Image Enhancement Through Film Recorder Response Contouring

John E. Boyd

doi:10.1117/12.931938

6 November 1981 Image Enhancement Through Film Recorder Response Contouring

John E. Boyd

Proceedings Volume 0278, Electro-Optical Instrumentation for Resources Evaluation; (1981) https://doi.org/10.1117/12.931938
Event: 1981 Technical Symposium East, 1981, Washington, D.C., United States

Abstract

In contrast to the traditional recording from high-altitude aircraft of Earth images directly onto film in their inherently continuous analog form, a Landsat Earth resources satellite samples the ground image brightness and records it on a digital, electronic medium. Although digitization incurs several extra steps in the reproduction of the imagery, it permits manipulation or enhancement of the data for special uses. For instance, image data enhancement techniques can be applied to partially restore contrast lost because of atmospheric luminance and scatter. More significantly, the digital-to-analog transfer function of the film recorder can be modified to simulate certain characteristics of other film types. Manipulation of a film's apparent gamma, relative speed, and linear-response region is easily accomplished by mapping the input data to a new distribution in real time using a hardware-implemented lookup table. To accomplish the desired photographic results, however, full cooperation and communication between photographic, electronic, and computer technologists is essential.

Citation Download Citation

John E. Boyd "Image Enhancement Through Film Recorder Response Contouring", Proc. SPIE 0278, Electro-Optical Instrumentation for Resources Evaluation, (6 November 1981); https://doi.org/10.1117/12.931938

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