A real time processing method and real time processing circuit for color domain mapping

Abstract

The invention relates to a color domain mapping real-time processing method and a real-time processing circuit, wherein the processing method comprises: (1) separately storing the representing color data to four groups of searching table memories; (2) inputting to-be-rectified original color data, selecting four grid points in the original color space in accordance with the original color data, and decoding for acquiring the memory addresses of the four grid points; (3) finding the representing rectified color data of the four grid points in accordance with the memory addresses; and (4) carrying out interpolation calculations by using the algorithm of tetrahedron interpolating in accordance with the representing rectified color data of the four grid points and the input to-be-rectified original color data, so as to acquire the final rectified color data. The processing circuit comprises an address decoder, four groups of searching table memories and an interpolation circuit. In comparison with prior art, the invention combines the color mapping searching table with the tetrahedron interpolation algorithm, saves hardware resource, increases work efficiency, and thus effectively increases calculation speed.

Description

Technical field [0001] The present invention belongs to the field of color signal processing. Specifically, the present invention relates to a color gamut mapping processing method and processing circuit. Background technique [0002] Currently, there are many types of display devices on the market. In order to achieve color matching between display devices with different color gamuts and color characteristics, people study various color gamut mapping methods. In terms of hardware processing, color gamut mapping can be realized by combining a color mapping lookup table and three-dimensional interpolation. The method mainly includes three steps: packing, decimation, and interpolation. Among them, packing refers to the three-dimensional grid discrete sampling of the original color space; the original data corresponding to the sampling grid points is called the representative original color data, and the corrected color data corresponding to these original data (different types of d...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the trilinear interpolation algorithm needs to perform iterative interpolation calculations on eight points, which requires a large amount of calculation and consumes a lot of hardware resources, so it also limits the maximum allowable operating frequency - in the FPGA chip of xilinx company Experiments on SpartanIII xc3s400 show that the circuit realized by combining eight sets of one-dimensional lookup tables and trilinear interpolation proposed by Dongil Han has a maximum operating frequency close to 60M Hz

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