Image signal compressing device

Details Image signal compressing device Image signal compressing device

1997-05-12

1998-09-08

Boudreau, Leo H.

Image analysis

Image compression or coding

Lossless compression

382239, G06K 900

Patent

active

058057374

ABSTRACT:
An image signal compressing device has a quantization processing circuit in which DCT coefficients are quantized using a quantization table, and thus, quantized DCT coefficients are obtained. In a Huffman table selection unit, a Huffman table is generated in accordance with a Huffman code length table, which is determined in accordance with the minimum value of the quantization coefficients forming the quantization table. In a Huffman encoding process circuit, the quantized DCT coefficients are Huffman-encoded. The maximum value of the table number of the Huffman code length table is small, as the minimum value of the quantization coefficient is large.

REFERENCES:
patent: 5086488 (1992-02-01), Kato et al.
patent: 5196946 (1993-03-01), Balkanski et al.
"Digital Compression and Coding of Continuous-tone Still Images, Part 1: Requirements and Guidelines" By ISO/IEC, Ch-I-K, (1991-Mar.-15), (France, Afnor).

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