Browse Prior Art Database

Color Image Digitization

IP.com Disclosure Number: IPCOM000036970D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Gagne, D: AUTHOR

Abstract

This disclosure provides a circuit for digitizing a color image into binary information and employs a black and white memory without compromising analog-to-digital conversion speed or memory size.

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Color Image Digitization

This disclosure provides a circuit for digitizing a color image into binary information and employs a black and white memory without compromising analog-to-digital conversion speed or memory size.

Color information of an image is initially created from output guns of a color camera. Each gun output is equivalent to the output of a black and white camera, and thus the digitized output of each color will result in a visible image. A set of comparators and AND gates associated with a particular color isolates color levels ranging from light to dark for each output of that particular color gun. Color signals isolated from each of the three sets of comparators are combined such that only a specific color range in the spectrum is digitized in a black and white buffer.

The figure illustrates a digitizer circuit used in conjunction with a conventional black and white binary frame grabber memory. Color information of an image is created from the outputs of the guns R, B and G of a color camera. Two voltage comparators are used for each color, and the camera output for that color is provided to both comparators. The other input to each of the comparators is from a software adjustable analog-to-digital converter. For each analog color signal, one of the comparators defines an upper amplitude limit and the other comparator defines a lower amplitude limit, thereby establishing a window in which each color signal will exist and represented by outputs o...