Memory bandwidth efficient two-layer reduced-resolution decoding of high-definition video

Mary L. Comer

doi:10.1117/12.411807

29 December 2000 Memory bandwidth efficient two-layer reduced-resolution decoding of high-definition video

Mary L. Comer

Proceedings Volume 4310, Visual Communications and Image Processing 2001; (2000) https://doi.org/10.1117/12.411807
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

This paper addresses the problem of efficiently decoding high- definition (HD) video for display at a reduced resolution. The decoder presented in this paper is intended for applications that are constrained not only in memory size, but also in peak memory bandwidth. This is the case, for example, during decoding of a high-definition television (HDTV) channel for picture-in-picture (PIP) display, if the reduced resolution PIP-channel decoder is sharing memory with the full-resolution main-channel decoder. The most significant source of video quality degradation in a reduced-resolution decoder is prediction drift, which is caused by the mismatch between the full-resolution reference frames used by the encoder and the subsampled reference frames used by the decoder. to mitigate the visually annoying effects of prediction drift, the decoder described in this paper operates at two different resolutions -- a lower resolution for B pictures, which do not contribute to prediction drift and a higher resolution for I and P pictures. This means that the motion-compensation unit (MCU) essentially operates at the higher resolution, but the peak memory bandwidth is the same as that required to decode at the lower resolution. Storage of additional data, representing the higher resolution for I and P pictures, requires a relatively small amount of additional memory as compared to decoding at the lower resolution. Experimental results will demonstrate the improvement in video quality achieved by the addition of the higher-resolution data in forming predictions for P pictures.

Citation Download Citation

Mary L. Comer "Memory bandwidth efficient two-layer reduced-resolution decoding of high-definition video", Proc. SPIE 4310, Visual Communications and Image Processing 2001, (29 December 2000); https://doi.org/10.1117/12.411807

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KEYWORDS

Video

Image resolution

Computer programming

Optimal filtering

Data storage

Resolution enhancement technologies

Image processing

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