Compression for reduction of off-chip video bandwidth

Egbert G.T. Jaspers; Peter H. N. de With

doi:10.1117/12.451065

20 December 2001 Compression for reduction of off-chip video bandwidth

Egbert G.T. Jaspers, Peter H. N. de With

Proceedings Volume 4674, Media Processors 2002; (2001) https://doi.org/10.1117/12.451065
Event: Electronic Imaging, 2002, San Jose, California, United States

Abstract

The architecture for block-based video applications (e.g. MPEG/JPEG coding, graphics rendering) is usually based on a processor engine, connected to an external background SDRAM memory where reference images and data are stored. In this paper, we reduce the required memory bandwidth for MPEG coding up to 67% by identifying the optimal block configuration and applying embedded data compression up to a factor four. It is shown that independent compression of fixed-sized data blocks with a fixed compression ratio can decrease the memory bandwidth for a limited set of compression factors only. To achieve this result, we exploit the statistical properties of the burst-oriented data exchange to memory. It has been found that embedded compression is particularly attractive for bandwidth reduction when a compression ratio 2 or 4 is chosen. This moderate compression factor can be obtained with a low-cost compression scheme such as DPCM with a small acceptable loss of quality.

Citation Download Citation

Egbert G.T. Jaspers and Peter H. N. de With "Compression for reduction of off-chip video bandwidth", Proc. SPIE 4674, Media Processors 2002, (20 December 2001); https://doi.org/10.1117/12.451065

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