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Browse Prior Art Database

Composition of Character and Graphic Images

IP.com Disclosure Number: IPCOM000043026D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Aoki, T: AUTHOR [+3]

Abstract

This article describes a technique for displaying the composite image of character and graphic patterns. Character video data from a character generator and graphic video data from a bit mapped image buffer memory are logically ORed for displaying their composite image and further fed back to the image buffer so that composite image data is obtained in the image buffer. Shift register control is used to assure synchronization in composing the character and graphic data of different data lengths. In the figure, character video data from the character generator and graphic video data from the bit mapped image buffer memory are respectively serialized by shift registers l and 2, then logically ORed, and then supplied to the CRT to display their composite image.

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Composition of Character and Graphic Images

This article describes a technique for displaying the composite image of character and graphic patterns. Character video data from a character generator and graphic video data from a bit mapped image buffer memory are logically ORed for displaying their composite image and further fed back to the image buffer so that composite image data is obtained in the image buffer. Shift register control is used to assure synchronization in composing the character and graphic data of different data lengths. In the figure, character video data from the character generator and graphic video data from the bit mapped image buffer memory are respectively serialized by shift registers l and 2, then logically ORed, and then supplied to the CRT to display their composite image. Concurrently, the ORed output is fed back to the image buffer through the register 2 and composite data register. Thus, the composite image data is available in the image buffer for utilization by an associated processor or other devices. The character generator and image buffer have different readout data lengths, 9 bits and 8 bits in the example, respectively. To synchronize the character and graphic data of different data lengths, the ORed output is applied to the shift register 2. When 7 bits of the ORed output are loaded into the register 2, the 7 bits are transferred in parallel to the composite data register, together with the 8th bit of the ORed output. Then...