Visual Media Coding and Transmission

6.5 Low-delay Random View Access in Multi-view Coding Using a Bit Rate-adaptive Downsampling Approach

6.5.1 Problem Definition and Objectives

(Portions reprinted, with permission, from E. Ekmekcioglu, S.T. Worrall, A.M. Kondoz, “Low delay random view access in multi-view coding using a bit-rate adaptive downsampling approach”, IEEE International Conference on Multimedia & Expo (ICME), 23–26 June 2008, Hannover, Germany. ©2008 IEEE. E. Ekmekcioglu, S.T. Worrall, A.M. Kondoz, “Utilisation of downsampling for arbitrary views in mutli-view video coding”, IET Electronic Letters, 28 February 2008, Vol. 44, Issue 5, p. 339–340. (c)2008 IET.)

In this research, a new multi-view coding scheme is proposed and evaluated. The scheme offers improved low-delay view random access capability and, at the same time, comparable compression performance with respect to the reference multi-view coding scheme currently used. The proposed scheme uses the concept of multiple-resolution view coding, exploiting the tradeoff between quantization distortion and downsampling distortion at changing bit rates, which in turn provides improved coding efficiency. Bi-predictive (B) coded views, used in the conventional MVC method, are replaced with predictive-coded downscaled views, reducing the view dependency in a multi-view set and hence reducing the random view access delay, but preserving the compression performance at the same time. Results show that the proposed method reduces the view random access delay in ...