Motz, Bénédicte
Cheung, Gene
Frossard, Pascal
Graph-Based Representation and Coding of Multiview Images
Proceedings of IEEE ICASSP
Proceedings of IEEE ICASSP
Proceedings of IEEE ICASSP
Proceedings of IEEE ICASSP
5
3D imaging
graphical representation
graph Fourier transform
2016
2016
Instead of lossily coding depth images resulting in undesirable geometric distortion, graph-based representation (GBR) describes disparity information as a graph with a controllable accuracy. In this paper, we propose a more compact graphical representation called GBR-plus to code both disparity and color information of a target view given a reference view. Specifically, first we differentiate between disocclusion holes (occluded spatial regions in the reference view) and rounding holes (insufficiently sampled regions in the reference view) in the synthesized target view, so that the decoder can optionally complete rounding holes via signal interpolation without coding overhead. Second, we use a compact graphical representation to delimit disparity-shifted boundaries of objects in the target view, which is coded losslessly. Finally, color pixels in disocclusion holes are predicted using adjacent background pixels as predictors, and prediction residuals in a local neighborhood are coded using Graph Fourier Transform (GFT). Experimental results show that GBR-plus outperforms previous GBR, and has comparable performance as HEVC at mid to high bitrates with lower encoder complexity.
Ieee
978-1-4799-9988-0
Proceedings of IEEE ICASSP
Conference Papers
000388373401059