System and method for color saturation reconstruction of television signal

Abstract

The present invention proposes a TV signal chroma reconstruction system, in which the luminance and chroma separation and color decoding device generates the luminance and color difference corresponding to the Kth pixel in the N+1th image line through the TV signal filtering. The first line buffer device temporarily stores the brightness of the Kth pixel in at least one adjacent image line before the N+1th image line. The second line buffer device temporarily stores the color difference of the Kth pixel in the Nth and N-1th image lines. The vertical similarity calculating device generates an upper similarity parameter and a lower similarity parameter according to the brightness corresponding to the Kth pixel in the N+1th and N−1th image lines. The reconstruction device uses the upper similarity parameter and the lower similarity parameter as weights to weight the color-difference signals of the N-1 and N+1-th image lines to obtain the reconstructed color-difference signal of the K-th pixel in the N-th image line. The invention also provides a television signal chroma reconstruction method, which can accurately reconstruct color difference signals in a SECAM television system.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a system for reconstructing the saturation of a SECAM television signal and a method for reconstructing the saturation of a SECAM television signal. Background technique [0002] figure 1 It is a schematic diagram of encoding a sequential color with memory (Sequential Color with Memory, SECAM) signal in the prior art. Such as figure 1 As shown, in the encoding of the SECAM signal, the chroma signal is represented by the color-difference signals DB and DR, and the color-difference signals DB and DR appear alternately on different scanning lines, that is, the scanning line order of the color-difference signals DB and DR is: One scan line replaces the color difference signal once. The color difference signal DB of the SECAM signal is generated by subtracting the luminance signal (Y) from the blue signal (B) in the RGB signal. Similarly, it is generated by subtracting the...

AI Technical Summary

Problems solved by technology

However, during the SECAM decoding process, since the SECAM encoding end generally does not undergo vertical low-pass filtering, but simply transmits the DB or DR signal at that time, the decoding end does not need to restore high-frequency components as in US Patent No. 5,844,617 , and the signal received by SECAM is not in 4:2:0 format

Therefore, the existing SECAM TV signal chroma reconstruction system still has many defects, and it is necessary to improve it.

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