Compression of image data with retaining cost data for each comp

Details Compression of image data with retaining cost data for each comp Compression of image data with retaining cost data for each comp

1996-09-26

1998-11-17

Boudreau, Leo H.

Image analysis

Image compression or coding

Transform coding

382232, 382235, 382250, G06K 936, G06K 946

Patent

active

058388311

ABSTRACT:
An enhancement to the standard JPEG image data compression technique includes a step of recording the length of each string of bits corresponding to each block of pixels in the original image at the time of compression. The list of lengths of each string of bits in the compressed image data is retained as an "encoding cost map" or ECM. The ECM, which is considerably smaller than the compressed image data, can be transmitted or retained in memory separate from the compressed image data along with some other accompanying information and is used as a "key" for editing or segmentation of the compressed image data.

REFERENCES:
patent: 5229864 (1993-07-01), Moronaga et al.
patent: 5257113 (1993-10-01), Chen et al.
patent: 5327248 (1994-07-01), Miller et al.
patent: 5379122 (1995-01-01), Eschbach
patent: 5408328 (1995-04-01), Boliek et al.
patent: 5521718 (1996-05-01), Eschbach
W. B. Pennebaker and J.L. Mitchell, JPEG: Still Image Compression Standard, New York, NY: Van Nostrand Reinhold, 1993.

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