Low complexity sub-block perceptual distortion assessment for mode decision and rate-control

Joshi, Y.G., Loo, Jonathan, Shah, P., Rahman, Shahedur and Tasiran, A. (2015) Low complexity sub-block perceptual distortion assessment for mode decision and rate-control. In: 2015 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB), 17-19 June 2015, Ghent, Belgium.

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Abstract

Video is being used in a variety of portable and low powered devices, via online/on-demand services, for personal communications or over heterogeneous/wireless sensor networks. Likewise, perceptual evaluation is being sought, to ensure video sequences maintain perceptual integrity. This raises a challenge, to bring high complexity perceptual algorithms into a low complexity environment. Existing perceptual solutions minimise the overall complexity by making the Lagrange multiplier (λ), the quantisation stage perceptually aware. These solutions are restricted to the block level using the original pixels, a model or previous encoded block, thus avoiding assessing individual subblock candidates. Current perceptual algorithms like structured similarity (SSIM) uses statistical based calculations, and in order to be compatible with existing scores a further high complexity function is required for scaling. This paper presents a perceptual distortion and activity assessment that can operate at the subblock for each candidate during the later stages of encoding, in mode-decision and in rate-control, without the need for statistical calculations nor the high complexity associated with scaling a perceptual algorithm. The paper will show how several perceptual techniques of SSIM luma function, just noticeable detection (JND) and a new proposed edge detection can be used to form a low complexity solution. Consequently, the proposed low perceptual assessment has additional timing increase of <; +4 % for medium and low activity video sequences.

Item Type: Conference or Workshop Item (Paper)
ISSN: 2155-5044
ISBN: 9781479958658
Identifier: 10.1109/BMSB.2015.7177262
Additional Information: © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: Integrated circuits
Subjects: Computing
Depositing User: Jonathan Loo
Date Deposited: 21 Jun 2017 15:35
Last Modified: 13 Oct 2017 11:54
URI: http://repository.uwl.ac.uk/id/eprint/3477

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