CN101694768A - Backlight adjustment calculation method - Google Patents
Backlight adjustment calculation method Download PDFInfo
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- CN101694768A CN101694768A CN200910207302A CN200910207302A CN101694768A CN 101694768 A CN101694768 A CN 101694768A CN 200910207302 A CN200910207302 A CN 200910207302A CN 200910207302 A CN200910207302 A CN 200910207302A CN 101694768 A CN101694768 A CN 101694768A
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Abstract
The invention provides a backlight adjustment calculation method which comprises the following steps: obtaining an average image load of picture grayscale summation by adding all pixel values of a picture at a subsection to obtain a numeric value which is then divided by the maximal grayscale value summation of the subsection; determining a limited lowest backlight grayscale value corresponding to a smallest image load and a limited highest backlight grayscale value corresponding to a largest image load; and determining a gradient parameter according to the smallest image load, the limited lowest backlight grayscale value, the largest image load and the limited highest backlight grayscale value, and obtaining a required backlight adjustment limitation curve according to the gradient parameter. The backlight adjustment calculation method can adopt different backlight adjustment limitation curves according to different modes or pictures, can not sacrifice a small amount of bright spot parts with high grayscale, and can express the picture efficiency in a higher degree.
Description
[technical field]
The invention relates to a kind of backlight adjustment calculation method, and particularly adjust calculation method relevant for a kind of high dynamic range LCD backlight.
[background technology]
Present high dynamic range display technique is made up of with optical texture between the two a light source, two modulators.When GTG value backlight can the zone or during universe control, except that the dynamic range of display or contrast can increase, also can save power consumption.But when the backlight gray scale value is adjusted according to result of calculation, contrast improves and picture distortion meeting takes place simultaneously, this is the problem that needs to accept or reject (trade-off) always, and according to different picture data inputs, the usefulness that shows (performance) can be different.
Generally speaking, the relation that the picture element GTG value summation of the backlight gray scale value of decision subregion control and this subregion on average can being aligned.Picture element GTG value summation is average, and with image load (Image Loading) (being the bright degree of picture) expression, for example complete white picture is 100% image load at this, and relative complete black picture is 0% image load.At present with deciding the mode of each subregion backlight gray scale value to have three kinds: first kind is the mean value (as shown in Figure 1a) that utilizes all picture element values of this subregion; Second kind is the mean value that first kind of mode calculated, and strengthens (shown in Fig. 1 b) with opening radical sign; And the third proposed afterwards, probability density function (Probability Density Function with picture, being called for short PDF) to be used as mapping function (Mapping Function) be the method (as shown in Figure 2) that axle comes mirror again with y=x for the cumulative distribution function (Cumulative Distribution Function is called for short CDF) of accumulation gained.
With original image shown in Figure 3 is example, determines with above-mentioned three kinds the image of the mode gained of each subregion backlight gray scale value shows it is respectively Fig. 4 a, and Fig. 4 b and Fig. 4 c with the original image enlarged drawing comparison of Fig. 4 d, can find out that the bright spot of the high gray of a little quantity becomes dull.
Therefore be necessary to propose a kind of backlight adjustment calculation method, overcome above-mentioned shortcoming.
[summary of the invention]
Fundamental purpose of the present invention is to provide a kind of backlight adjustment calculation method, and it can reach better image quality and more energy-conservation under different image modes.
For reaching aforementioned purpose of the present invention, the invention provides a kind of backlight adjustment calculation method and comprise: all picture element values of a subregion picture are added up divided by the maximum gray value summation of this subregion again, obtain picture GTG summation average image load; An one restriction lowest backlight GTG value restriction the highest backlight gray scale value corresponding of decision smallest image load correspondence with largest image load; And according to smallest image load correspondence, restriction lowest backlight GTG value, largest image load is corresponding and the highest backlight gray scale value of restriction determines a Slope Parameters, obtains needed adjustment restrictive curve backlight by this Slope Parameters.
Compared to the method for prior art, backlight adjustment calculation method of the present invention can be according to different mode or picture and is adopted different adjustment restrictive curves backlight, can not sacrifice the bright spot part of the high gray of a little quantity, more can show picture usefulness (performance).
For foregoing of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
[description of drawings]
Fig. 1 a and Fig. 1 b are the average proportionate relationship figure of picture GTG summation of two kinds of existing backlight adjustment calculation methods.
Fig. 2 is the average proportionate relationship figure of picture GTG summation of another kind of existing backlight adjustment calculation method.
Fig. 3 is an original image.
Fig. 4 a, Fig. 4 b and Fig. 4 c are respectively the image of original image shown in Figure 3 through existing deciding means gained backlight.
Fig. 4 d is the enlarged drawing of original image shown in Figure 3.
Fig. 5 is the image of original image shown in Figure 3 through backlight adjustment calculation method gained of the present invention.
Fig. 6 a to Fig. 6 d is the different mode that obtains through backlight adjustment calculation method of the present invention or the adjustment restrictive curve backlight of picture.
[embodiment]
But backlight adjustment calculation method of the present invention is at the high dynamic range displays of Region control backlight illumination, adjust restrictive curve based on different images, further after this parameter of curve restriction, obtain the restriction of minimum brightness and high-high brightness backlight gray scale value, can obtain needed adjustment restrictive curve backlight.Therefore can adopt different adjustment restrictive curves backlight according to different mode or picture.
Shown in Fig. 6 a, in a better embodiment of the present invention, the inventive method may further comprise the steps:
All picture element values of this subregion picture are added up divided by the maximum gray value summation of this subregion again, obtain a picture GTG summation average (being image load (Image Loading));
One restriction lowest backlight GTG value Min_BL of decision smallest image load Min_IL correspondence, a restriction the highest backlight gray scale value Max_BL corresponding with decision largest image load Max_IL; And
According to smallest image load correspondence, restriction lowest backlight GTG value, largest image load correspondence and the highest backlight gray scale value of restriction, calculate a slope (slope) parameter, limit by adjustment this Slope Parameters, to obtain needed adjustment restrictive curve backlight, the reference frame that this adjustment restrictive curve backlight is the backlight gray scale value can be applied to arbitrarily in each pattern picture.Wherein adding up of picture element value can be the mean value of all picture elements in each backlight subarea, the maximal value or the middle number of all picture elements ... or the like various can be by the characterisitic parameter that obtains in the probability density function of picture (Probability Density Function is called for short PDF).Backlight adjustment calculation method of the present invention also comprises: add that dynamic adjustment mechanism is applied to each situation.
Because this adjustment restrictive curve backlight can be used as the reference frame of backlight gray scale value, so, just can be applied to arbitrarily (for example shown in Fig. 6 a to Fig. 6 d) in each different pattern picture by changing the slope of this adjustment restrictive curve backlight; That is, thereby the picture effect that method of the present invention obtains wanting with the curve that obtains Different Slope with different parameters decision lowest backlight GTG value and the highest backlight gray scale value.Method of the present invention can also be detected number district picture, dynamically changes the modulation effect.
Compare with Fig. 1 a, Fig. 1 b and prior art shown in Figure 2, the advantage of backlight adjustment calculation method of the present invention is:
(1) backlight gray scale value curve can be adjusted restriction, and Fig. 1 a, Fig. 1 b and existing backlight adjusting method shown in Figure 2 are unrestricted.
(2) for the special frame patterns such as bright spot of a spot of high gray value, can possess certain brightness, improve the outer picture usefulness (performance) that also increases of contrast.
(3) can limit the effect that different curves backlight obtains wanting by simple parameter (being Slope Parameters) adjustment.
(4) can add that also dynamic adjustment mechanism is applied to each situation.
To sum up, backlight adjustment calculation method of the present invention is adjusted picture GTG summation average image load with parameter, to the curve of backlight value, to curve modulation and restriction to some extent, keeps different GTGs to reach better image quality at specific picture.For example: set smallest image load Min_IL and the minimum backlight gray scale value Min_BL that accepts thereof, a little the high gray bright spot that is desirably in the black picture has the corresponding brightness of accepting.
Be different from Fig. 1 and existingly on average become a proportionate relationship according to picture GTG summation to shown in Figure 3, backlight adjustment calculation method of the present invention can be according to different mode or picture and is adopted different adjustment restrictive curves backlight, can not sacrifice the bright spot part of the high gray of a little quantity, more can show picture usefulness (performance).
Claims (8)
1. backlight adjustment calculation method, it is characterized in that: this method comprises:
All picture element values of one subregion picture are added up divided by the maximum gray value summation of this subregion again, and it is average to obtain picture GTG summation;
The restriction lowest backlight GTG value of decision smallest image load correspondence, the highest backlight gray scale value of the restriction corresponding with largest image load; And
According to smallest image load correspondence, restriction lowest backlight GTG value, largest image load correspondence and the highest backlight gray scale value of restriction, calculate a Slope Parameters, obtain needed adjustment restrictive curve backlight by this Slope Parameters.
2. backlight adjustment calculation method as claimed in claim 1 is characterized in that: obtain the backlight gray scale value by adjustment restrictive curve backlight.
3. backlight adjustment calculation method as claimed in claim 1 is characterized in that: adding up of picture element value can be the mean value of all picture elements in each backlight subarea, the maximal value or the middle number of all picture elements ... or the like the various characterisitic parameters that obtain in can probability density function by picture.
4. backlight adjustment calculation method as claimed in claim 1 is characterized in that: this backlight adjustment calculation method also comprises: add that dynamic adjustment mechanism is applied to each situation.
5. backlight adjustment calculation method as claimed in claim 1 is characterized in that: this backlight adjustment calculation method also comprises: detect several subregion pictures, dynamically change the modulation effect.
6. backlight adjustment calculation method as claimed in claim 1 is characterized in that: but this method is the high dynamic range displays at the Region control backlight illumination.
7. backlight adjustment calculation method, it is characterized in that: this method comprises:
According to different mode or picture, adopt different images to adjust the backlight gray scale value that restrictive curve decides every district; With parameter decision lowest backlight GTG value and the highest backlight gray scale value, determine corresponding backlight gray scale value with slope curve again;
And detecting number district picture, dynamically change the modulation effect.
8. backlight adjustment calculation method as claimed in claim 7 is characterized in that: but this method is the high dynamic range displays at the Region control backlight illumination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200910207302A CN101694768A (en) | 2009-10-15 | 2009-10-15 | Backlight adjustment calculation method |
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| CN200910207302A CN101694768A (en) | 2009-10-15 | 2009-10-15 | Backlight adjustment calculation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014279A (en) * | 2010-12-20 | 2011-04-13 | 杭州华三通信技术有限公司 | Method and device for intensifying video image contrast |
| CN105632411A (en) * | 2014-10-29 | 2016-06-01 | 新相微电子（开曼）有限公司 | LCD backlight adjustment control method and LCD backlight adjustment control device based on image load analysis |
| CN110164385A (en) * | 2019-05-31 | 2019-08-23 | 厦门天马微电子有限公司 | A kind of adjusting method of back light source brightness |
-
2009
- 2009-10-15 CN CN200910207302A patent/CN101694768A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014279A (en) * | 2010-12-20 | 2011-04-13 | 杭州华三通信技术有限公司 | Method and device for intensifying video image contrast |
| CN102014279B (en) * | 2010-12-20 | 2012-10-03 | 杭州华三通信技术有限公司 | Method and device for intensifying video image contrast |
| CN105632411A (en) * | 2014-10-29 | 2016-06-01 | 新相微电子（开曼）有限公司 | LCD backlight adjustment control method and LCD backlight adjustment control device based on image load analysis |
| CN105632411B (en) * | 2014-10-29 | 2020-04-14 | 新相微电子(上海)有限公司 | Control method and device for LCD backlight adjustment based on image load analysis |
| CN110164385A (en) * | 2019-05-31 | 2019-08-23 | 厦门天马微电子有限公司 | A kind of adjusting method of back light source brightness |
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Application publication date: 20100414 |