Device and method for processing run-length encoded signals by u

Details Device and method for processing run-length encoded signals by u Device and method for processing run-length encoded signals by u

1994-12-16

2000-10-17

Johns, Andrew W.

Image analysis

Image compression or coding

Including details of decompression

382246, G06K 936

Patent

active

061343498

ABSTRACT:
Multiplications in an inverse quantization portion (202) are limited to only multiplications of an effective coefficient (NZ) by a quantization coefficient (Qi) corresponding thereto. An inverse zigzag transform is performed such that fixed values "0", the number of which corresponds to a block of Huffman codes, are previously arranged and the effective coefficient (NZ) is then overwritten in corresponding positions, rather than arranging data including the fixed values "0" and the effective coefficient (NZ). Thus, multiplications of ineffective coefficients are not required and the Huffman codes are decoded at a high speed.

REFERENCES:
patent: 4939583 (1990-07-01), Tsuboi et al.
patent: 5142380 (1992-08-01), Sakagami et al.
patent: 5184229 (1993-02-01), Saito et al.
patent: 5416854 (1995-05-01), Fukuda et al.

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