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Transform domain distributed video coding using larger transform blocks

Mahmood, Asif; Dooley, Laurence and Wong, Patrick (2017). Transform domain distributed video coding using larger transform blocks. In: 5th IEEE Global Conference on Signal and Information Processing, 14-16 Nov 2017, Montreal, Canada.

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Abstract

Distributed Video Coding (DVC) displays promising performance at low spatial resolutions but begins to struggle as the resolution increases. One of the limiting aspects is its 4x4 block size of Discrete Cosine Transform (DCT) which is often impractical at higher resolutions. This paper investigates the impact of exploiting larger DCT block sizes on the performance of transform domain DVC at higher spatial resolutions. In order to utilize a larger block size in DVC, appropriate quantisers have to be selected and this has been solved by means of incorporating a content-aware quantisation mechanism to generate image specific quantisation matrix for any DCT block size. Experimental results confirm that the larger 8x8 block size consistently exhibit superior RD performance for CIF resolution sequences compared to the smaller 4x4 block sizes. Significant PSNR improvement has been observed for 16x16 block size at 4CIF resolution with up to 1.78dB average PSNR gain compared to its smaller block alternatives.

Item Type: Conference or Workshop Item
Keywords: distributed video coding, wyner-ziv video coding, discrete cosine transform, transform block size, high resolution
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Computing and Communications
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Interdisciplinary Research Centre: Centre for Research in Computing (CRC)
Item ID: 50316
Depositing User: Asif Mahmood
Date Deposited: 03 Aug 2017 09:43
Last Modified: 03 Aug 2017 09:43
URI: http://oro.open.ac.uk/id/eprint/50316
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