Wireless Multimedia Sensor Network with an Efficient Distributed Video Coding for Multimedia Broadcasting

摘要

Wireless Multimedia Sensor Network (WMSN) is a conceptual network composed of autonomous hardware for capturing and transmission of quality audio-visual content. Due to the energy constraint of the sensor nodes, the distributed video coding (DVC) with the advantage in low encoder complexity is employed to construct WMSN network. In this paper, a practical DVC scheme, pixel-domain Wyner-Ziv(PDWZ) video coding, with slice structure and adaptive rate selection is proposed to solve the problems when applying DVC into WMSN. By utilizing the slice structure, the proposed PDWZ is adaptable to any interleaver size used in Slepian-wolf turbo codec for heterogeneous applications. The slice structure also facilitates an optimal adaptive rate selection transmission as compared to the conventional PDWZ. The simulation results clearly showed the enhancement in R-D performance and perceptual quality. Furthermore, the proposed adaptive rate selection scheme is based on evaluation of side information in which the feedback process during decoding is optimized. It can be observed that system delay caused by frequent feedback is greatly reduced. This gives a promising support for WMSN with low latency and facilitates the QoS management.