Image forming apparatus and method based on reduction images and

Details Image forming apparatus and method based on reduction images and Image forming apparatus and method based on reduction images and

1996-05-16

1999-11-16

Lee, Thomas D.

Image analysis

Image compression or coding

382298, 358451, 395102, G06K 936, G06K 932, H04N 1393, G06F 1500

Patent

active

059871750

ABSTRACT:
An image forming apparatus includes an encode process unit for: (a) allocating image data of an original document into blocks containing a predetermined pixel matrix, and (b) determining from the image data in each block a mean value information and a gradient range exponent for each block; a series copy data generating unit for generating reduction image data for a plurality of reduction images by using the mean value information for each of the blocks as image data for the reduction images so that each pixel of the reduction images corresponds to a respective one of the plurality of blocks of the original document image data; and an image forming unit for forming images based on the reduction image data generated by the series copy data generating unit.

REFERENCES:
patent: 4979031 (1990-12-01), Tsuboi et al.
patent: 5097518 (1992-03-01), Scott et al.
patent: 5119182 (1992-06-01), Tsuboi et al.
patent: 5361147 (1994-11-01), Katayama et al.
patent: 5495539 (1996-02-01), Sieverding
patent: 5576845 (1996-11-01), Komatsu

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