Image processing apparatus

Details Image processing apparatus Image processing apparatus

1994-04-12

1995-11-07

Brinich, Stephen

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358536, H04N 141

Patent

active

054651735

ABSTRACT:
An image processing apparatus has a memory device for storing pixel image data including both halftone image data such as data of image of a photograph having a gradation and line image data such as data of text containing characters. The storage is conducted on the basis of blocks each having a predetermined number of pixels. The mean information quantity of the halftone image data per pixel stored in the memory means is not greater than the information quantity of the line image data per pixel stored in the memory means. The halftone image data being compressed on the basis of the block. Therefore, both the halftone image data and line image data can be stored in a small memory by using common addresses, without causing any degradation of the image quality.

REFERENCES:
patent: 3555262 (1971-01-01), Shimada
patent: 4114547 (1979-03-01), Stoffel
patent: 4349835 (1982-09-01), Horiguchi et al.
patent: 4884130 (1989-11-01), Huntsman
patent: 4965677 (1990-10-01), Pennebaker et al.
patent: 5070413 (1991-12-01), Sullivan et al.
patent: 5157743 (1992-10-01), Maeda et al.
"Printer Character Generator With Image Feature" IBM Technical Disclosure Bulletin V. 13 No. 9 (Feb. 1989).

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