Picture compression apparatus, picture reproducing apparatus and

Details Picture compression apparatus, picture reproducing apparatus and Picture compression apparatus, picture reproducing apparatus and

1996-05-03

1997-10-07

Couso, Yon J.

Image analysis

Image compression or coding

382251, 382233, G06K 936

Patent

active

056756674

ABSTRACT:
Digital image data are compressed in a first iteration of orthogonally transforming a predetermined amount of the original image data, such as index data for a splite pattern, and quantizing the transform coefficients. Then the quantized data are locally decoded, and the decoded data are compared with the original image data. If there are no errors, that is, the decoded data matches the original image data, the quantized data are variable length encoded to form compressed data for output, such as recording on a CD-ROM recording medium. If there are errors, then a next iteration is performed, in which the original image data are bit shifted and then orthogonally transformed, the transform coefficients are quantized, and the quantized data are locally decoded. As before, the decoded data are compared with the original image data. If there are no errors, the quantized data are variable length encoded to form compressed data for output. If there are errors, then the original image data are further bit shifted in a next iteration, and the above described processing is repeated until there are no errors. The recorded compressed data are reproduced, variable length decoded, dequantized, inverse orthogonally transformed, inverse bit shifted, and used as picture data for display on a television.

REFERENCES:
patent: 4624006 (1986-11-01), Rempfer et al.
patent: 5216516 (1993-06-01), Tanaka et al.
patent: 5237431 (1993-08-01), Imoto
patent: 5357584 (1994-10-01), Yamaoka
Patent Abstracts of Japan, vol. 14, No. 24B (E-933), 28 May 1990 & JP-A-02 070126 (Toshiba) 9 Mar. 1990, Abstract.
ICC '93, vol. 1, 23 May 1993 Geneva, pp. 537-541, a.c. Hadenfeldt et al., "Compression of Colour-Mapped Images", Abstract, paragraph 3-4.

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