Image information coding apparatus

Details Image information coding apparatus Image information coding apparatus

1992-03-12

1992-10-20

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 41, 358 12, G06K 938

Patent

active

051577437

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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patent: 4908862 (1990-03-01), Kaneko et al.
patent: 4918541 (1990-04-01), Ishida et al.
Pratt, "Spatial Transform Coding of Color Images", IEEE Trans. on Comm., vol. COM-19, No. 6, Dec. 1971, p. 980.
Pratt, "Slant Transform Image Coding", IEEE Trans. on Comm., vol. COM-22, No. 8, Aug. 1974, p. 1075.
Omachi et al., "DCT-VQ Coding Scheme with Adaptive Bond Partition", Inst. Elec., Info. and Comm. Eng., National Convention Record 1987, p. 1131 (in Japanese with English translation).

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