max planck center for visual computing and communication
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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-ProcessingMotivationMC 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 100037.5
38
38.5
39
39.5
40
40.5
41
luminance bit-rate in kbps
lum
inan
ce P
SN
R in
dB
with updatewith ppno pp
750 800 850 900 950 100039.5
40
40.5
41
41.5
42
42.5
43
43.5
luminance bit-rate in kbps
lum
inan
ce P
SN
R in
dB
with updatewith ppno pp
City (CIF) video sequence
4 levels of 5/3 wavelet.
Foreman (CIF) video sequence
4 levels of 5/3 wavelet.