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Post-Processing for Decoding without Update Step in Motion-Compensated Lifted Wavelet Video Coding Aditya Mavlankar, Markus Flierl and Bernd Girod {maditya,mflierl,bgirod}@stanford.edu MAX PLANCK CENTER FOR VISUAL COMPUTING AND COMMUNICATION Proposed Post-Processing Motivation MC lifted wavelets require update step at encoder. Skipping update step at decoder gives benefits like lower complexity and lower playout delay. But skipping this update step at decoder leads to significant quality degradation at high bit-rates. Analysis Synthesis with Update Step Synthesis without Update Step reconstruction shows spurious artifact proportional to original highband. Maintains low complexity and low playout delay. Extends to 5/3 wavelet. [Mavlankar et al. VCIP 2007] Mitigates half of the quality degradation. Experimental Results 700 750 800 850 900 950 1000 37.5 38 38.5 39 39.5 40 40.5 41 luminance bit-rate in kbps luminance PSNR in dB with update with pp no pp 750 800 850 900 950 1000 39.5 40 40.5 41 41.5 42 42.5 43 43.5 luminance bit-rate in kbps luminance PSNR in dB with update with pp no pp City (CIF) video sequence 4 levels of 5/3 wavelet. Foreman (CIF) video sequence 4 levels of 5/3 wavelet.
