Image processing apparatus

Details Image processing apparatus Image processing apparatus

1997-06-26

1999-07-20

Lee, Thomas D.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358433, H04N 140

Patent

active

059262923

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:
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patent: 4349835 (1982-09-01), Horiguchi et al.
patent: 4578704 (1986-03-01), Gharavi
patent: 4723298 (1988-02-01), Schiller
patent: 4884130 (1989-11-01), Huntsman
patent: 4918541 (1990-04-01), Ishida et al.
patent: 4949188 (1990-08-01), Sato
patent: 5003474 (1991-03-01), Ng
patent: 5070413 (1991-12-01), Sullivan et al.

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