above is converted to lightness signal and carrier chrominance signal has carries out versicolor advantage to the vision signal of different systems in the world especially TV signal unification.
Step S2, the colour gamut coupling.May further comprise the steps:
Lightness and carrier chrominance signal according to the color space switch process of step S1 obtains calculate a two-dimensional surface, tangent first area and the tangent second area that obtains of second colour gamut of obtaining of the described two-dimensional surface and first colour gamut.Described two-dimensional surface can be lightness-chroma two-dimensional surface, lightness-hue angle two-dimensional surface or hue angle-chroma two-dimensional surface.
When described two-dimensional surface is lightness-chroma two-dimensional surface, when selected color gamut space is CIE1976Lab, according to hue angle n=arctanb
*/ a
*Obtain two-dimensional surface.When selected color gamut space is CIE1976Luv, according to hue angle n=arctanv
*/ u
*Obtain two-dimensional surface.Preferentially select lightness-chroma two-dimensional surface for use in the present invention.
When described two-dimensional surface is lightness-hue angle two-dimensional surface, when selected color gamut space is CIE1976Lab, can be according to chroma C
*=(a
* 2+ b
* 2)
1/2Obtain two-dimensional surface.More than shown in step S200, according to the two-dimensional surface of chroma signals that obtains and point to be matched.
When selected color gamut space is CIE1976Luv, according to chroma C
*=(u
* 2+ v
* 2)
1/2Obtain two-dimensional surface.
When described two-dimensional surface is hue angle-chroma two-dimensional surface, when selected color gamut space is CIE1976Lab, can obtain two-dimensional surface according to lightness signal.When selected color gamut space is CIE1976Luv, obtain two-dimensional surface according to lightness signal.
For the further faster and better required two-dimensional surface that finds, we can be provided with the one dimension look-up table to two-dimensional surface, and described look-up table is divided into h equal portions two-dimensional surface to two-dimensional surface according to [0,360 °], and the corresponding 360 °/h of each two-dimensional surface is described; Described h 〉=2n, n are positive number, and h is an integer; Described h specifically can be 360,720,1440 or the like.When selected lightness-chroma two-dimensional surface, calculate hue angle, the corresponding hue angle of each two-dimensional surface directly switches according to the value of hue angle and to obtain corresponding two-dimensional surface.When selected lightness-hue angle two-dimensional surface, calculate chroma, the corresponding chroma of each two-dimensional surface is directly switched according to the value of chroma and to be obtained corresponding two-dimensional surface.During in like manner elected fixation phase angle-chroma two-dimensional surface, the corresponding brightness value of each two-dimensional surface is directly switch to corresponding two-dimensional surface according to the brightness value that obtains.When selected lightness-chroma two-dimensional surface, if the hue angle data that calculate do not occur in look-up table, then can carry out interpolate value and calculate, in described one dimension look-up table, obtain the immediate hue angle of described hue angle and obtain two-dimensional surface the hue angle data of this calculating.In like manner this interpolate value algorithm can be applicable in the two-dimensional surface of other types.
Can calculate in advance in the signal processing system that is stored in multimedia equipment at above one dimension look-up table and the two-dimensional surface data in the look-up table.
Tangent first area and the tangent second area that obtains of second colour gamut of obtaining of the described two-dimensional surface and first colour gamut.
Calculate the transverse axis maximum point and the line of first area and second area respectively, can be chosen to be anchor point with the intersection point of the longitudinal axis.Described anchor point is connected straight line also obtains first boundary point in mistake border, first area with described point to be matched, cross the second area border and obtain second boundary point, the distance of the anchor point and second boundary point and anchor point are chosen to be the scaling value to the ratio of the distance of first boundary point; The product of point to be matched and scaling value promptly obtains match point.With two-dimensional surface is that lightness-chroma two-dimensional surface is an example, can calculate the chroma maximum point and the line of first area and second area respectively, is chosen to be anchor point with the intersection point of lightness axis; Described anchor point is connected straight line also obtains first boundary point in mistake border, first area with described point to be matched, cross the second area border and obtain second boundary point, the distance of the anchor point and second boundary point and anchor point are chosen to be the scaling value to the ratio of the distance of first boundary point; The product of point to be matched and scaling value promptly obtains match point.Comprise also that after step S200 step S201 calculates the position of anchor point, and specifically see Fig. 2 according to the position calculation scaling value S202. of anchor point, in described lightness-chroma two-dimensional surface, transverse axis C
*Be the chroma axle, longitudinal axis L
*Be lightness axis, the chroma maximum point V1 of first area A, the chroma maximum point V2 of second area B, line point V1 and some V2, described line and lightness axis L
*Intersection point R be set at anchor point.In this two-dimensional surface, the position of to be matched some E is known at this.The position of to be matched some E specifically is exactly the L that has calculated early stage
*, a
*, b
*Signal.Connect the straight line of anchor point R and to be matched some E and the crossing first boundary point F that obtains in border of first area A, with the crossing second boundary point G that obtains in the border of second area B.Scaling value K equals the distance and anchor point R ratio to first boundary point F of anchor point R to the second boundary point G.The product of to be matched some E and scaling value K is the position of match point.
The progress of work for further quickening system, find corresponding scaling value as early as possible, in two-dimensional surface, the scaling value is divided into m according to [90 °, 90 °], described m 〉=2n, n is a positive number, m is an integer, and m specifically can be 180,320,540,720 or the like, calculates all scaling values and storage in advance, calculate the straight line and the horizontal angle of crossing anchor point R of anchor point R afterwards, obtain corresponding scaling value to be matched some E.Here [90 °, 90 °] are false origin with anchor point R.Can directly calculate the horizontal line of anchor point E and the angle that anchor point R arrives the straight line of to be matched some E, also can do coordinate transform to whole two-dimensional surface, obtain the data of anchor point R as initial point, obtain the scaling value, and obtain the position of match point, afterwards this two-dimensional surface is done the coordinate inverse transformation, obtain the original plane coordinate.
The one dimension look-up table of two-dimensional surface being set up in conjunction with the front can be set up two-dimensional look-up table with the data of two-dimensional surface and the data of scaling value like this.For example obtain the value of two-dimensional surface, obtain the scaling value according to the straight line of anchor point and point to be matched and the horizontal angle of mistake anchor point according to hue angle.Obtain the position of match point according to the scaling value afterwards in second colour gamut, the signal of output match point is step S203, at this moment, because the position signalling of match point still is the LAB signal at this moment, so also need step S3, described LAB signal is done inverse transformation obtain rgb signal, this rgb signal is exported to display screen.Described inverse transformation and front are corresponding one by one with the mode that rgb signal is transformed to the LAB signal.
Based on vision signal color matching method set forth above, the invention allows for a kind of multimedia equipment.The TV signal that receives converts the TV signal of consolidation form to.The TV signal that receives is the vision signal of NTSC, PAL or Sequential Color and Memory system formula.The TV signal of the outside that television set of the present invention mainly will receive obtain being fit to the colour TV signal of the colour gamut output of television set own, and output shows by to the conversion of color space and the processing of colour gamut coupling.
Described television set comprises the colour gamut coalignment.Described color gamut conversion device can obtain the carrier chrominance signal of three primary colors through decoding with the TV signal that receives, and the carrier chrominance signal of described three primary colors is converted to purpose color gamut space carrier chrominance signal by a luminance equation.Described three primary colors comprise polytype, the CIE three primary colors space of representing as the three primary colors space represented with R, G, B, with X, Y, Z, CIE three primary colors space of representing with L, U, V or the like.We select R, G, the B carrier chrominance signal as three primary colors for use at this, the TV signal that receives are obtained the intensity-modulated signal of R, G, three kinds of colors of B through decoding.Though standard difference owing to the employing of colored vision signal especially colour TV signal, the colour gamut of its coded system, fluorescent material three primary colors is all inequality, but no matter selecting which kind of standard for use, after decoding, all is the intensity-modulated signal that can produce as R, G, three kinds of color types of B.Afterwards described R, G, B signal are carried out match colors.In the present invention, concrete be will with receive R, G, the B signal is converted to purpose color gamut space carrier chrominance signal by a luminance equation.The purpose color gamut space can be selected even color space CIE space such as CIE1976LAB space, CIE1976LUV space.The benefit of selecting even color space for use is when the aberration of color is effective in the value of chromatism of adjacent two-stage in the Munsell system greater than the proper discernable of vision, preferably the psychological feelings effect of reactant body colour.Wherein the CIE1976LUV space can be applied to throw light on, TV shows, CRT shows and other add mixture of colours application.
TV signal has fixing colour gamut in addition, and this colour gamut is first colour gamut.Each TV signal that receives all is in first colour gamut.The display light of television set itself can be that laser display or LED-backlit show.The colour gamut of laser or LED light self is second colour gamut like this.The colour gamut of laser and LED light has broader colour gamut than the first intrinsic colour gamut.First colour gamut and second colour gamut all are that a three-dimensional is spun cone.
Described colour gamut coalignment carries out colour gamut coupling and output to the TV signal that receives.As shown in Figure 3, described colour gamut coalignment comprises transducer 21, two-dimensional surface calculator 22 and adaptation 23.
Described transducer 21, the TV signal that is used for receiving is converted to lightness signal and carrier chrominance signal.The concrete work of transducer is as follows:
1) earlier the TV signal that receives is converted to rgb signal.Because at present all multimedia equipments especially television set all are that RGB drives demonstration, though so vision signal standard difference of adopting of colour TV signal especially, the colour gamut of its coded system, fluorescent material three primary colors is all inequality, but no matter select which kind of standard for use, after decoding, all be the intensity-modulated signal that can produce as R, G, three kinds of color types of B.In of a kind of representative of this rgb signal of the present invention as video driving signal.Here not getting rid of has the multimedia equipment signal to adopt the signal of other types to drive, but no matter which kind of type of drive it adopts, and the rgb signal here will comprise the multimedia equipment drive signal of other types.
The TV signal that receives is converted to R coordinate signal, G coordinate signal, B coordinate signal, connect R coordinate signal, G coordinate signal, B coordinate signal respectively and obtain a triangle, conversion of signals and calculate described first colour gamut in the zone that described triangle is comprised.
In like manner second colour gamut can be by the display light process conversion of television set, obtain R coordinate signal, G coordinate signal, B coordinate signal, connect R coordinate signal, G coordinate signal, B coordinate signal respectively and obtain a triangle, conversion of signals and calculate described second colour gamut in the zone that described triangle is comprised.
Because second colour gamut is according to itself fixedly display light characteristic decision of multimedia equipment, so for further the speed of service and the follow-up faster and better colour gamut of carrying out of quickening system are mated, can be converted to second colour gamut in advance to the display light of multimedia equipment, and store described second colour gamut.
Colour gamut coalignment at this present embodiment can also be provided with laser color gamut conversion device, the Wavelength of Laser of the television set of laser display is changed, and calculate R coordinate signal, G coordinate signal, the B coordinate signal of laser, connect R coordinate signal, G coordinate signal, B coordinate signal respectively and obtain a triangle, with described triangle comprise the zone in conversion of signals to color gamut space, calculate described second colour gamut; Described colour gamut coalignment can be converted to second colour gamut with described laser in advance, and described second colour gamut is stored in the described colour gamut coalignment, and power supply is looked signal and carried out the colour gamut coupling; Described color gamut space is CIELab space or CIELuv space.
Certain synchronism for the work of follow-up colour gamut coupling, also can be simultaneously to the multimedia equipment display light as laser and as described in the vision signal that receives carry out color gamut conversion simultaneously, calculate second colour gamut and point to be matched, described point to be matched is matched in second colour gamut calculates match point.
2) selected colour gamut type is converted to the signal of selecting the colour gamut type with conversion back rgb signal.The colour gamut type can be selected even color space, as CIE1976LAB space or CIE1976LUV space etc.The benefit of selecting even color space for use is when the aberration of color is effective in the value of chromatism of adjacent two-stage in the Munsell system greater than the resolution of vision, preferably the psychological feelings effect of reactant body colour.Wherein the CIE1976LUV space can be applied to that illumination, TV show, image show (as computer show, handset displays) and other add mixture of colours application.First colour gamut and second colour gamut all belong to same colour gamut type.Because the CIE color space is relevant with the XYZ coordinate signal.So we select the chrominance signal XYZ coordinate signal indication of three primary colors at this.If selected color gamut space type is relevant with other coordinate signals, then the chrominance signal of three primary colors is done adaptive selection.
Rgb signal is converted to the XYZ signal.Its conversion Calculation equation is:
X＝C
rx
rR+C
gx
gG+C
bx
bB
Y＝C
ry
rR+C
gy
gG+C
by
bB (a)
Z＝C
rz
rR+C
gz
gG+C
bz
bB
Wherein:
C
rC
gC
bBe (R) (G) (B) trichromatic coupling component coefficient, x
ry
rz
rBe the chromaticity coordinate of (R) primary colours, x
gy
gz
gBe the chromaticity coordinate of (G) primary colours, x
by
bz
bChromaticity coordinate for (B) primary colours.By the chromaticity coordinate and the reference white photochromism coordinate of RGB three primary colors, substitution (b) formula can obtain C
rC
gC
bNumerical value.
Afterwards the XYZ signal indication that obtains is selected color gamut space signal.
When selected color gamut space is CIE1976Lab, calculate according to the following calculating formula of color gamut conversion relational expression substitution that (a) formula obtains, obtain:
L wherein
*Be lightness (lightness) signal, a
*, b
*Being carrier chrominance signal, is respectively the coordinate figure of color space.
When selected color gamut space is CIE1976Luv, calculate according to the following calculating formula of color gamut conversion relational expression substitution that (a) formula obtains, obtain:
u
*＝13L
*(u′-u?′
n)
v
*＝13L
*(v′-v′
n)
u′＝4X/(X+15Y+3Z)
v′＝9Y/(X+15Y+3Z)
u
n′4X
n/(X
n+15Y
n+3Z
n)
v
n′＝9Y
n/(X
n+15Y
n+3Z
n)
Wherein, L
*Be lightness (lightness) signal, u
*, v
*Being carrier chrominance signal, is respectively the coordinate figure of color space.(X
nY
nZ
n) for the CIE standard illuminants is radiated on the full up reflector, reflex to the white tristimulus values in observer's eye, wherein Y
n=100.
The method that the TV signal with receiving of the invention described above is converted to lightness signal and carrier chrominance signal has carries out versicolor advantage to the vision signal of different systems in the world especially TV signal unification.
Described two-dimensional surface calculator 22 calculates two-dimensional surface of searching according to carrier chrominance signal.Tangent first area and the tangent second area that obtains of second colour gamut of obtaining of the described two-dimensional surface and first colour gamut.Described two-dimensional surface can be lightness-chroma two-dimensional surface, lightness-hue angle two-dimensional surface or hue angle-chroma two-dimensional surface.
When described two-dimensional surface is lightness-chroma two-dimensional surface, when selected color gamut space is CIE1976Lab, according to hue angle n=arctanb
*/ a
*Obtain two-dimensional surface.When selected color gamut space is CIE1976Luv, according to hue angle n=arctanv
*/ u
*Obtain two-dimensional surface.
When described two-dimensional surface is lightness-hue angle two-dimensional surface, when selected color gamut space is CIE1976Lab, can be according to chroma C
*=(a
* 2+ b
* 2)
1/2Obtain two-dimensional surface.When selected color gamut space is CIE1976Luv, according to chroma C
*=(u
* 2+ v
* 2)
1/2Obtain two-dimensional surface.
When described two-dimensional surface is hue angle-chroma two-dimensional surface, when selected color gamut space is CIE1976Lab, can obtain two-dimensional surface according to lightness signal.When selected color gamut space is CIE1976Luv, obtain two-dimensional surface according to lightness signal.
Find required two-dimensional surface for further faster and better, we can be provided with the one dimension look-up table to two-dimensional surface, described look-up table to two-dimensional surface according to [0,360 °] be divided into h equal portions two-dimensional surface, the corresponding 360 °/h of each two-dimensional surface, described h 〉=2n, n is a positive number, and h is an integer.
When selected lightness-chroma two-dimensional surface, calculate hue angle, the corresponding hue angle of each two-dimensional surface directly switches according to the value of hue angle and to obtain corresponding two-dimensional surface.When selected lightness-hue angle two-dimensional surface, calculate chroma, the corresponding chroma of each two-dimensional surface is directly switched according to the value of chroma and to be obtained corresponding two-dimensional surface.During in like manner elected fixation phase angle-chroma two-dimensional surface, the corresponding brightness value of each two-dimensional surface is directly switch to corresponding two-dimensional surface according to the brightness value that obtains.When selected lightness-chroma two-dimensional surface, if the hue angle data that calculate do not occur in look-up table, then can carry out interpolate value and calculate, in described one dimension look-up table, obtain the immediate hue angle of described hue angle and obtain two-dimensional surface the hue angle data of this calculating.In like manner this interpolate value algorithm can be applicable in the two-dimensional surface of other types.
Can calculate in advance in the signal processing system that is stored in multimedia equipment at above one dimension look-up table and the two-dimensional surface data in the look-up table.
Described adaptation 23, the lightness signal and the carrier chrominance signal that obtain according to transducer calculate the position of described TV signal at the point to be matched of described first area, described point to be matched is calculated match point in described second area, output match point signal.Tangent first area and the tangent second area that obtains of second colour gamut of obtaining of the described two-dimensional surface and first colour gamut.As shown in Figure 4, described adaptation also comprises: anchor point calculation element 24, scaling value calculation apparatus 25, match point calculation element 26.Described anchor point calculation element 24 is used in described chroma-lightness two-dimensional surface, calculates anchor point; The selected mode of described anchor point is: calculate first area and second area respectively at the transverse axis maximum point of place two-dimensional surface and connect straight line and the intersection point of the longitudinal axis is chosen to be anchor point.With lightness-chroma two-dimensional surface is specific embodiment, can calculate the chroma maximum point of the chroma maximum point of first area and second area respectively and connect straight line and the intersection point of lightness axis is chosen to be anchor point; Described scaling value calculation apparatus 25 is used for calculating the scaling value, and the product of point to be matched and scaling value promptly obtains match point; The account form of described scaling value adopts: anchor point is crossed the border, first area to the straight line of described match point and is obtained first boundary point, cross the second area border and obtain second boundary point, the distance of the anchor point and second boundary point and anchor point are chosen to be the scaling value to the ratio of the distance of first boundary point.Specifically see Fig. 2, in described lightness-chroma two-dimensional surface, transverse axis C
*Be the chroma axle, longitudinal axis L
*Be lightness axis, the chroma maximum point V1 of first area A, the chroma maximum point V2 of second area B, line point V1 and some V2, described line and lightness axis L
*Intersection point R be set at anchor point.In this two-dimensional surface, the position of to be matched some E is known at this.The position of to be matched some E specifically is exactly the L that has calculated early stage
*, a
*, b
*Signal.Connect the straight line of anchor point R and to be matched some E and the crossing first boundary point F that obtains in border of first area A, with the crossing second boundary point G that obtains in the border of second area B.Scaling value K equals the distance and anchor point R ratio to first boundary point F of anchor point R to the second boundary point G.The scaling value K that match point calculation element 26 obtains according to scaling value calculation apparatus 25, to be matched some E and scaling value K multiplied each other obtains the position of match point.
For the progress of work of further quickening system, find corresponding scaling value as early as possible, in two-dimensional surface, the scaling value is divided into m according to [90 °, 90 °], described m 〉=2n, m are integer, n is a positive number.
Calculate all scaling values and storage in advance, calculate the straight line and the horizontal angle of crossing anchor point R of anchor point R afterwards, obtain corresponding scaling value to be matched some E.Here [90 °, 90 °] are false origin with anchor point R.Can directly calculate the horizontal line of anchor point E and the angle that anchor point R arrives the straight line of to be matched some E, also can do coordinate transform to whole two-dimensional surface, obtain the data of anchor point R as initial point, obtain the scaling value, and obtain the position of match point, afterwards this two-dimensional surface is done the coordinate inverse transformation, obtain the original plane coordinate.
The one dimension look-up table of two-dimensional surface being set up in conjunction with the front can be set up two-dimensional look-up table with the data of two-dimensional surface and the data of scaling value like this.In the television set of present embodiment, can also be provided with the two-dimensional seek meter apparatus, the data of two-dimensional surface and the data of scaling value are set in the described two-dimensional seek meter apparatus in advance.Search corresponding scaling value according to the TV signal that receives then.Concrete is example with lightness-chroma two-dimensional surface, can obtain the value of two-dimensional surface according to hue angle, obtains the scaling value according to the straight line of anchor point and point to be matched and the horizontal angle of mistake anchor point.Obtain the position of match point according to the scaling value afterwards, the signal of output match point in second colour gamut.Because this moment, the signal of match point may be still the LAB signal, obtains rgb signal, this rgb signal is exported to display screen so also need an inverse transformation device that described LAB signal is done inverse transformation at this.Described inverse transformation and front are corresponding one by one with the mode that rgb signal is transformed to the LAB signal.
The above only is the specific embodiment of the present invention, and the present invention can also be applied in other multimedia equipment, as computer display device, digital photo frame display device, handset displays equipment etc.Protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range that claim was defined.
Claims (10)
1, a kind of color gamut matching method of multimedia equipment, the vision signal that described multimedia equipment receives is carried out colour gamut coupling and output, the colour gamut at described vision signal place is first colour gamut, and the display light colour gamut of described multimedia equipment is that second colour gamut is characterized in that: the color gamut matching method of described multimedia equipment may further comprise the steps
The vision signal that receives is converted to lightness signal and carrier chrominance signal, calculates a two-dimensional surface, tangent first area and the tangent second area that obtains of second colour gamut of obtaining of the described two-dimensional surface and first colour gamut according to described lightness signal and carrier chrominance signal;
Lightness signal and carrier chrominance signal according to vision signal calculate the position of described vision signal at the point to be matched of described first area, and described point to be matched is calculated match point in described second area, output match point signal.
2, the color gamut matching method of multimedia equipment according to claim 1 is characterized in that: described two-dimensional surface is lightness-chroma two-dimensional surface, and the color gamut matching method of described multimedia equipment is further comprising the steps of:
Calculate the chroma maximum point and the line of first area and second area respectively, be chosen to be anchor point with the intersection point of lightness axis;
Described anchor point is connected straight line also obtains first boundary point in mistake border, first area with described match point, cross the second area border and obtain second boundary point, the distance of the anchor point and second boundary point and anchor point are chosen to be the scaling value to the ratio of the distance of first boundary point;
The product of point to be matched and scaling value promptly obtains match point.
3, the color gamut matching method of multimedia equipment according to claim 2 is characterized in that: described first colour gamut and second colour gamut are CIELab space or CIELuv space;
When described first colour gamut and second colour gamut were the CIELab space, described vision signal was L
*, a
*, b
*Signal, L
*Be lightness signal, a
*, b
*Be carrier chrominance signal, described chroma signals is C
*=(a
* 2+ b
* 2)
1/2, described L
*And C
*Form lightness-chroma two-dimensional surface coordinate, according to hue angle n=arctanb
*/ a
*Obtain two-dimensional surface; When described first colour gamut and second colour gamut were the CIELuv space, described vision signal was L
*, u
*, v
*Signal, L
*Be lightness signal, u
*, v
*Be carrier chrominance signal, described chroma signals is C
*=(u
* 2+ v
* 2)
1/2, described L
*And C
*Form lightness-chroma two-dimensional surface coordinate, according to hue angle n=arctanv
*/ u
*Obtain two-dimensional surface.
4, the color gamut matching method of multimedia equipment according to claim 3 is characterized in that: two-dimensional surface is divided into h equal portions two-dimensional surface according to [0,360 °], and the corresponding 360 °/h of each two-dimensional surface calculates hue angle, obtains corresponding two-dimensional surface; Described h 〉=2n, n are positive number, and h is an integer;
The scaling value is divided into m according to [90 °, 90 °], and described m 〉=2n, m are integer, and described scaling value is calculated in advance and stored, and calculate the straight line and the horizontal angle of crossing anchor point of anchor point to point to be matched, obtain corresponding scaling value;
Set up two-dimensional look-up table to the straight line of point to be matched with the horizontal angle of crossing anchor point according to hue angle and anchor point, obtain corresponding scaling value.
5, according to the color gamut matching method of the arbitrary described multimedia equipment of claim 1 to 4, it is characterized in that: with the display light conversion of described multimedia equipment, calculate R coordinate signal, G coordinate signal, B coordinate signal, connect R coordinate signal, G coordinate signal, B coordinate signal respectively and obtain a triangle, conversion of signals and calculate described second colour gamut in the zone that described triangle is comprised.
6, the color gamut matching method of multimedia equipment according to claim 5 is characterized in that: described multimedia equipment display light can be converted to second colour gamut in advance, stores second colour gamut, carries out the colour gamut coupling for described vision signal;
Perhaps described multimedia equipment display light and described vision signal are carried out color gamut conversion simultaneously, calculate second colour gamut and point to be matched, described point to be matched is matched in second colour gamut calculates match point.
7, a kind of television set comprises the colour gamut coalignment, and the TV signal that receives is carried out colour gamut coupling and output, and the colour gamut at described TV signal place is first colour gamut, and described television set is laser display, and described laser colour gamut is second colour gamut; It is characterized in that: described colour gamut coalignment comprises:
Transducer, the TV signal that is used for receiving is converted to lightness signal and carrier chrominance signal;
The two-dimensional surface calculator calculates two-dimensional surface of searching, tangent first area and the tangent second area that obtains of second colour gamut of obtaining of the described two-dimensional surface and first colour gamut according to carrier chrominance signal;
Adaptation, the lightness signal and the carrier chrominance signal that obtain according to transducer calculate the position of described TV signal at the point to be matched of described first area, described point to be matched is calculated match point in described second area, output match point signal.
8, television set according to claim 7 is characterized in that:
Described two-dimensional surface is lightness-chroma two-dimensional surface, and described adaptation also comprises:
The anchor point calculation element is used in described chroma-lightness two-dimensional surface, calculates anchor point; The selected mode of described anchor point is: calculate the chroma maximum point of the chroma maximum point of first area and second area respectively and connect straight line and the intersection point of lightness axis is chosen to be anchor point;
The scaling value calculation apparatus is used for calculating the scaling value, and the product of point to be matched and scaling value promptly obtains match point;
The account form of described scaling value adopts: anchor point is crossed the border, first area to the straight line of described match point and is obtained first boundary point, cross the second area border and obtain second boundary point, the distance of the anchor point and second boundary point and anchor point are chosen to be the scaling value to the ratio of the distance of first boundary point.
9, according to claim 7 or 8 described television sets, it is characterized in that:
Described colour gamut coalignment also comprises laser color gamut conversion device, be used for Wavelength of Laser is changed, and calculate R coordinate signal, G coordinate signal, the B coordinate signal of laser, connect R coordinate signal, G coordinate signal, B coordinate signal respectively and obtain a triangle, with described triangle comprise the zone in conversion of signals to color gamut space, calculate described second colour gamut; Described colour gamut coalignment can be converted to second colour gamut with described laser in advance, and described second colour gamut is stored in the described colour gamut coalignment, and power supply is looked signal and carried out the colour gamut coupling; Described color gamut space is CIELab space or CIELuv space,
When described first colour gamut and second colour gamut were the CIELab space, described TV signal was L
*, a
*, b
*Signal, L
*Be lightness signal, a
*, b
*Be carrier chrominance signal, described chroma signals is C
*=(a
* 2+ b
* 2)
1/2, described L
*And C
*Form lightness-chroma two-dimensional surface coordinate, according to hue angle n=arctanb
*/ a
*Obtain two-dimensional surface; When described first colour gamut and second colour gamut were the CIELuv space, described TV signal was L
*, u
*, v
*Signal, L
*Be lightness signal, u
*, v
*Be carrier chrominance signal, described chroma signals is C
*=(u
* 2+ v
* 2)
1/2, described L
*And C
*Form lightness-chroma two-dimensional surface coordinate, according to hue angle n=arctanv
*/ u
*Obtain two-dimensional surface.
10, television set according to claim 9 is characterized in that: described colour gamut coalignment also comprises: the two-dimensional seek meter apparatus is used for searching corresponding scaling value according to the TV signal that receives;
Described two-dimensional look-up table is: two-dimensional surface is divided into h equal portions two-dimensional surface according to [0,360 °], and the corresponding 360 °/h of each two-dimensional surface, hue angle calculation obtains corresponding two-dimensional surface; Described h 〉=2n, n are positive number, and h is an integer; The scaling value is divided into m according to [90 °, 90 °], and described m 〉=2n, m are integer, and described scaling value is calculated in advance and stored, and calculate the straight line and the horizontal angle of crossing anchor point of anchor point to point to be matched, obtain corresponding scaling value.
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| WO2013056387A1 (en) * | 2011-10-17 | 2013-04-25 | Liu Travis | Universal gamut mapping and color management method |
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| CN108986769B (en) * | 2018-09-05 | 2020-01-14 | 成都索贝数码科技股份有限公司 | Method for maximally restoring content of Rec.2020 color gamut by display equipment with color gamut lower than Rec.2020 color gamut |
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| CN112947876A (en) * | 2021-01-28 | 2021-06-11 | 维沃移动通信有限公司 | Display control method, display control device, electronic device, and medium |
| CN112947876B (en) * | 2021-01-28 | 2022-08-26 | 维沃移动通信有限公司 | Display control method, display control device, electronic device, and medium |
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