Method and apparatus for coding moving image signal

Details Method and apparatus for coding moving image signal Method and apparatus for coding moving image signal

1991-09-20

1993-01-05

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358135, H04N 713

Patent

active

051776081

ABSTRACT:
According to a method and apparatus for coding a moving image signal, a change between a current frame and a previous frame is detected in units of blocks obtained by dividing a frame constituted by an input moving image signal into a plurality of pixels. A first valid block map is formed in units of frames by determining valid and invalid blocks on the basis of the detected changes. A first weighting operation of the formed first valid block map is performed. A second weighting operation of a fourth valid block map of the previous frame is performed. A weighted second valid block map is obtained by adding/synthesizing the first and fourth valid block maps respectively subjected to the first and second weighting operations. A third valid block map is obtained by performing predetermined segmentation of the second valid block map. A fourth valid block map is obtained by determining validity of an isolated invalid block in the third valid block map by referring to neighboring blocks. A valid block region of the fourth valid block map is coded.

REFERENCES:
patent: 4792851 (1988-12-01), Mochizaki
patent: 4809067 (1989-02-01), Kikachi et al.
patent: 4876595 (1989-10-01), Veldhuis
patent: 4996594 (1991-02-01), Murayama
Kenshi Dachiku et al., "A Color Motlon Videophone for the ISDN", National conference in Spring-Time of the Institute of Electronics Information and Communication Engineers (1989), pp. 7-215.

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