Image signal coding method and apparatus, image signal transmiss

Details Image signal coding method and apparatus, image signal transmiss Image signal coding method and apparatus, image signal transmiss

1997-12-16

2000-03-21

Le, Vu

Television

Bandwidth reduction system

Data rate reduction

348407, 348699, 382236, H04N 732

Patent

active

060408650

ABSTRACT:
The present invention relates to an image signal coding apparatus and method, an image signal transmission method and a recording medium in which an input image signal is divided into a plurality of blocks and a reference image signal is used for carrying out a motion compensative prediction coding to each of the blocks. The present invention is characterized in that a reference image signal is used for each of the blocks to calculate: a motion vector prediction residue of a block for which a motion compensation is carried out; a residue of a block for which no motion compensation is carried out; and an average luminance value of pixel data within a block and a flatness value of the block. For each of the blocks, a magnitude of the aforementioned block motion vector prediction residue is compared to a magnitude of said block residue so that a result of this comparison is used to decide whether to carry out a motion compensation coding. In this process, the average luminance value and the flatness value of the block are used to switch between decision making region division types. According to a result of this decision, a motion compensative prediction coding is carried out for each of the blocks. Thus, even when a prediction residue is small on a flat portion of a image, it is possible to prevent generation of a fixed noise and improve the coding efficiency without deteriorating the image quality.

REFERENCES:
patent: 5029000 (1991-07-01), Colombo
patent: 5068724 (1991-11-01), Krause et al.
patent: 5506622 (1996-04-01), Kim
patent: 5799110 (1998-08-01), Israelsen et al.
patent: 5844612 (1998-12-01), Israelsen

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