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Automatic Image Brightness Scaling

IP.com Disclosure Number: IPCOM000064682D
Original Publication Date: 1985-Aug-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Jackson, PH [+details]

Abstract

Automatic image brightness scaling for display or printing re-maps percentile brightness points. For each image to be displayed or printed, two percentile brightness points are used to divide counted pixel brightness values into three portions - lower, middle and upper. The brightness range of the display or printer is also divided into three parts by an algorithm, and the image brightness is linearly mapped over these three parts. This has the effect of expanding or compressing the brightness ranges displayed or printed as compared to the brightness ranges of the image. An image, obtained from an input device, or from an image- generating program, will have an arbitrary range of brightness values.