Browse Prior Art Database

SINGLE PASS COLOR RASTER INPUT SCANNER USING SINGLE PHOTOSENSOR ARRAY

IP.com Disclosure Number: IPCOM000025378D
Original Publication Date: 1985-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 80K

Publishing Venue

Xerox Disclosure Journal

Abstract

An intermediate electronic image of a document is made by scanning the document line-by-line (raster scanning). A color image can be made in several ways; typically by using a single linear photosensor array and by sequentially scanning the document with red, green and blue filters. After all these separtion scans are made and stored, a color processing maximizes the color copy quality. This technique utilizes large and costly memory storage.

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XEROX DISCLOSURE JOURNAL

SINGLE PASS COLOR RASTER INPUT SCANNER USING SINGLE PHOTOSENSOR ARRAY

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Proposed Classification US. C1. 250/216
Int. CI. HOlj 3/14

- - . . . .

Thomas J. Hammond John A. Durbin

William L. Lama

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34

11 Volume 10 Number 1 January/February 1985

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SINGLE PASS COLOR RASTER INPUT SCANNER USING SINGLE PHOTOSENSOR ARRAY (Cont'd)

An intermediate electronic image of a document is made by scanning the document line-by-line (raster scanning). A color image can be made in several ways; typically by using a single linear photosensor array and by sequentially scanning the document with red, green and blue filters. After all these separtion scans are made and stored, a color processing maximizes the color copy quality. This technique utilizes large and costly memory storage.

To decrease the large memory requirement, the following systems are proposed. Figure 1 shows a side view of a color RIS system 10 which produces a near- simultaneous color-separated image using a single photosensor array I2 and three pulsed lamps 14, 16, 18 that are spectrally limited. The flash rate of the lamps is synchronized to the scan rate of the document 20 placed on a transparent platen 22 so that the document is exposed at a desired rate; e.g. 300 lines/inch and projected through a linear gradient index lens array 24. The read rate of the array 12 is also synchronized to the flash side...