Accession Number : AD0662257

Title :   A PRELIMINARY EVALUATION OF THE ELASTIC SURFACE TRANSFORMATION FOR PROCESSING AND DISPLAYING PASSIVE SONAR AND PHOTOGRAPHIC INFORMATION.

Descriptive Note : Technical rept.,

Corporate Author : HUMAN FACTORS RESEARCH INC GOLETA CALIF

Personal Author(s) : Hall,Robert J. ; Dossett,William F. ; Kelley,Gene R.

Report Date : 16 NOV 1967

Pagination or Media Count : 33

Abstract : The goal of the research was to enhance images (signals) of low contrast and resolution by means of the elastic surface transformation (EST). The EST is a new display processing technique that permits the observer to manipulate and enhance marginal signals. The EST process consists of photographically transferring information from some sensor to a uniformly prestretched surface. The surface is then relaxed in a continuous fashion, producing a uniform spatial compression. During compression the element size remains constant. The shrinking changes the spatial dispersion, which increases the density of the elements per unit area. This increases the image contrast and enhances the dim edges and gradients. Optical magnification maintains the enhanced image at its original size. The major achievements of the present research were: (1) the development of a technique for implementing the EST, and (2) demonstrating enhanced marginal photographic images. These results show that it is possible to enhance images that could not be seen prior to the transformation. (Author)

Descriptors :   (*DISPLAY SYSTEMS, IMAGES), (*PHOTOGRAPHIC IMAGES, PROCESSING), MAN MACHINE SYSTEMS, PHOTOINTERPRETABILITY, SURFACES, ELASTIC PROPERTIES, TRANSFORMATIONS, SONAR SIGNALS

Subject Categories : Printing and Graphic Arts
      Acoustics
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE