Hybrid DCT/quadtree motion-compensated coding of video sequences

Sam J. Liu; Feng-Ming Wang

doi:10.1117/12.174975

2 May 1994 Hybrid DCT/quadtree motion-compensated coding of video sequences

Sam J. Liu, Feng-Ming Wang

Proceedings Volume 2187, Digital Video Compression on Personal Computers: Algorithms and Technologies; (1994) https://doi.org/10.1117/12.174975
Event: IS&T/SPIE 1994 International Symposium on Electronic Imaging: Science and Technology, 1994, San Jose, CA, United States

Abstract

This paper proposes a hybrid DCT/Quadtree coding technique to compress motion compensated difference images for video conferencing applications. The hybrid scheme is developed primarily to eliminate the visually annoying `corona' effect caused by the traditional DCT coding of subimage blocks containing edge components. In this coding framework, the quadtree segmentation scheme is selected to compress edge blocks because of its ability to describe geometrical structures accurately. For quadtree coded blocks, each segmented subregion is represented by its associated sample mean, which is quantized and transmitted along with the segmentation pattern information to the receiver for reconstruction. The remaining subimage blocks are coded using the DCT. Simulation results demonstrate that this hybrid coding system provides a subjectively superior video quality than traditional DCT coding systems: the corona effect is virtually eliminated and the visible difference is most noticeable at low bit rates.

Citation Download Citation

Sam J. Liu and Feng-Ming Wang "Hybrid DCT/quadtree motion-compensated coding of video sequences", Proc. SPIE 2187, Digital Video Compression on Personal Computers: Algorithms and Technologies, (2 May 1994); https://doi.org/10.1117/12.174975

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