CN101986715B - System and method of expanding laser TV color gamut - Google Patents

Abstract

The invention relates to a system of expanding a laser TV color gamut and a method of expanding the laser TV color gamut. The method expands and simplifies the gamut into a plurality of operation units with small amount of calculation, reduces the hardware realization cost of color gamut expansion and improves the reliability of the system. Standard color gamut video RGB signals which are input are decoded into RGB digital signals by the method. The RGB digital signals are converted to laser RGB signals after respectively passing through a color gamut conversion matrix. A saturation coefficient C is obtained after saturation normalization. Maximum saturation RGB signals are obtained after saturation maximization and the signals are used as indexes to obtain a color gamut expansion coefficient K. The laser color gamut RGB signals, the saturation coefficient and the expansion coefficient K are subjected to a color gamut expansion treatment. Finally, laser TV driving RGB signals subjected to the color gamut expansion are obtained.

Description

A kind of laser television color domain expanding system and method

Technical field

The invention belongs to the laser television color domain expanding system and the method for laser television field of video displaying, particularly a kind of low-cost high-efficiency.

Background technology

Radio and television standard (like SMPTE-C, EBU, ITU-R.BT.709 and sRGB etc.) all is based on CRT monitor three primary colors characteristic and defines colour gamut.Yet the colour gamut of CRT monitor only can show in the Nature about 76% color, and the color of many high saturations all can not be shown.In recent years, wide colour gamut Display Technique became the demonstration hot research fields gradually, and many wide colour gamut TVs are developed out successively; Like many primary colours TV, LED TV and laser television; Wherein because the three primary colors of laser television characteristics such as to have spectrum extremely narrow, and colorimetric purity is high, and brightness is big; It shows that colour gamut can reach about 170% of CRT colour gamut, is state-of-the-art technology in the current wide colour gamut TV.

Because the chromaticity coordinate of laser television three primary colors is different from traditional C RT three primary colors, standard television signal directly applies to laser television will cause misalignment even confusion, and must carry out colour correction to standard television signal through Color Gamut Mapping could normally show.Algorithm to the laser television Color Gamut Mapping occurs, but algorithm generally all relates to the conversion of color space and the calculating of chromaticity coordinate, and operand is bigger.Because the video Color Gamut Mapping needs to handle in real time, the hardware arithmetic speed there is this very harsh requirement, in the consumption market that cost is had strict demand, above algorithm obviously is difficult to be applied to reality.Also have a kind of Color Gamut Mapping framework based on three dimensional lookup table, this framework still needs ample resources to realize storage and data interpolating computing, and the linear interpolation algorithm precision is not high.

Summary of the invention

The present invention is the defective that overcomes prior art, and a kind of laser television color domain expanding system and method for low-cost high-efficiency is provided.This method is reduced to a plurality of amounts of calculation arithmetic element seldom with gamut extension, has reduced the hardware implementation cost of gamut extension, has improved the reliability of system.

For realizing above-mentioned purpose, the present invention adopts following technical scheme:

It comprises:

A rgb signal input module, this module input standard colour gamut RGB digital signal;

A primary conversion matrix is accomplished the conversion of standard colour gamut RGB digital signal to laser colour gamut RGB digital signal;

A saturation normalization device, the saturation coefficient C among the colour gamut that the settles the standard RGB;

A saturation maximization device, maximum rgb value among the colour gamut that the settles the standard RGB;

An expanding system look-up table is according to the maximum rgb value among the definite standard colour gamut RGB of saturation maximization device, the spreading coefficient K that output is corresponding;

A gamut extension processing unit, it is an index with saturation coefficient C, multiplies each other with spreading coefficient K after laser colour gamut RGB is deducted minimum value wherein, multiply by the value of look-up table then, last and laser rgb value and as exporting.

Said primary conversion matrix mainly is made up of multiplier and adder; It is done matrix multiplication through 3*3 transition matrix and standard RGB digital signal and accomplishes; Wherein R, G, B passage are connected with a multiplier respectively among the standard colour gamut RGB; Three multipliers are connected with adder, and adder is connected with the gamut extension processing unit; Wherein, the primary conversion matrix is

then the input/output operation of this module formula is

When said primary conversion matrix adopted wavelength to be 635nm red laser, 532nm green laser and 465nm blue laser respectively at the red-green-blue laser, transition matrix was:

Said saturation normalization device comprises data comparator I; Its input is connected with standard colour gamut RGB input signal, minimum value to the three subtracter I among the output outputting standard colour gamut RGB, three subtracter I be with standard colour gamut RGB in R, G, the corresponding subtracter of B signal; And standard colour gamut R, G, the B value of input deducted the minimum value among the RGB that data comparator I exports respectively; Then three differences are sent into data comparator II, data comparator II then outputs to divider with the maximum in three differences, and divider is a dividend with this maximum; Maximum with rgb space is a divisor, obtains saturation coefficient C.

Said saturation maximization device comprises data comparator III; Its input is connected with standard colour gamut rgb signal input signal; Minimum value to three a subtracter II among the output outputting standard colour gamut RGB; Three subtracter II be with standard colour gamut RGB in R, G, the corresponding subtracter of B signal; Three subtracters deduct the minimum value among the RGB that data comparator III exports respectively with standard colour gamut R, G, the B value of input, and three differences are sent into three dividers and data comparator IV respectively, and data comparator IV sends into three dividers with the maximum in three differences as divisor; The dividend of three dividers is respectively three differences; The output valve of three dividers is sent into three multiplier I respectively as multiplicand, and as multiplier, the output product of three multipliers maximizes RGB as saturation with the rgb space maximum for three multiplier I.

Said spreading coefficient look-up table is made up of the table of 6 256 unit, and a spreading coefficient is all stored in each unit, according to the output valve of saturation maximization device, the spreading coefficient that output is corresponding; Look-up table has been preserved the spreading coefficient of all tone color maximum saturation colors; Through judging whether a chrominance channel is that 0 value and maximum are divided into 6 kinds of situation in the rgb value of saturation maximization back; Represent with [R G B]: [0n 255], [0255n], [2550n], [n 0255], [255n 0] and [n 2550], n is an arbitrary value in the rgb space span; More than corresponding 6 look-up tables of six kinds of situation, the n value is the value index of corresponding look-up table.

Said gamut extension processing unit comprises data comparator V; It outputs to three subtracter III as divisor with the minimum value in the laser rgb value of input; Three subtracter III respectively with the laser rgb value of input as minuend, three differences of output are sent into three multiplier II respectively as multiplicand, three multiplier II with the spreading coefficient K in the one dimension look-up table as multiplier; Three output results are sent into three multiplier III respectively; After three multiplier III multiply each other with saturation coefficient C respectively again, three product values are sent into three adders respectively, three adders again with the laser rgb value in the value addition rear drive of respective channel show.

A kind of laser television color domain expanding method, the RGB digital signal that it is decoded as the standard colour gamut video rgb signal of importing; This RGB digital signal is respectively through converting the laser rgb signal into behind the color gamut conversion matrix; After degree of supersaturation normalization, obtain saturation coefficient C; After degree of supersaturation maximization, obtain the maximum saturation rgb signal, and be that index obtains the gamut extension COEFFICIENT K by this signal; Laser colour gamut rgb signal, saturation coefficient and spreading coefficient K carry out gamut extension together to be handled, and finally obtains driving rgb signal through the laser television of gamut extension.

Said primary conversion matrix is transformed into the normal video rgb signal CIE-XYZ space and then is transformed into the laser rgb space; When the chromaticity coordinate of three primary colors and light source are confirmed, calculate transition matrix and the inverse matrix thereof of rgb space to the CIE-XYZ space through the colorimetry conversion formula.

The normalized algorithm of said saturation is: the peaked ratio of regulation is the saturation coefficient in maximum among the input signal RGB and the rgb space.

The maximized algorithm of said saturation is: input signal RGB is deducted the wherein minimum numerical value of R, G, B respectively; The R that obtains, G, B value simultaneously divided by wherein maximum numerical value, multiply by the result after the maximum of stipulating in the rgb space is the saturation maximization then simultaneously; If regulation RGB span is [0255], then to have a value at least be 0 to the final result rgb value, and having a value at least is 255.

Said spreading coefficient look-up table is to calculate good constant look-up table in advance, and this has shown according to the RGB sequence arrangement of maximum saturation color the spreading coefficient K of all maximum saturation rgb values.

The algorithm that said gamut extension is handled is: designing a domain of definition in advance is the increasing function f (x) of [01] for [0 1], codomain, for any laser colour gamut [RG B] value, drives [R _dG _dB _d] be worth by computes:

Wherein f (x) is through function expression calculating realization or by the realization of tabling look-up.

The algorithm of said spreading coefficient K is: R, G, the peaked ratio of B deduct 1 and are the gamut extension COEFFICIENT K among the maximum of rgb space regulation and the laser colour gamut RGB; For the RGB range digital is the situation of [0255], and maximum is divided into 1526 kinds of tones, needs 1526 K values of storage.

The invention has the beneficial effects as follows: the present invention proposes a kind of new gamut extension scheme; The laser television gamut extension algorithm is reduced to the simple module of a plurality of calculating; This scheme compares with existing laser television gamut extension algorithm that to have amount of calculation few; Advantages such as result of calculation is accurate greatly reduce hardware implementation cost simultaneously, improve the reliability of system.This programme selects to have universality to the three primary colors of laser television, and different three primary colors only change the coefficient of primary conversion matrix.

Description of drawings

Fig. 1 is a kind of sketch map of laser television color domain expanding method of low-cost high-efficiency.

Fig. 2 is a composition frame chart of the present invention;

Fig. 3 is primary conversion matrix module (laser R passage) structured flowchart;

Fig. 4 is a saturation normalization apparatus structure block diagram;

Fig. 5 is saturation maximization apparatus structure block diagram;

Fig. 6 is a gamut extension apparatus structure block diagram.

Wherein, 1. primary conversion matrix, 2. saturation normalization device, 3. saturation maximization device, 4. spreading coefficient look-up table; 5. gamut extension processing unit, 6.RGB signal input module, 7. multiplier, 8. adder, 9. data comparator I; 10. three road subtracter I, 11. data comparator II, 12. dividers, 13. data comparator III; 14. three road subtracter II, 15. three road dividers, 16. data comparator IV, 17. No. three multiplier I; 18. data comparator V, 19. three road subtracter III, 20. No. three multiplier II, 21. No. three multiplier III, 22. three tunnel adders.

Embodiment

Below in conjunction with embodiment the present invention is described further.

Among Fig. 1, the RGB digital signal that it is decoded as the standard colour gamut video rgb signal of importing; This RGB digital signal is respectively through converting the laser rgb signal into behind the color gamut conversion matrix; After degree of supersaturation normalization, obtain saturation coefficient C; After degree of supersaturation maximization, obtain the maximum saturation rgb signal, and be that index obtains the gamut extension COEFFICIENT K by this signal; Laser colour gamut rgb signal, saturation coefficient and spreading coefficient K carry out gamut extension together to be handled, and finally obtains driving rgb signal through the laser television of gamut extension.

Said primary conversion matrix is transformed into the normal video rgb signal CIE-XYZ space and then is transformed into the laser rgb space; When the chromaticity coordinate of three primary colors and light source are confirmed, calculate transition matrix and the inverse matrix thereof of rgb space to the CIE-XYZ space through the colorimetry conversion formula.

The normalized algorithm of said saturation is: the peaked ratio of regulation is the saturation coefficient in maximum among the input signal RGB and the rgb space.

The maximized algorithm of said saturation is: input signal RGB is deducted the wherein minimum numerical value of R, G, B respectively; The R that obtains, G, B value simultaneously divided by wherein maximum numerical value, multiply by the result after the maximum of stipulating in the rgb space is the saturation maximization then simultaneously; If regulation RGB span is [0255], then to have a value at least be 0 to the final result rgb value, and having a value at least is 255.

Said spreading coefficient look-up table is to calculate good constant look-up table in advance, and this has shown according to the RGB sequence arrangement of maximum saturation color the spreading coefficient K of all maximum saturation rgb values.

The algorithm that said gamut extension is handled is: designing a domain of definition in advance is the increasing function f (x) of [01] for [0 1], codomain, for any laser colour gamut [RGB] value, drives [R _dG _dB _d] be worth by computes:

Wherein f (x) is through function expression calculating realization or by the realization of tabling look-up.

The algorithm of said spreading coefficient K is: R, G, the peaked ratio of B deduct 1 and are the gamut extension COEFFICIENT K among the maximum of rgb space regulation and the laser colour gamut RGB; For the RGB range digital is the situation of [0 255], and maximum is divided into 1526 kinds of tones, needs 1526 K values of storage.

When laser three primary colors wavelength is chosen as R:635nm; G:532nm; During B:465nm, laser colour gamut rgb signal to the transition matrix in CIE-XYZ space is: for the video rgb signal of TSC-system formula be to the transition matrix in CIE-XYZ space: then the primary conversion matrix computations formula is

Increasing function f (x) during gamut extension is handled can be that linear function (like f (x)=x), also can be that nonlinear function is (like f (x)=x ⁿ, (n＞1, n ∈ R)), also can be piecewise function.

Above algorithm recommends to use FPGA to realize, is that gamut extension can be accomplished at a high speed through pipelining.

Among Fig. 2, a kind of efficient laser television color domain expanding system and method for designing based on rgb space, it wraps a rgb signal input module 6, this module input standard colour gamut RGB digital signal;

A primary conversion matrix 1 is accomplished the conversion of standard colour gamut RGB digital signal to laser colour gamut RGB digital signal;

A saturation normalization device 2, the saturation coefficient C among the colour gamut that the settles the standard RGB;

A saturation maximization device 3, maximum rgb value among the colour gamut that the settles the standard RGB;

An expanding system look-up table 4 is according to the maximum rgb value among the definite standard colour gamut RGB of saturation maximization device, the spreading coefficient K that output is corresponding;

A gamut extension processing unit 5, it is an index with saturation coefficient C, multiplies each other with spreading coefficient K after laser colour gamut RGB is deducted minimum value wherein, multiply by the value of look-up table then, last and laser rgb value and as exporting.

Among Fig. 3, primary conversion matrix 1 is accomplished the conversion of standard colour gamut RGB digital signal to laser colour gamut RGB digital signal, does matrix multiplication through 3*3 transition matrix and standard RGB digital signal and accomplishes.Including color conversion matrix

then the module's input and output expression is

Specifically constitute: R, G, B passage are connected with a corresponding multiplier 7 respectively among the standard colour gamut RGB, and three multipliers 7 are connected with adder 8, and adder 8 is connected with gamut extension processing unit 5.

When primary conversion matrix 1 adopted wavelength to be 635nm red laser, 532nm green laser and 465nm blue laser respectively at the red-green-blue laser, transition matrix was:

Among Fig. 4, said saturation normalization device 2 will be imported R, G, B value and deduct minimum value among the RGB respectively, take out merchant that maximum and rgb space among the result stipulate maximum saturation coefficient the most.

Specifically constitute: it comprises data comparator I9; Its input is connected with standard colour gamut RGB input signal, and the minimum value among the output outputting standard colour gamut RGB is to three road subtracter I10, three road subtracter I10 be with standard colour gamut RGB in R, G, the corresponding subtracter of B signal; And deduct the minimum value among the RGB that data comparator I9 exports respectively by standard colour gamut R, G, the B value of input; Then difference is sent into data comparator II11, data comparator II11 then outputs to divider 12 with the maximum among R, G, the B, and divider 12 is a dividend with this maximum; Maximum with rgb space is a divisor, obtains saturation coefficient C.

Among Fig. 5, said saturation maximization device 3 will import R, G, B value and deduct one minimum in three values, divided by among three maximum one, multiply by the peaked of rgb space regulation at last and will amass as saturation maximum rgb value then.In the maximum rgb value of saturation, having a chrominance channel at least is 0 value, and having a chrominance channel value at least is maximum.

Specifically constitute: it comprises data comparator III13; Its input is connected with standard colour gamut rgb signal input signal; Minimum value among the output outputting standard colour gamut RGB is to three road subtracter II14; Three road subtracter II14 be with standard colour gamut RGB in R, G, the corresponding subtracter of B signal; Each subtracter deducts the minimum value among the RGB that data comparator III13 exports respectively with standard colour gamut R, G, the B value of input, then R, G, B signal is sent into three road dividers 15 and data comparator IV16 respectively, and data comparator IV16 sends into three road dividers 15 with the maximum in R, G, the B signal as divisor; 15 R that import respectively of three road dividers, G, B signal are as dividend; This quotient is sent into No. three multiplier I17 as multiplicand, and No. three multiplier I17 as multiplier, maximize RGB with both products as saturation with the rgb space maximum.

Among Fig. 6, in the said gamut extension processing unit 5, look-up table is an index with saturation coefficient C, and laser RGB multiplies each other in spreading coefficient K after deducting minimum value wherein, multiply by the value of look-up table then, last and the laser rgb value and conduct output.Look-up table is output as the increasing function of C value, and this function value is [01].

Specifically constitute: it comprises data comparator V18; It outputs to three road subtracter III19 with the minimum value in the laser rgb value of input; Three road subtracter III19 send the minimum value that the laser rgb value of importing deducts input into No. three multiplier II20; No. three multiplier II20 also with the one dimension look-up table in spreading coefficient K send into No. three multiplier III21 after multiplying each other respectively; After No. three multiplier III21 multiply each other respectively at saturation coefficient C again, income value is sent into three tunnel adders, 22, three tunnel adders 22 show with laser rgb value addition rear drive again.

Said spreading coefficient look-up table 4 is made up of the table of 6 256 unit, and a spreading coefficient is all stored in each unit, according to the output valve of saturation maximization device 3, the spreading coefficient that output is corresponding.Look-up table has been preserved the spreading coefficient of all tone color maximum saturation colors.Through judging whether a chrominance channel is that 0 value and maximum can be divided into 6 kinds of situation in the rgb value of saturation maximization back; Represent with [R G B]: [0n 255], [0255n], [2550n], [n 0255], [255n 0] and [n 2550], n is an arbitrary value in the rgb space span.More than corresponding 6 look-up tables of six kinds of situation, the n value is the value index of corresponding look-up table.

Claims (10)

1. laser television color domain expanding system is characterized in that it comprises:

A rgb signal input module, this module input standard colour gamut RGB digital signal;

A primary conversion matrix is accomplished the conversion of standard colour gamut RGB digital signal to laser colour gamut RGB digital signal;

A saturation normalization device, the saturation coefficient C among the colour gamut that the settles the standard RGB; The peaked ratio of regulation is the saturation coefficient in maximum among the input signal RGB and the rgb space;

A saturation maximization device, maximum rgb value among the colour gamut that the settles the standard RGB; Input signal RGB is deducted the wherein minimum numerical value of R, G, B respectively, the R that obtains, G, B value simultaneously divided by wherein maximum numerical value, multiply by the result after the maximum of stipulating in the rgb space is the saturation maximization then simultaneously; If regulation RGB span is [0255], then to have a value at least be 0 to the final result rgb value, and having a value at least is 255;

An expanding system look-up table, spreading coefficient look-up table are to calculate good constant look-up table in advance, and this has shown according to the RGB sequence arrangement of maximum saturation color the spreading coefficient K of all maximum saturation rgb values; According to the maximum rgb value among the definite standard colour gamut RGB of saturation maximization device, the spreading coefficient K that output is corresponding;

A gamut extension processing unit, it is an index with saturation coefficient C, multiplies each other with spreading coefficient K after laser colour gamut RGB is deducted minimum value wherein, multiply by the value of look-up table then, last and laser rgb value and as exporting; The algorithm that gamut extension is handled is: designing a domain of definition in advance is the increasing function f (x) of [01] for [01], codomain, for any laser colour gamut [RGB] value, drives [R _dG _dB _d] be worth by computes: $\left[\begin{array}{c}{R}_d\\ G_d\\ B_d\end{array}\right]=\left[\begin{array}{c}R\\ G\\ B\end{array}\right]+\left(\begin{array}{c}\left[\begin{array}{c}R\\ G\\ B\end{array}\right]\end{array}-\mathrm{Min}(R,G,B)\right)\·K\·f\left(C\right),$ Wherein f (x) is through function expression calculating realization or by the realization of tabling look-up.

2. laser television color domain expanding system as claimed in claim 1; It is characterized in that; Said primary conversion matrix mainly is made up of multiplier and adder, and it is done matrix multiplication through 3*3 transition matrix and standard RGB digital signal and accomplishes, and wherein R, G, B passage are connected with a multiplier respectively among the standard colour gamut RGB; Three multipliers are connected with adder, and adder is connected with the gamut extension processing unit; Wherein, the primary conversion matrix does $\left[\begin{array}{ccc}{a}_1& b_1& c_1\\ a_2& b_2& c_2\\ a_3& b_3& c_3\end{array}\right],$ Then the input/output operation formula of this module does $\left[\begin{array}{c}{R}_{\mathrm{Out}}\\ G_{\mathrm{Out}}\\ B_{\mathrm{Out}}\end{array}\right]=\left[\begin{array}{ccc}{a}_1& b_1& c_1\\ a_2& b_2& c_2\\ a_3& b_3& c_3\end{array}\right]\·\left[\begin{array}{c}{R}_{\mathrm{In}}\\ G_{\mathrm{In}}\\ B_{\mathrm{In}}\end{array}\right].$

3. laser television color domain expanding system as claimed in claim 1 is characterized in that, when said primary conversion matrix adopted wavelength to be 635nm red laser, 532nm green laser and 465nm blue laser respectively at the red-green-blue laser, transition matrix was: $\left[\begin{array}{ccc}0.9963& 0.2780& -0.3235\\ -0.3480& 0.7348& 0.1338\\ 0.1983& 0.0874& 1.0493\end{array}\right].$

4. laser television color domain expanding system as claimed in claim 1; It is characterized in that said saturation normalization device comprises data comparator I, its input is connected with standard colour gamut RGB input signal; Minimum value to three a subtracter I among the output outputting standard colour gamut RGB; Three subtracter I be with standard colour gamut RGB in R, G, the corresponding subtracter of B signal, and standard colour gamut R, G, the B value of input deducted the minimum value among the RGB that data comparator I exports respectively, then three differences are sent into data comparator II; Data comparator II then outputs to divider with the maximum in three differences; Divider is a dividend with this maximum, is divisor with the maximum of rgb space, obtains saturation coefficient C.

5. laser television color domain expanding system as claimed in claim 1; It is characterized in that; Said saturation maximization device comprises data comparator III, and its input is connected with standard colour gamut rgb signal input signal, minimum value to the three subtracter II among the output outputting standard colour gamut RGB; Three subtracter II be with standard colour gamut RGB in R, G, the corresponding subtracter of B signal; Three subtracters deduct the minimum value among the RGB that data comparator III exports respectively with standard colour gamut R, G, the B value of input, and three differences are sent into three dividers and data comparator IV respectively, and data comparator IV sends into three dividers with the maximum in three differences as divisor; The dividend of three dividers is respectively three differences; The output valve of three dividers is sent into three multiplier I respectively as multiplicand, and as multiplier, the output product of three multipliers maximizes RGB as saturation with the rgb space maximum for three multiplier I.

6. laser television color domain expanding system as claimed in claim 1; It is characterized in that said spreading coefficient look-up table is made up of the table of 6 256 unit, a spreading coefficient is all stored in each unit; According to the output valve of saturation maximization device, the spreading coefficient that output is corresponding; Look-up table has been preserved the spreading coefficient of all tone color maximum saturation colors; Through judging whether a chrominance channel is that 0 value and maximum are divided into 6 kinds of situation in the rgb value of saturation maximization back; Represent with [RGB]: [0n255], [0255n], [2550n], [n0255], [255n0] and [n2550], n are arbitrary value in the rgb space span; More than corresponding 6 look-up tables of six kinds of situation, the n value is the value index of corresponding look-up table.

7. laser television color domain expanding system as claimed in claim 1; It is characterized in that; Said gamut extension processing unit comprises data comparator V, and it outputs to three subtracter III as divisor with the minimum value in the laser rgb value of input, three subtracter III respectively with the laser rgb value of input as minuend; Three differences of output are sent into three multiplier II respectively as multiplicand; Three multiplier II as multiplier, send three output results into three multiplier III respectively, after three multiplier III multiply each other with saturation coefficient C respectively again with the spreading coefficient K in the one dimension look-up table; Three product values are sent into three adders respectively, three adders again with the laser rgb value in the value addition rear drive of respective channel show.

8. a laser television color domain expanding method is characterized in that, the RGB digital signal that it is decoded as the standard colour gamut video rgb signal of importing; This RGB digital signal is respectively through converting the laser rgb signal into behind the color gamut conversion matrix; After degree of supersaturation normalization, obtain saturation coefficient C, the normalized algorithm of said saturation is that the peaked ratio of regulation is the saturation coefficient in maximum and the rgb space among the input signal RGB; After the degree of supersaturation maximization, obtain the maximum saturation rgb signal; And be that index obtains the gamut extension COEFFICIENT K by this signal; The maximized algorithm of said saturation is: input signal RGB is deducted the wherein minimum numerical value of R, G, B respectively; The R that obtains, G, B value simultaneously divided by wherein maximum numerical value, multiply by the result after the maximum of stipulating in the rgb space is the saturation maximization then simultaneously; If regulation RGB span is [0255], then to have a value at least be 0 to the final result rgb value, and having a value at least is 255; Laser colour gamut rgb signal, saturation coefficient and spreading coefficient K carry out gamut extension together to be handled, and finally obtains driving rgb signal through the laser television of gamut extension; The algorithm that said gamut extension is handled is: designing a domain of definition in advance is the increasing function f (x) of [01] for [01], codomain, and [the R value drives [R for any laser colour gamut _dG _dValue is by computes: $\left[\begin{array}{c}{R}_d\\ G_d\\ B_d\end{array}\right]=\left[\begin{array}{c}R\\ G\\ B\end{array}\right]+\left(\begin{array}{c}\left[\begin{array}{c}R\\ G\\ B\end{array}\right]\end{array}-\mathrm{Min}(R,G,B)\right)\·K\·f\left(C\right),$ Wherein f (x) is through function expression calculating realization or by the realization of tabling look-up, and wherein look-up table is to calculate good constant look-up table in advance, and this has shown according to the RGB sequence arrangement of maximum saturation color the spreading coefficient K of all maximum saturation rgb values.

9. laser television color domain expanding method as claimed in claim 8 is characterized in that, said primary conversion matrix is transformed into the normal video rgb signal CIE-XYZ space and then is transformed into the laser rgb space; When the chromaticity coordinate of three primary colors and light source are confirmed, calculate transition matrix and the inverse matrix thereof of rgb space to the CIE-XYZ space through the colorimetry conversion formula; The normalized algorithm of said saturation is: the peaked ratio of regulation is the saturation coefficient in maximum among the input signal RGB and the rgb space; The maximized algorithm of said saturation is: input signal RGB is deducted the wherein minimum numerical value of R, G, B respectively; The R that obtains, G, B value simultaneously divided by wherein maximum numerical value, multiply by the result after the maximum of stipulating in the rgb space is the saturation maximization then simultaneously; If regulation RGB span is [0255], then to have a value at least be 0 to the final result rgb value, and having a value at least is 255; Said spreading coefficient look-up table is to calculate good constant look-up table in advance, and this has shown according to the RGB sequence arrangement of maximum saturation color the spreading coefficient K of all maximum saturation rgb values; The algorithm of said spreading coefficient K is: R, G, the peaked ratio of B deduct 1 and are the gamut extension COEFFICIENT K among the maximum of rgb space regulation and the laser colour gamut RGB; For the RGB range digital is the situation of [0255], and maximum is divided into 1526 kinds of tones, needs 1526 K values of storage.

10. laser television color domain expanding method as claimed in claim 9 is characterized in that, the algorithm that said gamut extension is handled is: designing a domain of definition in advance is the increasing function f (x) of [01] for [01], codomain, for any laser colour gamut [RGB] value, drives [R _dG _dB _d] be worth by computes: $\left[\begin{array}{c}{R}_d\\ G_d\\ B_d\end{array}\right]=\left[\begin{array}{c}R\\ G\\ B\end{array}\right]+\left(\begin{array}{c}\left[\begin{array}{c}R\\ G\\ B\end{array}\right]\end{array}-\mathrm{Min}(R,G,B)\right)\·K\·f\left(C\right),$ Wherein f (x) is through function expression calculating realization or by the realization of tabling look-up.

Images