Image encoding and decoding apparatus

Details Image encoding and decoding apparatus Image encoding and decoding apparatus

1996-09-05

1999-11-23

Coles, Edward L.

Image analysis

Image compression or coding

Lossless compression

382245, 382238, 382250, 382297, 3582611, 3582612, 3582613, 3582614, G06K 936, H04N 1419, H04N 1417, H04N 1415

Patent

active

059914505

ABSTRACT:
At the encoding side, a sum of code lengths of a block is calculated and stored in a memory for each of block lines (stripes); and at the decoding side, when decoding of one block is completed, a head address of a code in the next block is calculated utilizing a sum of an amount of codes utilized for the decoding operation and code lengths for each of the stripes. The rotation process of an image utilizing encoded data is performed in accordance with the head address. Further, at the encoding side, colors of pixels in a predetermined block is determined, and encoding operation is performed block by block for only those blocks including pixels of different colors. At the decoding side, an address of block data for sequentially constructing a rotated image is controlled to decode the pixels in the block, and finally the rotation process is performed on the pixels in the block in accordance with the color of the pixels.

REFERENCES:
patent: 4658430 (1987-04-01), Anderson et al.
patent: 5170264 (1992-12-01), Saito et al.
patent: 5710826 (1998-01-01), Osawa et al.

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