Image processing device

Details Image processing device Image processing device

1996-06-18

1998-09-08

Vu, Kim Yen

Facsimile and static presentation processing

Facsimile

Auxiliary signal

3582611, 3582612, 382245, H04N 1419, H04N 1417, H04N 1415

Patent

active

058053034

ABSTRACT:
A method of image processing includes the steps of allocating image data of a document into a plurality of blocks of a predetermined pixel matrix; determining a gradient range exponent and a mean value information for each of the blocks based on the image data contained in each of the blocks; encoding the image data of each pixel of each of the blocks into code data based on the mean value information and gradient range exponent for the respective block so that the code data defines each pixel with fewer gradation levels than the image data; determining whether or not a mutually adjoining block is related to a solid image of a same density relative to a block subject to the encoding process; and executing a run length encoding process for a batch of mean value information, gradient range exponent, and code data based on a run length of adjoining blocks discriminated as related to a solid image of the same density.

REFERENCES:
patent: 4979031 (1990-12-01), Tsuboi et al.
patent: 5119182 (1992-06-01), Tsuboi et al.
patent: 5361147 (1994-11-01), Katayama et al.
patent: 5576845 (1996-11-01), Komatsu

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