Method and apparatus for compressing and decompressing images of

Details Method and apparatus for compressing and decompressing images of Method and apparatus for compressing and decompressing images of

1994-10-25

1996-07-23

Boudreau, Leo

Image analysis

Image compression or coding

382233, 382260, 348432, G06K 936, G06K 946

Patent

active

055398421

ABSTRACT:
A method and apparatus for compressing images having a binary extractor, a binary compressor and a JPEG compressor. The binary extractor produces a binary image representing an estimate of the binary information in the original image. The binary image is compressed by the binary compressor. The binary image is also subtracted from the original image to produce a difference image representing the continuous-tone information in the original image. The difference image is then compressed using the JPEG compressor. In this manner, the present invention compresses a document image without having to perform segmentation on the image.

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Kuwata, Naoki et al., "A New B-Level Quantizing Method For Document Images", IEEE Transactions on Comsumer Electronics, vol. 38, No. 3, Aug. 1992 pp. 718-724.
Rollins, Michael et al., "Possible Harmonic-Wavelet Hybrids In Image Compression", IEEE, 1992, pp. 191-198.
Lameillieure, J. et al., "Vector Quantization Based On Visual Masking Functions For The DPCM and HDPCM Coding Of Coloured Pictures", Belgium, pp. 548-552, (date unknown).
Japio--Patent Abstracts of Japan, Oct./1976-Oct. 1992.

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