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Displaying of Frames by Image Data Inversion

IP.com Disclosure Number: IPCOM000042893D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Ohmori, K: AUTHOR

Abstract

This article describes a technique for displaying frames for image area area definition or indication on a display screen, in which the frames are generated by image data inversion in different line widths. Some displays use a frame to define or indicate a selected image area on the screen. In this technique, the frame is generated by inverting, as by exclusive-OR logic, data bits in a bit mapped image buffer memory at locations corresponding to the frame. This frame-generation method is advantageous in that erasure of the frame by re-inversion writing automatically restores the original image at the positions of the frame. There are instances where multiple frames are simultaneously displayed on the screen in an overlapped relationship.

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Displaying of Frames by Image Data Inversion

This article describes a technique for displaying frames for image area area definition or indication on a display screen, in which the frames are generated by image data inversion in different line widths. Some displays use a frame to define or indicate a selected image area on the screen. In this technique, the frame is generated by inverting, as by exclusive-OR logic, data bits in a bit mapped image buffer memory at locations corresponding to the frame. This frame-generation method is advantageous in that erasure of the frame by re-inversion writing automatically restores the original image at the positions of the frame. There are instances where multiple frames are simultaneously displayed on the screen in an overlapped relationship. When the frames have the same line width, the overlapped portions of the frames are erased due to re-inversion, as indicated by C in Fig. 1. To solve the problem, this technique uses different line widths for the respective frames. In this case, overlapping of the frames will result in a frame display as indicated by D in Fig. 2, for example, thereby maintaining the image area definition capability of the frames. The use of different frame line widths is also effective to identify image areas of different types, such as a source area A which contains an image to be subjected to processing, such as rotation, enlargement or reduction, and a destination area B to which the processed sourc...