Multiview video compression with 1-D transforms

Karasoy B., KAMIŞLI F.

SIGNAL PROCESSING-IMAGE COMMUNICATION, vol.33, pp.14-28, 2015 (SCI-Expanded) identifier identifier


Many alternative transforms have been developed recently for improved compression of images, intra prediction residuals or motion-compensated prediction residuals. In this paper, we propose alternative transforms for multiview video coding. We analyze the spatial characteristics of disparity-compensated prediction residuals, and the analysis results show that many regions have 1-D signal characteristics, similar to previous findings for motion-compensated prediction residuals. Signals with such characteristics can be transformed more efficiently with transforms adapted to these characteristics and we propose to use 1-D transforms in the compression of disparity-compensated prediction residuals in multiview video coding. To show the compression gains achievable from using these transforms, we modify the reference software (JMVC) of the multiview video coding amendment to H.264/AVC so that each residual block can be transformed either with a 1-D transform or with the conventional 2-D Discrete Cosine Transform. Experimental results show that coding gains ranging from about 1-15% of Bjontegaard-Delta bitrate savings can be achieved. (C) 2015 Elsevier B.V. All rights reserved.