AN ANALYSIS OF COMPUTER GRAPHICS IN A RASTER FORMAT DISPLAY.
Final technical rept.,
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y
Pagination or Media Count:
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 DV Converters for the presentation of alphanumerics and symbology, with the DV 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 DV 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 DV Converter, and are then analyzed with respect to display presentation in terms of end point accuracy, uniformity and appearance. Author
- Computer Hardware