Image analysis – Histogram processing – For setting a threshold
Patent
1993-01-11
1994-08-23
Mancuso, Joseph
Image analysis
Histogram processing
For setting a threshold
358539, G06K 936
Patent
active
053414411
ABSTRACT:
A coding apparatus divides digital image information into pixel blocks each having a size of m.times.n pixels, and subjects the image information to vector quantization in block units. The pixel blocks are orthogonally transformed and the characteristics and sequency components of the pixel blocks are detected. Each pixel block is divided into a plurality of sub-blocks in conformity with the detected sequency components. Respective ones of the plurality of divided and outputted sub-blocks are scalar-quantized into sub-vectors of a predetermined number of bits in conformity with the characteristics of the pixel blocks. Respective ones of the scalar-quantized values of the quantized sub-blocks are vector-quantized in conformity with the characteristics of the pixel blocks, these vector-quantized reproduction vector codes are combined and the result is subjected to further vector quantization.
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Maeda Mitsuru
Yoshida Tadashi
Canon Kabushiki Kaisha
Klocinski Steven P.
Mancuso Joseph
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