CN102237025B - A look-up table generation method for display color correction - Google Patents
A look-up table generation method for display color correction Download PDFInfo
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Abstract
A method for generating lookup table used for display color correction includes obtaining stimulus value of each gray scale of three primary colors measured by display, obtaining stimulus value of each gray scale of three primary colors of display target, and comparing measured stimulus value of each gray scale of three primary colors with stimulus value of each gray scale of three primary colors of target to obtain lookup table used for display color correction. The invention calculates the corresponding lookup table for the display color correction according to the display characteristics of the measured display to achieve the set color temperature and brightness curve, thereby increasing the accuracy of color temperature and brightness adjustment and shortening the adjustment time to reduce the cost expenditure.
Description
Technical field
The invention relates to a kind of display color alignment technique, and a kind of look-up table production method of proofreading and correct for display color particularly.
Background technology
In the production run of display (as LCD etc.), the homogeneity of the luminous ratio of its Red Green Blue generally all is difficult to reach, the consistance of each display color performance when causing guaranteeing to dispatch from the factory, even same label, also be so with the display of a collection of production and same process, therefore dispatching from the factory at display needs the program adjusted through one white balance as last.
White balance adjustment most common form is that half black half white signal of video signal is input to display on the production line at present, color coordinate by bright dark these two brightness of showing on the apparatus measures display screen is with respect to the deviation of the color coordinate of reference white again, adjust the side-play amount (offset) of red, green, blue three looks and the driving voltage that gain (gain) six parameters change red, green, blue three looks repeatedly according to deviate, make the white of display under bright dark these two brightness consistent with reference white.
Yet above-mentioned this white balance adjustment mode has only the white balance of adjusting under bright dark these two brightness, thus can be inaccurate in its colour temperature of part (being grey exponent part) in the middle of bright dark these two brightness, and have no idea brightness curve is adjusted.In addition, display generally all has multiple signalling channels such as HDMI, DVI, VGA, YPbPr, Video at present, each signalling channel also possesses 3 colour temperature patterns (as cool colour 12000K, standard 9300K, warm colour 6500K), if adopt manually one by one signalling channel, colour temperature mode adjustment white balance one by one, not only need to expend the time of a large amount of operations and adjustment, the consistance of display color performance also can't guarantee.
Summary of the invention
In order quick and precisely to adjust display color temperature and brightness curve, the invention provides a kind of look-up table production method for the display color correction.Described technical scheme is as follows: on the one hand, a kind of look-up table production method for the display color correction, described method comprises:
Each GTG and three primary colors that measurement shows respectively on display device screen, obtain tristimulus values and the described trichromatic tristimulus values of described each GTG, wherein, the tristimulus values of described each GTG are that minimum gray is distinguished corresponding XYZ values to maximum gray, and described trichromatic tristimulus values are the three primary colors maximum gray XYZ values of correspondence respectively;
According to the tristimulus values of each GTG of measuring and the trichromatic tristimulus values of measurement, calculate the values of each GTG of three primary colors of measurement, wherein, the values of described each GTG of three primary colors is X values, Y values or the Z values of three primary colors minimum gray to three primary colors maximum gray difference correspondence;
According to the tristimulus values of the maximum gray of the color temperature value of target and measurement, calculate the high-high brightness of target;
According to the high-high brightness of target, the color temperature value of target and the gamma value of target, calculate the tristimulus values of each GTG of target;
According to the tristimulus values of each GTG of target and the trichromatic tristimulus values of measurement, calculate the values of each GTG of three primary colors of target;
When the values of a certain GTG of a certain primary colors of target is between the values of corresponding two GTGs of measuring of this primary colors, utilize the values of this GTG of this primary colors that interpolation method calculates target in the GTG value that between corresponding two GTGs of this primary colors of measuring, corresponds to, the GTG value of this GTG correspondence of this primary colors of target is inserted look-up table; And
When a certain primary colors of target by minimum gray to the values of a certain GTG all not when the values of next GTG of this this GTG of primary colors of target between the values of corresponding two GTGs of measuring of this primary colors is then between the values of corresponding two GTGs of measuring of this primary colors, this primary colors of target is inserted look-up table by minimum gray to the GTG value line taking sexual intercourse of next GTG correspondence of this GTG.
On the one hand, the described values that calculates each GTG of three primary colors of measurement also comprises again:
According to the tristimulus values of the maximum gray of measuring and the trichromatic tristimulus values of measurement, the tristimulus values of each GTG of correcting measuring replace the tristimulus values of each GTG of described measurement then with the tristimulus values of each GTG of the measurement of proofreading and correct.
Again on the one hand, the GTG value of described this GTG correspondence of this primary colors with target is inserted look-up table, also comprises:
The GTG of this GTG correspondence of this primary colors of target is on duty with a gain and add a side-play amount and the GTG value of this GTG correspondence of this primary colors of the target that obtains revising, replace the GTG value of this GTG correspondence of this primary colors of described target then with the GTG value of this GTG correspondence of this primary colors of the target revised.
Again on the one hand, xyY, the Luv or the Lab that derive with the XYZ values replace described tristimulus values.
The present invention calculates the corresponding look-up table that display color is proofreaied and correct that is used for by adopting the display characteristic according to measured display, to reach colour temperature and the brightness curve that sets, overcome the problem that prior art utilizes yield value and reference value to produce, and increase the accuracy of colour temperature and brightness adjustment and shorten the time of adjusting, to reduce the expenditure of cost.
Description of drawings
Fig. 1 is the process flow diagram of a kind of look-up table production method of proofreading and correct for display color of providing of preferred embodiment of the present invention;
Fig. 2 utilizes the tristimulus values of each GTG of the measurement that method shown in Figure 1 obtains and the trichromatic tristimulus values of measurement;
Fig. 3 utilizes the tristimulus values of each GTG of measurement of the correction that method shown in Figure 1 obtains and the trichromatic tristimulus values of measurement;
Fig. 4 is the values of utilizing each GTG of three primary colors of the measurement that method shown in Figure 1 obtains;
Fig. 5 is the tristimulus values of utilizing each GTG of the target that method shown in Figure 1 obtains;
Fig. 6 is the values of utilizing each GTG of three primary colors of the target that method shown in Figure 1 obtains;
Fig. 7 is the look-up table that is used for the display color correction that utilizes method shown in Figure 1 to obtain.
Main element symbol description in the accompanying drawing is as follows:
S1: the values that obtains each GTG of three primary colors of display measurement;
S11: tristimulus values and the trichromatic tristimulus values of measuring each GTG of display;
S12: according to the tristimulus values of the maximum gray of measuring and the trichromatic tristimulus values of measurement, the tristimulus values of each GTG of correcting measuring;
S13: according to the tristimulus values of each GTG of the measurement of proofreading and correct and the trichromatic tristimulus values of measurement, calculate the values of each GTG of three primary colors of measurement;
S2: the values that obtains each GTG of three primary colors of display target;
S21: the high-high brightness that calculates target according to the tristimulus values of the maximum gray of the measurement of the color temperature value of target and correction;
S22: according to the high-high brightness of target, the color temperature value of target and the gamma value of target, calculate the tristimulus values of each GTG of target;
S23: according to the tristimulus values of each GTG of target and the trichromatic tristimulus values of measurement, calculate the values of each GTG of three primary colors of target;
S3: the values of the values of each GTG of three primary colors of matching measurement and each GTG of three primary colors of target is to obtain the look-up table of proofreading and correct for display color;
S31: when the values of a certain GTG of a certain primary colors of target is between the values of corresponding two GTGs of measuring of this primary colors, utilize interpolation method to calculate the values of this GTG of this primary colors of target in the GTG value that between corresponding two GTGs of this primary colors of measuring, corresponds to;
S32: the GTG of this GTG correspondence of this primary colors of target is on duty with a gain and add a side-play amount and the GTG value of this GTG correspondence of this primary colors of the target that obtains revising;
S33: the GTG value of each GTG correspondence of three primary colors of the target revised is inserted look-up table;
S34: when a certain primary colors of target by minimum gray to the values of a certain GTG all not when the values of next GTG of this GTG of this primary colors of target between the values of corresponding two GTGs of measuring of this primary colors is then between the values of corresponding two GTGs of measuring of this primary colors, this primary colors of target is inserted look-up table by minimum gray to the GTG value line taking sexual intercourse of next GTG correspondence of this GTG.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
For convenience of description, the three primary colors of display are example with red (R), green (G), blue (B), and the rgb value that the color that shows on the display screen is encoded with every pixel 24 bits is example.Rgb value is so that (r, g represent that b) wherein r, g, b are respectively red, green, blue component, and r, g, b are respectively arbitrary integer in 0～255.When rgb value is that (i, i represent i rank GTG in the time of i), i is arbitrary integer in 0～255, wherein, (0,0,0) expression the 0th rank GTG, minimum gray or dull gray rank, i.e. black, and (255,255,255) expression the 255th rank GTG, maximum gray or the brightest GTG, i.e. white.When being (i, 0,0), rgb value represents red i rank GTG, represents with Ri that wherein, (255,0,0) or R255 represent red the 255th rank GTG, and be namely red.When being (0, i, 0), rgb value represents green i rank GTG, represents with Gi that wherein, (0,255,0) or G255 represent green the 255th rank GTG, and be namely green.When rgb value be (0,0, represent blue i rank GTG in the time of i), represent that with Bi wherein, (0,0,255) or B255 represent blue the 255th rank GTG, namely blue.
Fig. 1 is the process flow diagram of a kind of look-up table production method of proofreading and correct for display color of providing of the embodiment of the invention.See also Fig. 1, a kind of look-up table production method of proofreading and correct for display color that the embodiment of the invention provides comprises three big step S1～S3 successively, at first at step S1, obtain the values of each GTG of three primary colors of display measurement, then at step S2, obtain the values of each GTG of three primary colors of display target, at last at step S3, the values of the values of each GTG of three primary colors of matching measurement and each GTG of three primary colors of target is to obtain the look-up table of proofreading and correct for display color.Display can utilize this look-up table to adjust display color temperature and brightness curve.
In the present embodiment, step S1 comprises step S11～S13 successively, for the values of each GTG of three primary colors of obtaining the display measurement.At step S11, measure the tristimulus values (X shown in table on Fig. 2 of each GTG of display
0"～X
255", Y
0"～Y
255", Z
0"～Z
255"), and the trichromatic tristimulus values (X shown in Fig. 2 following table of measurement display
R255, X
G255, X
B255, Y
R255, Y
G255, Y
B255, Z
R255, Z
G255, Z
B255).Wherein, " tristimulus values " of " each GTG " of measurement namely are to show " the 0th to 255 rank GTG " respectively and obtain its each self-corresponding " XYZ values " by apparatus measures on the display screen; And " tristimulus values " of " three primary colors " measured namely are to show " red (R255), green (G255), blue (B255) " respectively and obtain its each self-corresponding " XYZ values " by apparatus measures on the display screen.
According to additive color mixing principle, X ideally
255"=X
R255+ X
G255+ X
B255, Y
255"=Y
R255+ Y
G255+ Y
B255And Z
255"=Z
R255+ Z
G255+ Z
B255, but because factors such as apparatus measures error, in fact
And
Therefore need revise.At step S12, according to the tristimulus values (X shown in table on Fig. 2 of the maximum gray of measuring
255", Y
255", Z
255") and the trichromatic tristimulus values (X shown in Fig. 2 following table that measures
R255, X
G255, X
B255, Y
R255, Y
G255, Y
B255, Z
R255, Z
G255, Z
B255), the tristimulus values of each GTG of the correcting measuring (X shown in table on Fig. 3
0～X
255, Y
0～Y
255, Z
0～Z
255).In the present embodiment, with (X
R255+ X
G255+ X
B255) divided by X
255" obtain correction factor a, then with X
0"～X
255" be multiplied by the X values (X shown in table on Fig. 3 of each GTG of the measurement that correction factor a can obtain proofreading and correct respectively
0～X
255); With (Y
R255+ Y
G255+ Y
B255) divided by Y
255" obtain correction factor b, then with Y
0"～Y
255" be multiplied by the Y values (Y shown in table on Fig. 3 of each GTG of the measurement that correction factor b can obtain proofreading and correct respectively
0～Y
255); With (Z
R255+ Z
G255+ Z
B255) divided by Z
255" obtain correction factor c, then with Z
0"～Z
255" be multiplied by the Z values (Z shown in table on Fig. 3 of each GTG of the measurement that correction factor c can obtain proofreading and correct respectively
0～Z
255).
At step S13, according to the tristimulus values (X shown in table on Fig. 3 of each GTG of the measurement of proofreading and correct
0～X
255, Y
0～Y
255, Z
0～Z
255) and the trichromatic tristimulus values (X shown in Fig. 2 or Fig. 3 following table that measures
R255, X
G255, X
B255, Y
R255, Y
G255, Y
B255, Z
R255, Z
G255, Z
B255), calculate the values (X as shown in Figure 4 of each GTG of three primary colors of measurement
R0～X
R255, Y
G0～Y
G255, Z
B0～Z
B255).Wherein, " values " of measurement " each GTG of three primary colors " comprises " the Y values " of " the X values " of measurement " red each GTG (R0～R255) ", " green each GTG (G0～G255) " of measuring, " the Z values " of " blue each GTG (B0～B255) " of measuring.
In the present embodiment, suppose unknown number I
i, J
i, K
iThe values of the i rank GTG of representative measurement is with respect to the number percent of the trichromatic values of measuring respectively, and i is arbitrary integer in 0～255, and it is as follows to list equation:
X
R255×I
i+X
G255×J
i+X
B255×K
i＝X
i
Y
R255×I
i+Y
G255×J
i+Y
B255×K
i＝Y
i
Z
R255×I
i+Z
G255×J
i+Z
B255×K
i＝Z
i
Simultaneous solution can get I
i, J
i, K
iThen, with the I that obtains
i, J
i, K
iThe following formula of substitution:
X
Ri＝X
R255×I
i
Y
Gi＝Y
G255×J
i
Z
Bi＝Z
B255×K
i
X values (the X of the redness i rank GTGs (Ri) that can obtain measuring
Ri), the Y values (Y of the green i rank GTGs (Gi) measured
Gi), the Z values (Z of the blueness i rank GTGs (Bi) measured
Bi).At last, the values of each GTG of three primary colors that all can obtain measuring by above-mentioned simultaneous equations and formula when 0～255 all i values.
For instance, be example with the 128th rank GTG of measuring, unknown number I
128, J
128, K
128The values of the 128th rank GTG of representative measurement is with respect to the number percent of the trichromatic values of measuring respectively, and it is as follows to list equation:
185.0448×I
128+145.8495×J
128+111.1191×K
128＝93.51114
98.0262×I
128+311.0104×J
128+43.58617×K
128＝95.79320
7.121009×I
128+70.13288×J
128+613.829×K
128＝142.9727
Simultaneous solution can get I
128=0.214873807, J
128=0.211372809, K
128=0.206276337.Then, with the I that obtains
128, J
128, K
128The following formula of substitution can calculate the X values X of redness the 128th rank GTG (R128) of measurement
R128=X
R255* I
128=39.76128, the Y values Y of green the 128th rank GTG (G128) of Ce Lianging
G128=Y
G255* J
128=65.73914, the Z values Z of blueness the 128th rank GTG (B128) of Ce Lianging
B128=Z
B255* K
128=126.6184.
Except as present embodiment by each GTG of the redness that calculates measurement (X values (X of R0～R255)
R0～X
R255) outside, can certainly be by on the display screen, showing red the 0th to 255 rank GTG (R0～R255) and by apparatus measures obtain its each self-corresponding X values (X respectively
R0～X
R255); And each GTG of green of measuring (Y values (Y of G0～G255)
G0～YG255), each GTG of blueness of measuring (Z values (Z of B0～B255)
B0～Z
B255) can obtain by actual measurement equally.
In the present embodiment, step S2 comprises step S21～S23 successively, for the values of each GTG of three primary colors of obtaining the display target.At step S21, according to the tristimulus values (X shown in table on Fig. 3 of the maximum gray of the color temperature value (x and y) of target and the measurement of proofreading and correct
255, Y
255, Z
255) calculate the high-high brightness (L of target
MAX).In the present embodiment, be that chromaticity coordinates x=0.313, y=0.329 are example with the color temperature value of target, the tristimulus values (X shown in table on Fig. 3 of the maximum gray of the hypothesis measurement of proofreading and correct earlier
255, Y
255, Z
255) middle X values (X
255) be the brightest person, whether verify hypothesis is correct again.X values (X in the maximum gray of the measurement of proofreading and correct
255) under the brightest person's situation, utilize the relation of regular values x, y, z and values X, Y, Z to calculate its tristimulus values by following formula to be
X
MAX＝X
255＝442.0134
Y
XMAX＝X
MAX×(y/x)＝442.0134×0.329/0.313＝464.6083342
Z
XMAX＝Y
XMAX×(1-x-y)/y
＝464.6083342×(1-0.313-0.329)/0.329＝505.5616524
Suppose unknown number U
255, V
255, W
255Represent the values of the 255th rank GTG of target respectively with respect to the number percent of the trichromatic values of measuring, it is as follows to list equation:
X
R255×U
255+X
G255×V
255+X
B255×W
255＝X
MAX
Y
R255×U
255+Y
G255×V
255+Y
B255×W
255＝Y
XMAX
Z
R255×U
255+Z
G255×V
255+Z
B255×W
255＝Z
XMAX
Simultaneous solution can get U
255=1.160181522, V
255=1.03116645, W
255=0.6923448, by U
255, V
255, W
255Size suppose the X values (X of the maximum gray of the measurement of proofreading and correct as can be known
255) be that the brightest person is correct.If the X values (X of the maximum gray of the measurement that discovery is proofreaied and correct this moment
255) for the brightest person's hypothesis is wrong, then suppose the Y values (Y of the maximum gray of the measurement of proofreading and correct instead
255) being the brightest person, the imitation above-mentioned steps recomputates U
255, V
255, W
255Whether correct to confirm hypothesis.If the Y values (Y of the maximum gray of the measurement of proofreading and correct
255) for the brightest person's hypothesis remains mistake, the Z values (Z of the maximum gray of the measurement of Jiao Zhenging then
255) must be the brightest person, the imitation above-mentioned steps recomputates U
255, V
255, W
255And U
255, V
255, W
255Middle the maximum must be W
255
In order to make the high-high brightness (L of target
MAX) meet the actual accessible high-high brightness of display, must be earlier with U
255, V
255, W
255Size just can be used as the high-high brightness (L that correct percentage recently calculates target divided by the maximum wherein
MAX).In the present embodiment, U
255, V
255, W
255Middle the maximum is U
255, so the high-high brightness (L of target
MAX) be
L
MAX＝Y
R255×(U
255/U
255)+Y
G255×(V
255/U
255)+Y
B255×(W
255/U
255)
＝400.4617599
At step S22, according to the high-high brightness (L of target
MAX), the color temperature value (x and y) of target and the gamma value (γ) of target, calculate the tristimulus values (X as shown in Figure 5 of each GTG of target
0'～X
255', Y
0'～Y
255', Z
0'～Z
255').In the present embodiment, the tristimulus values (X of the i rank GTG of target
i', Y
i', Z
i'), i is arbitrary integer in 0～255, its computing formula is as follows
Y
i’＝L
MAX×(i/255)
γ+Y
0
X
i’＝Y
i’×x/y
Z
i’＝Y
i’×(1-x-y)/y
Hold for example, be example with the 128th rank GTG of target, the gamma value γ of hypothetical target is 2.2, the tristimulus values that can calculate the 128th rank GTG of target are
Y
128’＝L
MAX×(128/255)
2.2+Y
0＝88.01657283
X
128’＝Y
128’×x/y＝83.7361316
Z
128’＝Y
i’×(1-x-y)/y＝95.77487256
At step S23, according to the tristimulus values (X as shown in Figure 5 of each GTG of target
0'～X
255', Y
0'～Y
255', Z
0'～Z
255') and the trichromatic tristimulus values (X shown in Fig. 3 following table that measures
R255, X
G255, X
B255, Y
R255, Y
G255, Y
B255, Z
R255, Z
G255, Z
B255), calculate the values (X as shown in Figure 6 of each GTG of three primary colors of target
R0'～X
R255', Y
G0'～Y
G255', Z
B0'～Z
B255').In one embodiment, suppose unknown number U
i, V
i, W
iRepresent the values of i rank GTG of target respectively with respect to the number percent of the trichromatic values of measuring, i is arbitrary integer in 0～255, and it is as follows to list equation:
X
R255×U
i+X
G255×V
i+X
B255×W
i＝X
i’
Y
R255×U
i+Y
G255×V
i+Y
B255×W
i＝Y
i’
Z
R255×U
i+Z
G255×V
i+Z
B255×W
i＝Z
i’
Simultaneous solution can get U
i, V
i, W
iThen, with the U that obtains
i, V
i, W
iThe following formula of substitution:
X
Ri’＝X
R255×U
i
Y
Gi’＝Y
G255×V
i
Z
Bi’＝Z
B255×W
i
Can obtain the X values (X of the redness i rank GTGs (Ri) of target
Ri'), the Y values (Y of the green i rank GTGs (Gi) of target
Gi'), the Z values (Z of the blueness i rank GTGs (Bi) of target
Bi').At last, all can obtain the values of each GTG of three primary colors of target by above-mentioned simultaneous equations and formula when 0～255 all i values.
Hold for example, unknown number U
128, V
128, W
128Represent the values of the 128th rank GTG of target respectively with respect to the number percent of the trichromatic values of measuring, it is as follows to list equation:
185.0448×U
128+145.8495×V
128+111.1191×W
128＝83.7361316
98.0262×U
128+311.0104×V
128+43.58617×W
128＝88.01657283
7.121009×U
128+70.13288×V
128+613.829×W
128＝95.77487256
Simultaneous solution can get U
128=0.219787709, V
128=0.195346769, W
128=0.131159542.Then, with the U that obtains
128, V
128, W
128The following formula of substitution can calculate the X values X of redness the 128th rank GTG (R128) of target
R128'=X
R255* U
128=40.67057, the Y values Y of green the 128th rank GTG (G128) of target
G128'=Y
G255* V
128=60.75488, the Z values Z of blueness the 128th rank GTG (B128) of target
B128'=Z
B255* W
128=80.50953.
In the present embodiment, step S3 comprises step S31～S34 successively, is used for the values (X as shown in Figure 4 of each GTG of three primary colors of matching measurement
R0～X
R255, Y
G0～Y
G255, Z
B0～Z
B255) and the values (X as shown in Figure 6 of each GTG of three primary colors of target
R0'～X
R255', Y
G0'～Y
G255', Z
B0'～Z
B255) to obtain the look-up table of proofreading and correct for display color (as Fig. 7).At step S31, when the values of a certain GTG of a certain primary colors of target is between the values of corresponding two GTGs of measuring of this primary colors, utilize interpolation method to calculate the values of this GTG of this primary colors of target in the GTG value that between corresponding two GTGs of this primary colors of measuring, corresponds to.In order to increase the data resolution, can optionally handle to increase the data resolution to the GTG value of utilizing interpolation method to calculate.If it is will increase the data resolution, at step S32, that the GTG of this GTG correspondence of this primary colors of the target that calculates is on duty with a gain and add a side-play amount and the GTG value of this GTG correspondence of this primary colors of the target that obtains revising.At step S33, the GTG value of each GTG correspondence of three primary colors of the target revised is inserted look-up table (as Fig. 7).
For instance, be example with redness the 128th rank GTG of target, the values (X of redness the 128th rank GTG (R128) of target
R128') be 40.67057, the values (X of redness the 129th rank GTG (R129) measured
R129) be 40.50521, the values (X of redness the 130th rank GTG (R130) measured
R130) be 41.26324, so the values (X of redness the 128th rank GTG (R128) of target
R128') between the values (X of red corresponding two GTGs of measuring (R129 and R130)
R129And X
R130) between.Then, utilize interpolation method to calculate the values (40.67057) of redness the 128th rank GTG (R128) of target in the GTG value (about 129.2) that between red corresponding two GTGs of measuring (R129 and R130), corresponds to.In order to increase the data resolution, the GTG value (about 129.2) of this GTG correspondence of this primary colors of the target that calculates be multiply by a gain (as 4) and add a side-play amount (as 3) and the GTG value of this GTG correspondence of this primary colors of the target that obtains revising, wherein gain (as 4) can become the GTG on script 8 bits 0～255 rank the GTG on 10 bits, 0～1023 rank, and originally 8 bit maximum gray (i.e. the 255th rank GTG) multiply by 4 and will become the 1020th rank GTG, so add side-play amount (as 3) in order to the 1020th rank GTG is become the 1023rd rank GTG.At last, the corresponding GTG value (129.2 * 4+3=519.8 of redness the 128th rank GTG (R128) with the target revised, about 520) insert look-up table, insert 520 as redness (R) field (i.e. red the 128th rank GTG (R128)) at the 128th rank GTG shown in Figure 7.
At step S34, when a certain primary colors of target by minimum gray to the values of a certain GTG all not when the values of next GTG of this GTG of this primary colors of target between the values of corresponding two GTGs of measuring of this primary colors is then between the values of corresponding two GTGs of measuring of this primary colors, this primary colors of target is inserted look-up table by minimum gray to the GTG value line taking sexual intercourse of next GTG correspondence of this GTG, and wherein the GTG value of this primary colors minimum gray correspondence of target is zero.
For instance, at the values (x of each GTG of three primary colors of target shown in Figure 6
R0'～X
R255', Y
G0'～Y
G255', Z
B0'～Z
B255') among, blueness the 0th～7 rank GTG of the target (values (Z of B0～B7)
B0'～Z
B7') all not between the values of blue corresponding two GTGs of measuring; In other words, the blueness of target is by the values (Z of minimum gray (B0) to a certain GTG (B7)
B0'～Z
B7') all not between the values of blue corresponding two GTGs of measuring and the values (Z of next GTG (B8) of this GTG of blueness (B7) of target
B8') then between the values (Z of blue corresponding two GTGs of measuring (B4 and B5)
B4And Z
B5) between.Insert look-up table with the blueness of target by corresponding GTG value (being illustrated in figure 7 as 0) to corresponding GTG value (being illustrated in figure 7 as 20) the line taking sexual intercourse of next GTG (B8) of this GTG (B7) of minimum gray (B0) this moment, and therefore (namely the correction data 0,2,5,8,10,12,15,18,20 of blueness the 0th～8 rank GTG (B0～the B8)) look-up table of inserting can be a linear relationship to blueness (B) field the 0th～8 rank GTG as shown in Figure 7.
In addition, the present invention can be stored in the tristimulus values of each GTG of the resultant measurement of step S11 and trichromatic tristimulus values the storage device (as EEPROM) in the display, other step (as S12, S13, S2 and S3) then realizes with the software formula and can be carried out by the processor in the display, so can significantly reduce for the space that stores color correction data, and can adjust gamma value (γ) and the colour temperature pattern (x and y) of display arbitrarily.
In sum, the present invention calculates the corresponding look-up table that display color is proofreaied and correct that is used for because adopting the display characteristic according to measured display, to reach colour temperature and the brightness curve that sets, overcome the problem that prior art utilizes yield value and reference value to produce, and increase the accuracy of colour temperature and brightness adjustment and shorten the time of adjusting, to reduce the expenditure of cost.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. one kind is used for the look-up table production method that display color is proofreaied and correct, and it is characterized in that described method comprises:
Each GTG and three primary colors that measurement shows respectively on display device screen, obtain tristimulus values and the described trichromatic tristimulus values of described each GTG, wherein, the tristimulus values of described each GTG are that minimum gray is distinguished corresponding XYZ values to maximum gray, and described trichromatic tristimulus values are the three primary colors maximum gray XYZ values of correspondence respectively;
According to the tristimulus values of each GTG of measuring and the trichromatic tristimulus values of measurement, calculate the values of each GTG of three primary colors of measurement, wherein, the values of described each GTG of three primary colors is X values, Y values or the Z values of three primary colors minimum gray to three primary colors maximum gray difference correspondence;
According to the tristimulus values of the maximum gray of the color temperature value of target and measurement, calculate the high-high brightness of target;
According to the high-high brightness of target, the color temperature value of target and the gamma value of target, calculate the tristimulus values of each GTG of target;
According to the tristimulus values of each GTG of target and the trichromatic tristimulus values of measurement, calculate the values of each GTG of three primary colors of target;
When the values of a certain GTG of a certain primary colors of target is between the values of corresponding two GTGs of measuring of this primary colors, utilize the values of this this GTG of primary colors that interpolation method calculates target in the GTG value that between corresponding two GTGs of this primary colors of measuring, corresponds to, the GTG value of this GTG correspondence of this primary colors of target is inserted look-up table; And
When a certain primary colors of target by minimum gray to the values of a certain GTG all not when the values of next GTG of this this GTG of primary colors of target between the values of corresponding two GTGs of measuring of this primary colors is then between the values of corresponding two GTGs of measuring of this primary colors, this primary colors of target is inserted look-up table by minimum gray to the GTG value line taking sexual intercourse of next GTG correspondence of this GTG.
2. the look-up table production method of proofreading and correct for display color as claimed in claim 1 is characterized in that the described values that calculates each GTG of three primary colors of measurement also comprises:
According to the tristimulus values of the maximum gray of measuring and the trichromatic tristimulus values of measurement, the tristimulus values of each GTG of correcting measuring; And
The tristimulus values that replace each GTG of described measurement with the tristimulus values of each GTG of the measurement of proofreading and correct.
3. the look-up table production method of proofreading and correct for display color as claimed in claim 1 is characterized in that, the GTG value of described this GTG correspondence of this primary colors with target is inserted look-up table, also comprises:
The GTG of this GTG correspondence of this primary colors of target is on duty with a gain and add a side-play amount and the GTG value of this GTG correspondence of this primary colors of the target that obtains revising; And
The GTG value that replaces this GTG correspondence of this primary colors of described target with the GTG value of this GTG correspondence of this primary colors of the target revised.
4. the look-up table production method for the display color correction as claimed in claim 1 is characterized in that described three primary colors comprise redness, green and blue.
5. the look-up table production method for the display color correction as claimed in claim 1 is characterized in that, xyY, the Luv or the Lab that derive with the XYZ values replace described tristimulus values.
6. the look-up table production method for the display color correction as claimed in claim 1 is characterized in that display comprises LCD or LCD TV.
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