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Real Time Aspect Ratio Correction for PC Graphics Emulation

IP.com Disclosure Number: IPCOM000058207D
Original Publication Date: 1988-Sep-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Blackard, JW Neal, KS [+details]

Abstract

A method is described to correct the aspect ratio when a PC graphics screen image is painted on a high resolution All-Points-Addressable (APA) display. Graphics images which are produced for a 640x200 pel resolution display with a pel aspect ratio of approximately 2.1 to 1 need to be modified so that they are suitable for a high resolution display with an aspect ratio of 1 to 1. The aspect ratio must be corrected so that geometric graphic objects (e.g., a circle) produced for the lower resolution display will maintain their proportionate shape when transferred to the higher resolution screen. To maintain the geometric shape of the transferred image onto the high resolution display, the pel ratio of the image needs to be corrected to a square 1 to 1 ratio. Since the image is produced for a display with a 2.