CN100574464C - Set up the method and the device thereof of the gray value-brightness curve of display fast - Google Patents

Abstract

After a kind of method of setting up the gray value-brightness curve of display fast, the part gray value by obtaining a display and corresponding brightness value, after substitution one formula operation, the variable in the formula is separated divided by obtaining one gray value-brightness curve.

Description

Set up the method and the device thereof of the gray value-brightness curve of display fast

Technical field

The present invention relates to set up the method and the device thereof of the gray value-brightness curve of display.

Background technology

Gray value-the brightness curve of a display is meant the relation curve of the pairing brightness of different gray values, gray scale is worked as the x axle, brightness is when the y axle, the curve that comes that draws is called " gray value-brightness curve ", because gray value-brightness curve equals the gamma curve (Y=X^r of mathematics generally, γ curve, gammacurve), so gray value-brightness curve is called gamma curve again.

Each manufacturing display " gray value-brightness curve " that comes out is not necessarily identical, if therefore the requirement of the high-quality unification of display product, each display all should measure its " gray value-brightness curve ", manufacturing person has had display " gray value-brightness curve " afterwards, just know the characteristic of display, set or the like with the color of further adjustment display.

Existing patent of invention (is the method for adjustment and the system of television indicator, SYSTEM AND METHOD FORPANEL DISPLAY TELEVISION ADJUSTMENT, JP patent No.2005057543, USpatent No.6043797, TW patent No.00583624) use a system measurements plane to show the brightness (brightness) of TV, show that to carry out the plane γ of TV compensates correction.

But the method for measurement of this system, be to play the gray scale signal one by one to LCD TV via computer (PC), capture brightness (brightness) related data of flat-panel screens one by one by photodetector (light detector), all data are back to computer (PC) handle voltage-brightness curve (the corresponding brightness distribution curve of voltage) to obtain flat-panel screens.If play the pattern signal to display via pattern generator, measure via photodetector (light detector) again data are reached computer (PC), a circulation like this spends a second, if will obtain red green blue tricolor and the white Continuous Gray Scale value-brightness curve of 8bit, so will spend about 1 (second) * 256 (individual gray scale) * 4 (primary colors) on measuring is 17 minutes, and owing to each work station time of staying on the plant produced line is of short duration, if this plane will be shown the γ compensation correction of TV is applied on the plant produced line, will certainly be because of on measuring, costing a lot of money the time, so that be difficult on the plant produced line, implement the γ compensation correction that real-time plane shows TV.

Therefore " gray value-brightness curve " how to obtain display fast needs.

Summary of the invention

Method of the present invention is the brightness value that measures by the gray value of obtaining the display part and corresponding amount, and the formula of substitution the present invention development is to set up the gray value-brightness curve of display.Because the present invention only needs the gray value and the corresponding brightness value of part, thus the measurement time shorten and be suitable for producing the use of online reality.

Method of the present invention comprises the following steps:

Steps A: obtain n group (t at least _j, Y _j) value, wherein:

j＝1～n，4≤n≤30；

t _jBe j gray value;

Y _jRepresent in j gray value (t _j) the corresponding brightness value that measured when being shown on this display;

Step B: with n group (t _j, Y _j) value brings at least one formula, wherein this at least one formula comprises one first formula:

$Y_j=\frac{L_{\max }}{(1+e^{a-f\left(t_j\right)})}$

Wherein:

L _MaxHigh-high brightness in the gray value-brightness curve of display for this reason;

A is a parameter;

F (t) is the function of t, and wherein f (t) comprises the variable of plural number; And

Step C:, represent this gray value-brightness curve in the hope of first formula by the calculating of step B value in the hope of each variable.

According to embodiments of the invention,

$f\left(t_j\right)=[\underset{j=1}{\overset{n-k}{\mathrm{\Σ}}}{c}_j*t_{\max }*{\left(\frac{t}{t_{\max }}\right)}^{r_j}];$ Or

$f\left(t_j\right)=b\×[\underset{j=1}{\overset{n-k}{\mathrm{\Σ}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}];$

B wherein, c _jBe variable;

r _jBe parameter;

t _MaxBe maximum gradation value; And

0≤k≤2。

According to embodiments of the invention, also can also comprise one second formula in addition:

$\underset{j=1}{\overset{n-k}{\mathrm{\Σ}}}{c}_j=M;$

Wherein M is a parameter.

The present invention also comprises a kind of device of seeking gray value-brightness curve, is used for a color monitor, and the device of this searching gray value-brightness curve comprises:

One signal generator is imported this color monitor in order to the gray scale figure that produces n different gray values, and wherein n different gray values are defined as t _j, j=1～n, and 4≤n≤30;

One optical sensor is in order to acquisition each gray scale figure that color monitor presented;

One color analyzer, be connected with optical sensor with behind the image of obtaining color monitor to measure the pairing n of each a gray scale figure brightness value, wherein n brightness value is defined as Y _j, j=1～n, and 4≤n≤30;

One computer, be connected to obtain the color information of color monitor with color analysis instrument, this computer includes a processor and a memory, this memory comprises that computer software programs carry out for processor, wherein these computer software programs comprise the calculation program of representing one first formula, and this first formula is:

$Y_j=\frac{L_{\max }}{(1+e^{a-f\left(t_j\right)})}$

Wherein:

L _MaxHigh-high brightness in the gray value-brightness curve of display for this reason;

A is a parameter;

E is index (exponent);

F (t) is the function of t, and wherein f (t) comprises the variable of plural number;

This processor is carried out the value of these computer software programs in the hope of each variable, makes to represent this gray value-brightness curve with first formula.

Be shown with different embodiment about f (t) as above-mentioned, and can also comprise one second formula:

$\underset{j=1}{\overset{n-k}{\mathrm{\Σ}}}{c}_j=M$

Wherein M is a parameter.

Description of drawings

Fig. 1 is an environment for use schematic diagram of seeking the device of gray value-brightness curve.

Fig. 2 is the gamma curve schematic diagram of general mathematics.

Fig. 3 is the gray value-brightness curve schematic diagram of general display.

Fig. 4 is the S curve synoptic diagram of general mathematics.

Fig. 5 is that the present invention is about setting up the flow chart of gray value-brightness curve.

The reference numeral explanation

Seek the device 70 of gray value-brightness curve

Optical sensor 71

Color analysis instrument 72

Computer 73

Signal generator 74

Color monitor 90

Embodiment

Fig. 1 is the environment for use schematic diagram of the present invention about the device 70 of searching gray value-brightness curve.The device 70 of seeking gray value-brightness curve comprises optical sensor 71, one color analyzers, 72, one computers 73 and a signal generator 74.Signal generator 74 is in order to produce specific gray scale figure input color display 90, behind the image by optical sensor 71 acquisition color monitors 90, color analysis instrument 72 can measure the color information (colour temperature, brightness and the colourity that for example can comprise each gray scale) of color monitor 90 and these data are passed to computer 73 records again.

If according to existing method, signal generator 74 is an example for each color (red, green, blue and white) produces 0 to 255 gray scale figure, and then computer 73 only need write down does not need can obtain " gray value-brightness curve " through special computing.

But the present invention is in order to obtain " gray value-brightness curve " fast, 74 of signal generators can produce gray scale figure (such as 5 gray scale figures of part, can be the gray scale figure of red, green, blue and white, be noted that signal generator 74 can once produce a gray scale figure, perhaps once produce a plurality of gray scale figures), and color analysis instrument 72 measures the corresponding brightness of these gray scale figures again, and computer 73 calculates " gray value-brightness curve " of color monitor 90 again according to the numerical value of five groups of gray scales and brightness.

General gamma curve (gamma-curve) is described the gray value-brightness curve of display as Fig. 2, but, the gray value-brightness curve of the display of reality do not conform to because having partly with gamma curve (gamma-curve), and when high-order, may have the dashed region A of saturated phenomenon such as Fig. 3, make gamma curve (gamma-curve) be not enough to represent the gray value-brightness curve of real display.

But if adopt S curve (S-curve), the deficiency of gamma curve (gamma-curve) at gray scale high-order saturated phenomenon described though can replenish as Fig. 4, its mathematical formulae as shown in Equation 1, L wherein _MaxHigh-high brightness in the gray value-brightness curve of display for this reason, but the S curve can't correctly be described the gray value-brightness curve of low order gray scale.

$Y=\frac{{\mathrm{<figure-callout\; id="1"\; label="L\; max"\; filenames="C2007100018170016H1.png"\; state="\{\{state\}\}">L</figure-callout>}}_{\max }}{1+e^{a-\mathrm{bt}}}.........\left(1\right)$

Wherein t represents gray value, the Y representative luminance value, and a, b are parameter, e is index (exponent).

Below please refer to Fig. 5 about flow chart of the present invention, and understand feature of the present invention.

Step 501:

Obtain n group (t _j, Y _j) value, wherein:

j＝1～n，4≤n≤30；

t _jBe that (gray value that signal generator 74 produces j is t to j gray value _j);

Y _jRepresent in j gray value (t _j) the corresponding brightness value that measured when being shown on this display 90;

74 of signal generators of the present invention can produce the gray scale figure of part, so that obtain " gray value-brightness curve " fast.Traditional approach n is 256 (supposing to describe gray value with 8), and n of the present invention is at least 4 according to experiment, and n is big more certainly accurate more, but in order to obtain " gray value-brightness curve " fast, the maximum suggestion of n is 30.

Step 502:

With n group (t _j, Y _j) formula that developed of value substitution the present invention because the formula that the present invention developed has many change types, below with the general formula of formula 2 as the present invention's first formula.

$Y_j=\frac{L_{\max }}{(1+e^{a-f\left(t_j\right)})}.........\left(2\right)$

Wherein:

L _MaxHigh-high brightness in the gray value-brightness curve of display for this reason;

A is a parameter, and e is index (exponent);

F (t _j) be t _jFunction;

First embodiment:

According to the first embodiment of the present invention, f (t _j) be following formula 3

$f\left(t_j\right)=b\&times;[\underset{j=1}{\overset{n-1}{\mathrm{\&Sigma;}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}].........\left(3\right)$

That is first formula be formula 4:

$Y_j=\frac{L_{\max }}{\left\{{1+e}^{a-b[\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}]}\right\}}.........\left(4\right)$

K=1 wherein, b, c _jBe variable;

r _jBe parameter;

t _MaxBe maximum gradation value (such as 255);

First embodiment and needs one second formula, as shown in Equation 5:

$\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j=M.........\left(5\right)$

Wherein M is a parameter, such as M=1.

Such as t _Max=255, L _Max=255, n=5, M=1 are example, if make r ₁=1, r ₂=30, r ₃=0.18, r ₄=10, and five groups of brightness (t that measure the gray value correspondence _j, Y _j, j=1～5) and be (40,1), (140,50), (190,135), (220,170), (254,254).Five groups of measuring value substitution formula 4 (first formula) and formula 5 (second formula) can be tried to achieve following six variable value: a=18.297, b=-0.095, c ₁=0.07826, c ₂=0.19338, c ₃=0.72836, c ₄=0.01995.Be noted that because five groups of measuring value substitution formula 4 can form five conditions, formula 5 then is a condition, thus six conditions formed altogether, so can solve six variate-values.

Second embodiment:

With the maximum difference of first embodiment be not need formula 5, therefore will lack a condition, so the number of variable need lack one, this moment, first formula can change formula 6 into:

$Y_j=\frac{L_{\max }}{\left\{{1+e}^{a-b[\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}]}\right\}}.........\left(6\right)$

K=2 wherein.

With n=5 is example, then only needs C ₁～C ₃Variable does not need C ₄Variable, so the number of variable lacks one.

The 3rd embodiment:

With maximum different the locating of first embodiment is f (t _j) be following formula 7:

$f\left(t_j\right)=[\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}].........\left(7\right)$

K=1 wherein.

Owing to lacked variable b, therefore also do not needed formula 5.

The 4th embodiment:

With maximum different the locating of first embodiment is f (t _j) be following formula 8:

$f\left(t_j\right)=[\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}].........\left(8\right)$

K=0 wherein.

Owing to lacked variable b, but Duo a variable C than first embodiment _n, so formula 5 still needs.

Step 503:

Calculating by step 502 is represented " gray value-brightness curve " in the hope of first formula.

Because computer 73 comprises a processor 731 and a memory 732, therefore can calculate to obtain correct " gray value-brightness curve " by the software program that memory 732 stores as Fig. 3.

In sum; no matter the present invention all shows it totally different in the feature of prior art with regard to purpose, means and effect, and above-mentioned many embodiment give an example for convenience of explanation; protection scope of the present invention is as the criterion with claim of the present invention, but not only limits to the foregoing description.

Claims (18)

1. method of setting up the gray value-brightness curve of display fast, be part gray value and corresponding brightness value by obtaining a display to obtain one gray value-brightness curve, this method comprises the following steps:

Steps A: obtain n group (t _j, Y _j) value, wherein:

j＝1～n，4≤n≤30；

t _jBe j gray value;

Y _jRepresent in j gray value (t _j) the corresponding brightness value that measured when being shown on this display;

Step B: with n group (t _j, Y _j) be worth at least one formula of substitution, wherein this at least one formula comprises one first formula:

$Y_j=\frac{L_{\max }}{\left(1{+e}^{a-f\left(t_j\right)}\right)}$

Wherein:

L _MaxHigh-high brightness in the gray value-brightness curve of display for this reason;

A is a parameter;

E is an index;

F (t) is the function of t, and wherein f (t) comprises the variable of plural number; And

Step C:, make and represent this gray value-brightness curve with first formula by the calculating of step B value in the hope of each variable.

2. the method for setting up the gray value-brightness curve of display fast as claimed in claim 1, wherein:

$f\left(t_j\right)=[\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}];$

c _jBe parameter;

r _jBe parameter;

t _MaxBe maximum gradation value; And

0≤k≤2。

3. the method for setting up the gray value-brightness curve of display fast as claimed in claim 1, wherein:

$f\left(t_j\right)=b\&times;[\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}];$

B is a parameter;

c _jBe parameter;

r _jBe parameter;

t _MaxBe maximum gradation value; And

0≤k≤2。

4. the method for setting up the gray value-brightness curve of display fast as claimed in claim 2, wherein this at least one formula includes only one first formula, and k=1.

5. the method for setting up the gray value-brightness curve of display fast as claimed in claim 3, wherein this at least one formula includes only one first formula, and k=2.

6. the method for setting up the gray value-brightness curve of display fast as claimed in claim 2, k=0 wherein, and this at least one formula also comprises one second formula:

$\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j=M;$

Wherein M is a parameter.

7. the method for setting up the gray value-brightness curve of display fast as claimed in claim 6, wherein M=1.

8. the method for setting up the gray value-brightness curve of display fast as claimed in claim 3, k=1 wherein, and this at least one formula also comprises one second formula:

$\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j=M;$

Wherein M is a parameter.

9. the method for setting up the gray value-brightness curve of display fast as claimed in claim 8, wherein M=1.

10. a device of seeking gray value-brightness curve is used for a color monitor, and the device of this searching gray value-brightness curve comprises:

One signal generator is imported this color monitor in order to the gray scale figure that produces n different gray values, and wherein n different gray values are defined as t _j, j=1～n, and 4≤n≤30;

One optical sensor is in order to acquisition each gray scale figure that color monitor presented;

One color analyzer, be connected with optical sensor with behind the image of obtaining color monitor to measure the pairing n of each a gray scale figure brightness value, wherein n brightness value is defined as Y _j, j=1～n, and 4≤n≤30;

One computer, be connected to obtain the color information of color monitor with color analysis instrument, this computer includes a processor and a memory, this memory comprises that computer software programs carry out for processor, wherein these computer software programs comprise the calculation program of representing one first formula, and this first formula is:

$Y_j=\frac{L_{\max }}{\left(1{+e}^{a-f\left(t_j\right)}\right)}$

Wherein:

L _MaxHigh-high brightness in the gray value-brightness curve of display for this reason;

A is a parameter;

E is an index;

F (t) is the function of t, and wherein f (t) comprises the variable of plural number;

This processor is carried out the value of these computer software programs in the hope of each variable, makes to represent this gray value-brightness curve with first formula.

11. the device of searching gray value-brightness curve as claimed in claim 10, wherein:

$f\left(t_j\right)=[\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}];$

c _jBe parameter;

r _jBe parameter;

t _MaxBe maximum gradation value; And

0≤k≤2。

12. the device of searching gray value-brightness curve as claimed in claim 10, wherein:

$f\left(t_j\right)=b\&times;[\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j*t_{\max }*{\left(\frac{t_j}{t_{\max }}\right)}^{r_j}];$

B is a parameter;

c _jBe parameter;

r _jBe parameter;

t _MaxBe maximum gradation value; And

0≤k≤2。

13. the device of searching gray value-brightness curve as claimed in claim 11, wherein this at least one formula includes only one first formula, and k=1.

14. the device of searching gray value-brightness curve as claimed in claim 12, wherein this at least one formula includes only one first formula, and k=2.

15. the device of searching gray value-brightness curve as claimed in claim 11, k=0 wherein, and this at least one formula also comprises one second formula:

$\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j=M;$

Wherein M is a parameter.

16. the device of searching gray value-brightness curve as claimed in claim 15, wherein M=1.

17. the device of searching gray value-brightness curve as claimed in claim 12, k=1 wherein, and this at least one formula also comprises one second formula:

$\underset{j=1}{\overset{n-k}{\mathrm{\&Sigma;}}}{c}_j=M;$

Wherein M is a parameter.

18. the device of searching gray value-brightness curve as claimed in claim 17, wherein M=1.

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