Image output apparatus for gradation image data

Details Image output apparatus for gradation image data Image output apparatus for gradation image data

1993-05-20

1996-09-03

Powell, Mark R.

395109, G06F 1500

Patent

active

055532047

ABSTRACT:
A gradation image output apparatus in which processing speed does not decrease when binary image data is output and having a reduced memory capacity of the multi-bit bit-map planes. The image output apparatus includes both multi-bit gradation image storage and 1-bit gradation image storage. The multi-bit gradation image storage stores an image, each pixel of which has multi-bit data representing gradation level of the pixel. The 1-bit gradation image storage stores image data, each pixel of which is in one of two different gradation levels in which a gradation level of an area composed of a plurality of the pixels is represented by a ratio of pixels of one state to the other. The image output apparatus expands image data and synthesizes the expanded image data in both the multi-bit gradation image storage and the 1-bit gradation image storage.

REFERENCES:
patent: 4742400 (1988-05-01), Tsuji
patent: 5142301 (1992-08-01), Matsumoto
patent: 5195175 (1993-03-01), Kanno et al.
patent: 5231482 (1993-07-01), Murakami et al.
patent: 5305122 (1994-04-01), Hayashi et al.

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