2001 IEEE Int.
Conf. on Acoustics, Speech, and Signal Processing,
May 7-11, 2001, vol. 3, pp. 1781-1784, Salt Lake City, UT.
Real-Time Foveation Techniques for H.263 Video Encoding in Software
Hamid R. Sheikh,
Brian L. Evans, and
Alan C. Bovik
Department of Electrical and Computer Engineering,
Engineering Science Building,
The University of Texas at Austin,
Austin, TX 78712-1084 USA
Video coding techniques employ characteristics of the Human Visual System
(HVS) to achieve high coding efficiency. S. Lee has exploited foveation,
which is a non-uniform resolution representation of an image reflecting
the sampling in the retina, for low bit-rate video coding. In this paper,
we develop a fast approximation of the foveation model and demonstrate
real-time foveation techniques in the spatial domain and the Discrete
Cosine Transform (DCT) domain. We demonstrate that fast DCT domain
foveation can be incorporated into the baseline H.263 video encoding
standard with very low computational overhead. We also present a
comparison of the two techniques in terms of their computational
complexity as well as resulting bit rates. Our techniques do not require
any modifications of the decoder.
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