Depthmap has sharp edges where depth changes. Precise edge information crucial in depth image based rendering (DIBR) system Figure: Multiview video puls depth (MVD) using depth image based rendering(DIBR) [1] Figure: Multiview video plus depth example [2] Error in edge information → geometry error in interpolated view → significant degradation of the quality [3] Traditional DCT (H.264/AVC) not efficient for arbitrary edges → requires edge-adaptive transform Related Work Graph-based transform

more »

... T) [3] Represent depth map as a graph Present edge-adaptive GBT construction Propose a greedy algorithm to find an optimal GBT CS-based depthmap compression [4, 5] Use fixed DCT as sparsifying basis Not adaptive to edges in blocks; inefficient for arbitrary edges GBT for Depthmap Compression GBT efficiently sparsify arbitrary edges in depthmap [6] Construction procedure For a given graph, G(V, E), construct adjacency matrix, A Compute Laplacian matrix, L: