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Proceedings Paper

Software-only video decompression into arbitrary shapes
Author(s): Roger J.F. Wilson
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Paper Abstract

This paper describes how the painting of decompressed digital video data has been altered from the original highly efficient rectangle to a completely programmable shape: any pixel of the output shape can be painted with any pixel from the decompressed picture. In addition, because the system paints all pixels of the output shape each frame, the actual shape can be moved and changed while decompression proceeds. Shape files are precompiled into a run length format (described in the paper) and this format is manipulated into a screen pixel based data structure before the movie is played. There is no limit (apart from available processor power) on the complexity of the shape: it can be disconnected, concave etc. though it can only contain pixels from the current decompressed picture. Using a 25 MHz ARM3 (Acorn Archimedes) or ARM610 processor, the system is capable of decompressing a 25 frame per second file, painting it onto a 3D model of an acorn (two parabolic surfaces for `nut' and `cup', plus two cylinders for the `stalk') with the movie wrapped round each separate surface, the whole thing rotating as the movie is played.

Paper Details

Date Published: 1 April 1994
PDF: 8 pages
Proc. SPIE 2188, High-Speed Networking and Multimedia Computing, (1 April 1994); doi: 10.1117/12.171724
Show Author Affiliations
Roger J.F. Wilson, Acorn Computers Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 2188:
High-Speed Networking and Multimedia Computing
Arturo A. Rodriguez; Mon-Song Chen; Jacek Maitan, Editor(s)

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