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Enhancement of Image Display Resolution Through Higher-Precision Pel Placement

IP.com Disclosure Number: IPCOM000043246D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Fisher, RC: AUTHOR

Abstract

Conventional methods of increasing the resolution of video (CRT) displayed images have required higher speed circuitry and the provision of additional memory to store additional picture-element (pel) data. This article describes a technique which yields double-precision pel placement for display character generation without additional pel data requirements. This technique represents an application of the concept of achieving pseudo double-precision resolution for the display of image data generated at 192 pels per inch on a standard display with a bandwidth capable of only 96 pels-per-inch resolution. The net effect is to simulate the operation of two memories in parallel, with resultant simulation of doubling of storage capacity and bandwidth.

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Enhancement of Image Display Resolution Through Higher-Precision Pel Placement

Conventional methods of increasing the resolution of video (CRT) displayed images have required higher speed circuitry and the provision of additional memory to store additional picture-element (pel) data. This article describes a technique which yields double-precision pel placement for display character generation without additional pel data requirements. This technique represents an application of the concept of achieving pseudo double-precision resolution for the display of image data generated at 192 pels per inch on a standard display with a bandwidth capable of only 96 pels-per-inch resolution. The net effect is to simulate the operation of two memories in parallel, with resultant simulation of doubling of storage capacity and bandwidth. The concept can also be applied to the character data contained in a ROS (read-only storage) character generator to effect greater precision in pel placement for character enhancement without, however, requiring higher-precision pel data from the ROS. The implementation of the concept is illustrated in Figs. 1 and 2. Fig. 1A shows a typical capital X from the ROS character generator of a word-processing system, such as the Displaywriter, for example. However, by rearranging the placement of the data in the ROS in terms of the configuration shown in Fig. 1B, and by utilizing a largely unused bit position (8) (shown here to specify which rows of d...