Proceedings Article | 18 January 2004
KEYWORDS: Image compression, Cameras, Data compression, Computer programming, Image quality, Telecommunications, Imaging systems, Image processing, Algorithm development, Raster graphics
Considering nodes energy and channel bandwidth limitations in a multiview images network, avoiding inter-node communication in the coding scheme is necessary and makes the communication efficient, in comparison with conventional coding methods with internode communication. In our system, we consider a multiview images network as an array of nodes on a line with the same distance to each other. Each node in this system includes a camera to capture with a limited processing and communication abilities. We propose a multiview images coding without requiring inter-node communication, to gain the advantage of correlation at decoder side for two network configurations, but the main concept of the proposed coding for both network configurations is the same. The two network configurations are distinguished based on presence of parent node in each cluster, which sends full information to central node (i.e. joint decoder). The other nodes called children nodes and send their partial information to central node. In this paper, a coding scheme is proposed for multiview images network with parent node based on the number of parent nodes (i.e. “one parent node cluster” and “two parent node cluster”) in each cluster. Not that, because we are involved with multiview images, the decoding procedure is searching for correspondence between partially sent multiview images data. In coding scheme with parent node, if each parent node fails the decoding task of children nodes will be failed or the error caused by corresponding search during the decoding of children nodes is increased if network uses other parent nodes to decode the cluster without parent node. To make the network robust in case of node failure, we avoid parent nodes, and developed a network configuration where all nodes are children nodes (i.e. "without parent node cluster"). For such a network, we also propose a coding algorithm for multiview images that the joint decoder at central node is able to decode the partial information of each children node with side information of other children node. So, in case of losing any viewpoint, joint decoder is still able to decode other received partial information of children nodes. Finally, we have compared coding scheme of network with and without inter-node communication for different cluster configuration mentioned herein, and “all parent node cluster” configuration, considering communication rate in the network, symmetry in communication and decoding quality of children node, and their robustness in case of nodes failure.
