Image decoder with block image shifting device

Details Image decoder with block image shifting device Image decoder with block image shifting device

1996-02-05

1998-02-03

Au, Amelia

Television

Bandwidth reduction system

Data rate reduction

348420, H04N 736

Patent

active

057150079

ABSTRACT:
An image decoder with a block image shifting device used for a movement compensating process in an image compression encoding/decoding system shifts image blocks each consisting of n.times.m pixels at a high speed in units of n pixels without using n to 1 selector circuits. When a movement compensation is carried out in each image block, a register stores a shift pixel number based on a movement vector. The image information read from a frame memory in units of n pixels is stored into a block buffer with selected bits masked by a mask pattern generating device in accordance with the shift pixel number to store unmasked bits into the block buffer. When reading the pixel data from the block buffer, the pixels are shifted according to a read address and the shift pixel number used to store the pixels into the block buffer. As a result, the output data from the block buffer is movement compensated without the use of the n to 1 selector circuits.

REFERENCES:
patent: 4307420 (1981-12-01), Ninomiya et al.
patent: 5276800 (1994-01-01), Wada
patent: 5430464 (1995-07-01), Lumelsky

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