Image analysis – Image compression or coding – Quantization
Patent
1994-09-23
1998-02-24
Couso, Yon J.
Image analysis
Image compression or coding
Quantization
348405, G06K 936
Patent
active
057217912
ABSTRACT:
An image information coding apparatus includes a cut-out or extracting unit for cutting out image information into blocks each having a predetermined size, e.g., 4.times.4 pixels, a preprocessing unit such as an orthogonal transformation unit (e.g., a Hadamard transformation unit) and a scalar quantization unit for performing predetermined preprocessing of the block as a matrix, a separator for separating a plurality of components (e.g., phase information, amplitude information, and zero information) from each element of the preprocessed matrix, information quantizers for coding individual pieces of information constituted by each component, and a synthesizer for synthesizing coding results.
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Maeda Mitsuru
Yoshida Tadashi
Canon Kabushiki Kaisha
Couso Yon J.
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