Accession Number : AD0686482

Title :   TOWARD FORMULATION OF CRITERIA FOR IMAGE ENHANCEMENT.

Descriptive Note : Annual rept. Mar 68-Feb 69,

Corporate Author : CITY COLL NEW YORK DEPT OF PHYSICS

Personal Author(s) : Levi,Leo

Report Date : MAR 1969

Pagination or Media Count : 101

Abstract : The degree of enhancement is to be valuated in terms of the amount of information (in the colloquial sense) transferred to the final detector. Special attention is given to those systems in which the human visual system is the final detector. An extensive literature survey of proposed image quality criteria was made. These were evaluated and their areas of applicability determined. Under the restriction of linearity, optimization, too, was formulated for the relevant criterion. A survey of enhancement techniques was made and literature analyzing their performance was collected. A basic theory of a visual response was developed in which the various noise-sources play an integral part. This approach was carefully compared with experimental data concerning threshold contrast and accounted for these in detail. Since optical systems usually work in polychromatic light and available lens and detector performance data for such light are extremely limited, such data were computed for the 72 combinations of six of the most common light sources and twelve of the most common detectors, including photopic and scotopic vision. (Author)

Descriptors :   (*OPTICAL IMAGES, STANDARDS), (*VISUAL PERCEPTION, PERFORMANCE(HUMAN)), OPTIMIZATION, DETECTORS, BRIGHTNESS, NOISE, VISION, DISPLAY SYSTEMS, PSYCHOPHYSIOLOGY, RESPONSE, LIGHT, LENSES

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE