US 5,177,608 A · Method and apparatus for coding moving image signal

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.

Claims30

Dependent claims

A method of coding a moving image signal, comprising the steps of:

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

6 more elements

An apparatus for coding a moving image signal, comprising:

forming means for detecting a change between a current frame and a previous frame in units of blocks obtained by dividing a frame constituted by an input moving image signal into a plurality of pixels, and forming a first valid block map in units of frames by determining valid and invalid blocks on the basis of the detected changes;
first weighting means for performing a first weighting operation of the formed first valid block map;
second weighting means for performing a second weighting operation of a fourth valid block map of the previous frame;
adding means for obtaining a weighted second valid block map by adding/synthesizing outputs from said first and second weighting means;
segmentation means for obtaining a third valid block map by performing predetermined segmentation of the second valid block map;
isolated invalid block removing means for obtaining a fourth valid block map by determining validity of an isolated invalid block output from said segmentation means by referring to neighboring blocks;
and
coding means for coding a valid block region output from said isolated invalid block removing means.

5 more elements

Dependencies are inferred from the claim text.

Method and apparatus for coding moving image signal

Life of this patent

Method and apparatus for coding moving image signal

Life of this patent

Abstract

Claims30