Accession Number : AD0647599

Title :   EVALUATION OF PSEUDO-RANDOM DOT-SCANNING TELEVISION SYSTEMS.

Descriptive Note : Final rept., 1 Oct 65-30 Nov 66,

Corporate Author : SPERRY RAND RESEARCH CENTER SUDBURY MASS

Personal Author(s) : Kaufman,L. ; Lincoln,A. J. ; Pitblado,C.

Report Date : JAN 1967

Pagination or Media Count : 64

Abstract : The broad objectives of this program were to obtain experimental data and theoretical analyses of the psychovisual factors relevant to the subjective and objective properties of display systems. Emphasis has been placed upon the contribution of scan format to the maintenance of useful pictorial information in narrow-bandwidth television displays. Consideration was also given to the use of stereoscopic vision as a potential avenue for enhancement of visual performance. Basic psychophysical techniques were employed to define the significant parameters which lead to optimum performance of visual tasks. Parameters varied were scan format, scan rate, display persistence, mode of presentation (i.e., stereoscopic, monocular, or dichoptic), target dimensions, target shape and complexity, and target contrast. Three broad classes of perceptual response may be identified: detection, recognition, and discrimination; tasks selected for the experimental constitute a sampling of all three of these basic categories. The following visual phenomena have appeared in these studies to bear upon performance of various visual tasks with narrow-bandwidth displays: (1) discriminability between brightness-modulated perturbations in the scan substructure and featureless, unilluminated space; (2) spontaneous closure and organizing phenomena, occurring in the scan substructure; (3) stereopsis and (4) visual brightness averaging over inhomogeneously illuminated space. (Author)

Descriptors :   (*TELEVISION DISPLAY SYSTEMS, SCANNING), DISPLAY SYSTEMS, STEREOSCOPIC DISPLAY SYSTEMS, OPTICAL IMAGES, VISUAL PERCEPTION, SENSES(PHYSIOLOGY)

Subject Categories : Anatomy and Physiology
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE