Image analysis – Image compression or coding
Patent
1997-04-03
1999-11-16
Couso, Jose L.
Image analysis
Image compression or coding
G06K 934
Patent
active
059871776
ABSTRACT:
Image compression and expansion with a high compression ratio includes encoding one block of data of an image, when data within the block are all equal, with a single representative value as gradation information and bit map data as resolution information representing that all the data within the block are equal. When there are variations in the data of the block and differences between the representative values in one block and those in an adjacent block are small, the difference values and flag bits, indicating that the gradation information represents the difference values, are used as the gradation information. When there are variations in the data of the block and differences between the representative values in the block and those in the adjacent block are large, absolute values of the representative values expressed in terms of bits smaller in number than the number of bits of the representative values and flag bits, indicating that the gradation information represents the absolute values, are used as the gradation information. Thus, coding compression of the image information is carried out with bit map data indicative of distribution of pixels of each group.
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Couso Jose L.
Matsushita Electric - Industrial Co., Ltd.
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