CN100351895C - Method for regulating display color of display device - Google Patents

Abstract

The invention discloses a display color adjustment method of a display device, which divides each pixel of an input image signal into corresponding brightness levels; adjusts six primary colors of a display device at different brightness levels, and the six primary colors The primary colors are composed of red, green, and blue primary colors and three new primary colors. The three new primary colors are produced by pairing the three primary colors according to a fixed color matching ratio. When adjusting one of the new primary colors That is, it is equivalent to simultaneously adjusting the corresponding two primary colors according to the fixed ratio. The beneficial effects of the present invention are: the six primary colors are used for adjustment, and since three new primary colors are added between the primary colors, when the display device is calibrated, it is difficult to judge which primary color should be adjusted. The middle color can be adjusted by using the new primary color. This fine-tuning method is more in line with people's visual habits, and the adjustment of the abstract nonlinear curve becomes intuitive and precise.

Description

Method for adjusting display color of display device

【Technical field】

The invention relates to a television image processing technology, in particular to a display color adjustment method of a display device.

【Background technique】

In recent years, the development of digital TV broadcasting has been very rapid. The United States, Japan, Europe and other developed countries have entered the stage of fully implementing digital TV broadcasting. The United States is not only committed to increasing high-definition digital TV programs, but also decided to completely stop broadcasting analog TV, while many large and medium-sized cities in my country have launched cable high-definition digital TV, and at the same time, it is determined that analog TV will be completely stopped in 2015. Since the transmission of digital TV will hardly damage the program quality, the user can get the signal quality almost equal to that of the studio at home. However, the TVs currently on the market (especially TVs using new display devices, such as LCDTV, PDPTV, DLPTV...), cannot display with high quality due to various problems.

Most of the color display devices display different proportions of red, green, and blue by the three primary color red, green, and blue display units of additive color mixing, and then use the characteristics of the human eye to realize spatial color mixing to achieve color image display. That is to say, the input signal of the display device is the three primary color signals of red, green and blue. For decades, in order to improve the quality of TV images, the industry has continuously improved the "three primary colors" imaging and processing technology, and has made great progress. In color TV manufacturing enterprises, due to fierce market competition, the same model often needs to be matched with different display screens, but different display screens have different characteristics, such as the color reproduction range, so if you want to keep the white balance of the factory products consistent, you must Calibration, sacrificing the color reproduction range of some displays for white balance consistency. For a long time, the method adopted for the above-mentioned adjustment is to adjust the three primary colors of red, green, and blue of the display device separately, usually by adjusting their corresponding gamma correction curves. However, due to the non-linearity of the photoelectric characteristics of the display device, and the difficulty of visually correlating and judging the relationship between the adjustment of the three primary colors and the rich color changes of the picture, it is difficult to take into account the accuracy of color reproduction at all levels of brightness and the overall whiteness of the adjustment method. Due to the balance problem, the display device cannot achieve an ideal picture effect.

【Content of invention】

The technical problem to be solved by the present invention is to provide an intuitive and effective method for adjusting and compensating the color reproduction deviation of the display device.

In order to achieve the above object, the technical scheme adopted in the present invention is that the adjustment method of the display color of the display device divides each pixel of the input image signal into corresponding brightness levels; The primary colors are adjusted respectively. The six primary colors are composed of three primary colors of red, green and blue and three new primary colors. When one of the new primary colors is adjusted, it is equivalent to simultaneously adjusting the corresponding two primary colors according to the fixed ratio.

Preferably, the three new primary colors are respectively: yellow produced by matching red and green according to the ratio of 50% each; cyan produced by matching green and blue according to the ratio of 50% each; A 50% ratio produces magenta.

The brightness level can be divided according to the brightness change capability of the display device; generally, it can be divided into 64 levels.

The present invention adopts the above-mentioned technical scheme, and the beneficial effects are as follows: 1) the six primary colors are used for adjustment, and three new primary colors between the primary colors are added, so that when the display device is calibrated, it is difficult to judge which should be corrected. Which primary color is used to adjust the intermediate color can be adjusted with a new primary color. This fine-grained adjustment method is more in line with people's visual habits, and the abstract nonlinear curve adjustment becomes intuitive and precise. 2) The colors produced by pairing the three primary colors in equal quantities are preferably new primary colors, because they are the complementary colors of the three primary colors (yellow is the complementary color of blue, cyan is the complementary color of red, and magenta is the complementary color of green). Visually, the monotonous primary colors are enriched, so that the adjustable primary colors cover a wide color range, and there is a sharp contrast and difference with the existing primary colors, making it easier to select the primary colors that should be adjusted. 3) The brightness level is divided into 64 levels, fully considering the difficulty of adjustment brought by too fine grading and has little effect on visibility, and the adjustment is not accurate enough caused by too coarse grading, it is a more appropriate number of grading levels .

Below by embodiment and in conjunction with accompanying drawing, the present invention is described in further detail:

【Instructions attached】

Figure 1 is the Munsell colorimetric system.

Figure 2 is an illustration of Newton's color circle and its prediction discussion.

Fig. 3(a)-(c) are effect diagrams of a group of test pictures displayed on the display device after conventional adjustment.

FIGS. 4( a ) to ( c ) are effect diagrams of the test picture shown in FIG. 1 displayed on the display device after six primary colors are calibrated.

【Detailed ways】

The display color adjustment method of the display device divides each pixel of the input image signal into a corresponding brightness level, and the brightness level is divided according to the brightness change capability of the display device, generally speaking, it can be divided into 64 levels; in different On the brightness level, the six primary colors of the display device are adjusted respectively, and the six primary colors are composed of three primary colors of red, green, and blue (R=Red, G=Green, B=Blue) and three new primary colors. The basic colors are: red and green are combined according to the proportion of 50% each to produce yellow (Y=Yellow); green and blue are combined according to the proportion of 50% to produce cyan (C=Cyan); The magenta (M=Magenta) produced by matching the ratio of 50%, when adjusting one of the new primary colors, is equivalent to simultaneously adjusting the corresponding two primary colors according to the fixed ratio.

The principle of color adjustment using the above method is that each pixel contains three signals of hue, saturation, and brightness. This is the source of the 3D concept, which can be expressed as Munsell chroma A point in the system (Munsell Color System, shown in Figure 1). The vertical axis in Figure 1 represents brightness, which can be divided into multiple levels from dark to bright, and the cross-section of each brightness level is the Newtonian color circle, as shown in Figure 2. From the center to the circumference of the Newtonian color wheel, the saturation increases sequentially, while along the circumference of the ring, the hue changes among the three primary colors of red, green and blue. The relationship between various colors and primary colors follows the following predictions: 1. The color represented by the connecting line of two primary colors is considered to be the mixed color of the two primary colors, for example: equal amounts of green and red produce yellow a, which is yellow The saturation of cyan is lower than the saturation of its endpoint, because this point is closer to the center point; 2. The same amount of red and its complementary color cyan can be mixed to obtain white or monochromatic gray, while a little more red produces low saturation 3. The color c produced by mixing blue and spectral color b in an appropriate proportion can be considered as perceptually equivalent to spectral color d with the same hue but with slightly lower saturation.

It can be seen from Figure 2 that the three primary colors have a wide range of overtones. For a color that is not close to the three primary colors, it is difficult to intuitively judge which primary color needs to be adjusted to achieve the purpose of adjusting it. After adding a new base color, the comparison and selection become more intuitive and precise.

In the above process of adjusting the six primary colors separately, the standard picture comparison method can be used, and a sufficient number of standard pictures with sufficient color details and brightness levels can be selected as the basis for adjustment, and the displayed image can be compared with the standard picture , find out the unsatisfactory color on each brightness plane, judge which primary color it is closest to, and then enhance or weaken the corresponding primary color, and repeat the above-mentioned process of judging and correcting. In the actual operation process, the conventional R/G/B gamma curve correction and white balance adjustment can be used first, and then the six primary colors can be used for further color correction. Since the above adjustment process is a fine adjustment of color deviation, the operation of each of the six primary colors can be approximately regarded as independent, for example, the enhancement or weakening of the yellow primary color does not affect the other five primary colors of the display screen (Although in fact, the two primary colors of red and green are enhanced or weakened by half at the same time, but from the perspective of human vision, since the adjustment of the primary colors is halved, so for pure red or near red and The influence of pure green and near-green color is almost imperceptible, but only has a relatively obvious effect on pure yellow or near-yellow color), so the adjustment in this way has an intuitive and precise effect.

In the foregoing embodiment, the colors produced by matching the three primary colors in equal quantities in pairs are selected as new primary colors, because they are the complementary colors of the three primary colors (yellow is the complementary color of blue, cyan is the complementary color of red, and magenta is green. Complementary color) can visually enrich the monotonous primary color, make the adjustable primary color cover a wide color range, and have sharp contrast and difference with the existing primary color, making it easier to select the primary color that should be adjusted. It is also possible to adjust the formation ratio of the new base color, as long as it can meet people's visual habits and play a role in enriching and adjusting the base color. It is even possible to increase the number of new primary colors, but since the newly added primary colors are always a fixed ratio of two primary colors, too many primary colors will also cause cumbersome and confusing adjustments, so the number of six primary colors is more appropriate.

Comparative experiment: Select the S42SD-YD05 plasma module produced by Samsung SDI as the display device to be adjusted

1. First perform R/G/B gamma curve correction and white balance adjustment on this display device according to the conventional calibration method, and then display a group of test pictures on the device after the above conventional calibration. The obtained images are shown in the figure 3 (a) ~ (c) shown.

2. Carry out color adjustment on the display device according to the method of the present invention, reproduce the above test picture on the adjusted display device, and the obtained images are shown in Figure 4(a)-(c). Comparing Figure 3(a) and Figure 4(a), it can be seen that the picture displayed after the six primary colors is adjusted, the blue sky is bluer, and the grass is greener; it can be seen from Figure 3(b) and Figure 4(b) , the image is brighter and more transparent; as can be seen from Figure 3(c) and Figure 4(c), the glow is more brilliant.

Claims (4)

1, a kind of method of adjustment of display color of display device is gone into corresponding brightness degree with each pixel branch of input image signal; Six-basic-color to display device on different brightness degrees is adjusted respectively, described six-basic-color is made up of Red Green Blue and three new primary colours, these three new primary colours are three primary colors to be arranged in pairs or groups respectively in twos according to fixing color matching ratio produce, and are equivalent to two kinds of primary colors of its correspondence are adjusted simultaneously according to described fixed proportion when one of described new primary colours are adjusted.

2, the method for adjustment of the display color of display device according to claim 1 is characterized in that: described three new primary colours are respectively: red, the green yellow that produces according to the ratio collocation that respectively accounts for 50%; Green, the blue cyan that produces according to the ratio collocation that respectively accounts for 50%; Red, the blue magenta that produces according to the ratio collocation that respectively accounts for 50%.

3, the method for adjustment of the display color of display device according to claim 1 and 2 is characterized in that: described brightness degree is divided according to the brightness changing capability of display device.

4, the method for adjustment of the display color of display device according to claim 3 is characterized in that: it is 64 grades that described brightness degree is divided into.

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