Image coding and decoding apparatus and methods thereof

Details Image coding and decoding apparatus and methods thereof Image coding and decoding apparatus and methods thereof

1996-10-23

2000-06-27

Rao, Andy

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

348415, 348402, H04N 712

Patent

active

060815515

ABSTRACT:
To achieve an image encoding apparatus that has extensibility by not limiting an image to be referenced, and that can reduce processing time satisfactorily if the processing of an ordinary frame is skipped, the apparatus of the present invention comprises: motion detecting means for detecting a motion vector for each block of a prescribed size from a reference image and an input image; weighted motion-compensation means for, based on the detected motion vector, extracting from the reference image an area of a prescribed size which is wider than the prescribed block size and which contains an area corresponding to each block of the input image, and for creating a predicted image for the input image by applying a predetermined weight to each of pixels in the wider area and by using the weighted pixels of the wider area; a predicted-image memory for storing the predicted image; encoding means for taking a residual between the stored predicted image and the input image, and for encoding the residual; and decoding means for decoding the encoded image data and thereby obtaining a reference image.

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