Image analysis – Image compression or coding
Patent
1992-11-25
1996-04-09
Couso, Jose L.
Image analysis
Image compression or coding
G06K 936
Patent
active
055069169
ABSTRACT:
An image compression apparatus has a separation section for performing processing for dividing image data into a plurality of data blocks, an orthogonal transformer for orthogonal-transforming each data block, a bit allocation table for storing data representing the number of bits allocated in accordance with the frequency component of the orthogonal-transformed data output from the orthogonal transformer, an arithmetic operation circuit for calculating an amplitude probability density function of an identical frequency component of the orthogonal-transformed image data for each pixel, and calculating a quantization limit band causing a mean square error to be minimized in acordance with the calculating amplitude probability density function and the bit-number data from the bit allocation table, and a band limit table for storing the quantization limit band data. A quantizing circuit quantizes the orthogonal-transformed block information from the orthogonal transformer in accordance with the data stored in the allocation table and the band limit table.
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Nishihara Eitaro
Ogawa Yoshihiko
Wu Zhixiong
Couso Jose L.
Kabushiki Kaisha Toshiba
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