NDLI: A novel low complexity Local Hybrid Pseudo-SSIM-SATD distortion metric towards perceptual rate control

Content Provider	IEEE Xplore Digital Library
Author	Joshi, Y.G. Loo, J. Shah, P. Rahman, S. Yoong Choon Chang
Copyright Year	2013
Description	Author affiliation: Fac. of Eng., Multimedia Univ., Cyberjaya, Malaysia (Yoong Choon Chang) \|\| Sch. of Sci. & Technol., Middlesex Univ., London, UK (Joshi, Y.G.; Loo, J.; Shah, P.; Rahman, S.)
Abstract	The front-end block-based video encoder applies an Image Quality Assessment (IQA) as part of the distortion metric. Typically, the distortion metric applies uniform weighting for the absolute differences within a Sub-Macroblock (Sub-MB) at any given time. As video is predominately designed for Humans, the distortion metric should reflect the Human Visual System (HVS). Thus, a perceptual distortion metric (PDM), will lower the convex hull of the Rate-Distortion (R-D) curve towards the origin, by removing perceptual redundancy and retaining perceptual clues. Structured Similarity (SSIM), a perceptual IQA, has been adapted via logarithmic functions to measure distortion, however, it is restricted to the Group of Picture level and hence unable to adapt to the local Sub-MB changes. This paper proposes a Local Hybrid Pseudo-SSIM-SATD (LHPSS) Distortion Metric, operating at the Sub-MB level and satisfying the Triangle Equality Rule (≤). A detailed discussion of LHPSS's Psuedo-SSIM model will illustrate how SSIM can be perceptually scaled within the distortion metric space of SATD using non-logarithmic functions. Results of HD video encoded across different QPs will be presented showing the competitive bit usage under IbBbBbBbP prediction structure for similar image quality. Finally, the mode decision choices superimposed on the Intra frame will illustrate that LHPSS lowers the R-D curve as homogeneous regions are represented with larger block size.
Starting Page	1
Ending Page	6
File Size	1248275
Page Count	6
File Format	PDF
ISBN	9781467360470
ISSN	21555044
DOI	10.1109/BMSB.2013.6621695
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-05
Publisher Place	UK
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heating
Content Type	Text
Resource Type	Article

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