Accession Number : AD0698756

Title :   AN ANALYSIS OF COMPUTER GRAPHICS IN A RASTER FORMAT DISPLAY.

Descriptive Note : Final technical rept.,

Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y

Personal Author(s) : Metzger,Richard A.

Report Date : NOV 1969

Pagination or Media Count : 84

Abstract : An attempt was made to analyze the problems associated with the presentation of computer generated graphic data in a raster scan (or television) type of display. This type of display has been used extensively with Digital-to-Video (D/V) Converters for the presentation of alphanumerics and symbology, with the D/V Converter performing the transformation from the digital data of the computer to the video signal compatible with the raster scan display. However, the problem of graphics generation within such a system has only recently been addressed. The primary constraint of the system, with respect to graphics generation, is the restrictive Cartesian grid that is imposed by the raster scan format. After a brief examination of the techniques of D/V Conversion, the paper considers the peculiar problems associated with graphics generation. Algorithms are derived to allow the generation of straight lines, circles, parabolas and arcs within the raster format. These algorithms are independent of raster line standard and are amenable to most computer programming languages. All algorithms are verified utilizing a general purpose computer and D/V Converter, and are then analyzed with respect to display presentation in terms of end point accuracy, uniformity and appearance. (Author)

Descriptors :   (*INPUT OUTPUT DEVICES, *TELEVISION DISPLAY SYSTEMS), CATHODE RAY TUBES, ALGORITHMS, FEASIBILITY STUDIES

Subject Categories : Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE