System and method for color saturation reconstruction of television signal

Abstract

The invention provides a system for reconstructing chroma of a television signal, a brightness chroma separation and color decoding device in the system generates brightness and color difference corresponding to a Kth pixel in the (N+1)th image line via filtration of the television signal. A first line buffer device temporarily stores the brightness of the Kth pixel in at least one adjacent image line prior to the (N+1)th image line. A second line buffer device temporarily stores the color difference of the Kth pixel in the Nth and the (N-1)th image line. A vertical direction similarity calculation device generates, in accordance with the brightness corresponding to the Kth pixel in the (N+1)th image line and the (N-1)th image line, an upper similar parameter and a lower similar parameter. The reconstruction device implements weighting to color difference signals of the (N+1)th image line and the (N-1)th image line by taking the upper similar parameter and the lower similar parameter as weights, so as to obtain a reconstruction color difference signal of the Kth pixel in the Nth image line. The invention also provides a method for reconstructing chroma of a television signal, the color difference signal can be reconstructed precisely in a SECAM television system using the invention.

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. like 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 lu...

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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