Interactive Enhancement Of Tone Scale

Donald E. Troxel; William F. Schreiber; Nancy J. Burzinski; Mark D. Matson

doi:10.1117/12.932618

23 July 1982 Interactive Enhancement Of Tone Scale

Donald E. Troxel, William F. Schreiber, Nancy J. Burzinski, Mark D. Matson

Proceedings Volume 0301, Design of Digital Image Processing Systems; (1982) https://doi.org/10.1117/12.932618
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

Abstract

The tone scale or gradation of a continuous tone picture is the most important factor related to the quality of an image. We have developed special purpose analog and digital circuitry which enables the real-time (30 updates per second) computation of a tone scale transformation which is then applied to a digitized picture being displayed on a television monitor. In our system the tone scale transformations are controlled by knobs which are labelled in terms meaningful to photographic artisans, rather than requiring an operator to specify points on a transfer characteristic as is common with other systems. These knobs directly specify minimum and maximum densities, brightness, and shadow, highlight and overall contrast. These control parameters may be selectively enabled by the operator. After the appropriate aesthetic modifications have been achieved on the television display, the operator may initiate the transformation of the complete stored image prior to subsequent computer processing or hard copy output.

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Donald E. Troxel, William F. Schreiber, Nancy J. Burzinski, and Mark D. Matson "Interactive Enhancement Of Tone Scale", Proc. SPIE 0301, Design of Digital Image Processing Systems, (23 July 1982); https://doi.org/10.1117/12.932618

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KEYWORDS

Photography

Televisions

Image quality

Analog electronics

Digital electronics

Digital image processing

Printing

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