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High Resolution Display And Printing Technique

IP.com Disclosure Number: IPCOM000052099D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Yao, YL: AUTHOR

Abstract

The resolution or image quality of a display or printer may be effectively increased without increasing the number of pels (picture elements, or dots by perturbing the positions of pels or dots so as to achieve smoother line edges. The total number of dots or pels in a field is not changed, but each dot or pel may be positioned at several (say, four) different (and generally overlapping) positions.

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High Resolution Display And Printing Technique

The resolution or image quality of a display or printer may be effectively increased without increasing the number of pels (picture elements, or dots by perturbing the positions of pels or dots so as to achieve smoother line edges. The total number of dots or pels in a field is not changed, but each dot or pel may be positioned at several (say, four) different (and generally overlapping) positions.

This technique will be described in connection with a simple raster scan CRT system. It will be obvious that the same technique can be used with other technologies, such as a printer using the dot matrix principle.

In the figure, each dot has one normal position (solid line circle) as well as three possible perturbed positions. The three perturbed positions for dot 10 are shown as dotted circles 10a, 10b and 10c. Each of the other dots may be similarly perturbed.

In addition to the normal X and Y raster scan deflection system for the CRT, there might be two small additional deflection coils for perturbing the beam to one of the perturbed positions. It is possible, alternatively, to combine raster scan signals and perturbation signals into a single deflection signal without any modification of the CRT tube.

The total number of pels on the screen is not changed, but the number of addressable points for each pel has been increased from one to four. The memory required to control each pel is thus three bits (without data compr...