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This study examines the quality implications of skipping the update step during the decoding process in motion-compensated lifted wavelet video coding. While omitting the update step reduces complexity and playout delay, it leads to significant quality degradation at high bit rates. Experimental results using CIF video sequences illustrate the relationship between bit rate and luminance PSNR, revealing how this strategy can mitigate half of the quality loss associated with high-frequency artifacts. We propose effective post-processing methods to enhance video quality post-decoding.
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But skipping this update step at decoder leads to significant quality degradation at high bit-rates. Synthesis with Update Step Synthesis without Update Step 41 with update with pp 40.5 no pp 40 39.5 luminance PSNR in dB 39 38.5 38 37.5 700 750 800 850 900 950 1000 luminance bit-rate in kbps 43.5 with update with pp 43 no pp 42.5 42 luminance PSNR in dB 41.5 41 40.5 40 39.5 750 800 850 900 950 1000 luminance bit-rate in kbps Proposed Post-Processing Motivation Post-Processing for Decoding without Update Step in Motion-Compensated Lifted Wavelet Video CodingAditya Mavlankar, Markus Flierl and Bernd Girod{maditya,mflierl,bgirod}@stanford.edu • MC lifted wavelets require update step at encoder. • Skipping update step at decoder gives benefits like lower complexity and lower playout delay. Analysis • 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 City (CIF) video sequence 4 levels of 5/3 wavelet. Foreman (CIF) video sequence 4 levels of 5/3 wavelet. reconstruction shows spurious artifact proportional to original highband. MAX PLANCK CENTER FOR VISUAL COMPUTING AND COMMUNICATION
