Image analysis – Image compression or coding – Including details of decompression
Patent
1997-05-09
1999-07-13
Couso, Jose L.
Image analysis
Image compression or coding
Including details of decompression
382232, 382244, 382245, 382246, G06K 936
Patent
active
059237830
ABSTRACT:
The present invention aims to execute effective compression even in the case where inputted image information has the bit number smaller than that of a pixel value, such as a tag, and besides in the case where the entropy increases if a prediction error obtained by subtraction of a value of a neighboring pixel from that of an object pixel is used for calculation of the entropy.
According to the present invention, in an image encoding apparatus, the inputted image information is made to be packed image data of a fixed length and provided to a couple of predicting elements and a couple of prediction error calculating elements. The packed image data and prediction errors outputted from the couple of prediction error calculating elements are provided to a prediction error selecting element and one of the data and prediction errors having a smallest entropy is selected. A selecting element outputs an identification number of one of the predicting elements which succeeds in prediction, and if the predicting elements fail in prediction, the selecting element outputs the data or prediction error selected by the prediction error selecting element. The output from the selecting element is encoded by an encoding element to Huffman code, for example
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"A Guide for Document Data Compressing Algorthm", Uematsu, T., CQ Publishing Co., pp. 32-33, 1994.
Kawauchi Kenichi
Kimura Shun-ichi
Yokose Taro
Couso Jose L.
Dang Duy M.
Fuji 'Xerox Co., Ltd.
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