Multiple value image input device with chromatic gradation corre

Details Multiple value image input device with chromatic gradation corre Multiple value image input device with chromatic gradation corre

1990-10-12

1993-04-13

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358406, H04N 140

Patent

active

052027732

ABSTRACT:
A multiple value image input device receives image data expressed in pixels with each pixel expressed in one density gradation level or shading. A method and device for correcting image data read by an image scanner has a density reference plate with a number indicating segments with known density gradation levels. The image scanner reads the density indicating segments and compares the actually read density gradation level with the known density gradation level. One or more density indicating segments is selected to be scanned. The selection may be based upon the image data to be read.

REFERENCES:
patent: 3489849 (1970-01-01), Hedger
patent: 4427998 (1984-01-01), Huntoon
patent: 4903144 (1990-02-01), Stefanik et al.
patent: 4974098 (1990-11-01), Miyakawa et al.
patent: 5048106 (1991-09-01), Nakajima et al.
McConnell, Kenneth R. et al. "Fax: Digital Facsimile Technology & Applications", Artech House, Inc. 1989 pp. 164-169.

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