Image analysis – Image compression or coding – Parallel coding architecture
Patent
1995-06-06
1996-06-04
Couso, Jose L.
Image analysis
Image compression or coding
Parallel coding architecture
382238, 382239, 382304, 348397, 358430, 358467, G06K 936, G06K 946, H04N 712, H04N 1417
Patent
active
055240674
ABSTRACT:
An image processing device including a blocking section for dividing an input image into a plurality of blocks each consisting of N1.times.N2 (N1, N2: positive integers) picture elements; a block attribute determining section for determining an attribute of each block, the attribute being defined as one of a flat portion having substantially no density variation in each block, a semi-flat portion having a binary density distribution in each block, and an edge portion having a steep density variation in each block; a first coding section for coding each block of the flat portion; a second coding section for coding each block of the semi-flat portion; a third coding section for predictively coding the picture elements in each block of the edge portion; a fourth coding section for coding the attribute determined by the block attribute determining section; and a code assembling section for assembling codes obtained by the first to fourth coding sections. Accordingly, an image quality, compression rate, processing time, etc. can be further improved.
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patent: 4922349 (1990-05-01), Abe et al.
patent: 5157743 (1992-10-01), Maeda et al.
"Low bit rate coding of high definition images for the digital copying machine", Iizuka et al., Proc. of PCSJ90, pp. 113-116, Oct. 1990.
"A Study of High Definition Image Coding Scheme Based on Arithmetic Approximation", Iizuka et al., Proc. of PCSJ91, pp. 183-186, Oct. 1991.
Minami Toshi
Miyake Hidetaka
Nakamura Osamu
Bella Matthew C.
Couso Jose L.
Fuji 'Xerox Co., Ltd.
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