Real-time foveation techniques for H.263 video encoding in software

Authors:
H. R. Sheikh;Shizhong Liu;B. L. Evans;A. C. Bovik
Affiliations:
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA;-;-;-
Venue:
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 03
Year:
2001

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Abstract

Video coding techniques employ characteristics of the human visual system (HVS) to achieve high coding efficiency. Lee (2000) and Bovik have exploited foveation, which is a non-uniform resolution representation of an image reflecting the sampling in the retina, for low bit-rate video coding. We develop a fast approximation of the foveation model and demonstrate real-time foveation techniques in the spatial domain and discrete cosine transform (DCT) domain. We incorporate fast DCT domain foveation into the baseline H.263 video encoding standard. We show that DCT-domain foveation requires much lower computational overhead but generates higher bit rates than spatial domain foveation. Our techniques do not require any modifications of the decoder.