Color gamut expanding system and method

Abstract

The invention provides a color gamut expanding system comprising a signal input unit, a forward conversion unit, a color gamut expanding unit, an inverse conversion unit and a signal output unit; wherein, the signal input unit is used for inputting pixel color information; the forward conversion unit is used for converting the pixel color information into values of L, a and b in liner Lab color space; the color gamut expanding unit is used for receiving color gamut expanding coefficients, and expands the values of L, a and b provided by the forward conversion unit into new values of L, a and b in the linear Lab color space according to the color gamut expanding coefficients; the inverse conversion unit is used for converting expanded values of L, a and b into the pixel color information of a large color gamut; the signal output unit is used for outputting the color information of the large color gamut. The invention also provides a corresponding color gamut expanding method. The invention can realize continuous adjustment, has high calculation efficiency, can better avoid the phenomenon of hue deviation, and has higher precision and accuracy.

Description

technical field [0001] The invention relates to the display field, especially the color gamut expansion technology in the display field. Background technique [0002] A large color gamut display device can display more color content than the original display device, such as deeper red. However, the color gamuts of existing image color standards and video content adopting these color standards are small, so reproducing the video content with a display device with a large color gamut will not fully reflect the rich color display capability of the display device with a large color gamut. [0003] A feasible solution is to use color gamut extension technology, that is, to map the color gamut specified by the original color standard to the color gamut of a display device with a large color gamut. A common method for realizing such color gamut expansion in the prior art is to use a combination of three-dimensional look-up table and interpolation technology, which is also an impor...

AI Technical Summary

Problems solved by technology

Although the color gamut mapping method based on three-dimensional lookup table and interpolation has openness and certain flexibility, it also has the following deficiencies: 1) Because the types of color display effects are consistent with the number of three-dimensional lookup tables, due to three-dimensional lookup The number of tables is limited, and considering the cost, it will not be set too much, so the user's choice of color display effects is limited to a limited number of effects, which cannot achieve the purpose of continuous adjustment; 2) the versatility is not high, That is, the look-up table data corresponding to one display device cannot be well adapted to another display device; 3) a large amount of memory resources for storing the look-up table data will be occupied, thereby increasing the hardware cost; 4) and , as far as color gamut expansion is concerned, the user's perception of the color expansion effect mainly depends on the user's preference for the preferred color. kind of preference

The above-mentioned color difference signal is not defined in a uniform color space, so this kind of saturation adjustment device and method has low adjustment accuracy. If it is used for color gamut expansion, there will be obvious hue shift

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