Real-time foveation techniques for H.263 video encoding in software
Hamid R. Sheikh, Shizhong Liu, Brian L. Evans, Alan Conrad Bovik · 2002
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.