Image analysis – Image compression or coding – Adaptive coding
Patent
1996-07-03
1998-11-03
Boudreau, Leo H.
Image analysis
Image compression or coding
Adaptive coding
382176, G06K 900
Patent
active
058321268
ABSTRACT:
To convert a mixture of text data and dot-mapped image data to compressed dot-mapped data not exceeding a given size, the text data are converted to dot-mapped data, then losslessly compressed, after which the dot-mapped image data are down-sampled as necessary. To compress dot-mapped data to within a given size, lossless compression, lossy compression, and down-sampling followed by compression are attempted until the necessary size reduction is achieved. To convert a page of object data to compressed dot-mapped data, the objects are classified and prioritized, then rasterized and compressed by different methods according to their priorities. The compression ratios are predicted and monitored, and the compression parameters are modified according to the prediction error.
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Boudreau Leo H.
Oki Data Corporation
Tadayon Bijan
LandOfFree
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