Image analysis – Image compression or coding – Lossless compression
Patent
1997-03-18
1999-05-04
Couso, Jose L.
Image analysis
Image compression or coding
Lossless compression
382232, G06K 936
Patent
active
059012510
ABSTRACT:
The present invention provides a method for compressing image data. The method first detects a pattern in a first subset of the image data, where the second subset being collocated to a second subset. If no pattern is detected, then a text mode context model is selected. If a pattern is detected, then the period of the pattern is detected and a pattern mode context model is selected. The pattern mode context model has a width directly related to the period of the pattern detected. An arithmetic compressor compresses the second subset using the selected context model.
REFERENCES:
patent: 5131049 (1992-07-01), Bloomberg et al.
patent: 5297220 (1994-03-01), Nomizu
Baca Anthony J
Couso Jose L.
Hewlett--Packard Company
Novik Dmitry
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