Image analysis – Histogram processing – For setting a threshold
Patent
1992-05-12
1995-01-24
Couso, Yon J.
Image analysis
Histogram processing
For setting a threshold
382 17, 382 41, 348420, G06K 936
Patent
active
053848683
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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Pratt, "Spatial Transform Coding of Color Images", IEEE Tran. on Comm., vol. COM-19, No. 6, Dec. 1971 p. 980.
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Omachi et al "DCT-VQ Coding Scheme with Adaptive Bond Partition", Inst. Elec. Infor. & Comm. Engl., National Convention Record 1987, p. 1131.
Maeda Mitsuru
Yoshida Tadashi
Canon Kabushiki Kaisha
Couso Yon J.
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