Spatial Domain Image Packet Prioritization for Energy-Constrained Wireless Communications
Vaishnavi Yekklur Balaji, Wei Wang · 2016
We propose a lightweight, direct, and spatial domain packet prioritization framework for joint image compression and wireless transmission, which provides high Quality of Experience (QoE) for energy-constrained wireless multimedia communications. In the proposed framework, both the spatial domain image compression and the wireless communication bit packing strategies are co-designed in a scalable manner, adaptive to the tradeoff of energy constraints and QoE distortion requirements. Specifically, the highly correlated neighboring pixels are represented with fewer bits using a lightweight spatial domain quad tree decomposition technique. The compressed bits are then prioritized according to bit rate and the distortion importance for wireless communications. Simulation and experimental results show that the proposed scheme can effectively prioritize packets in spatial domain directly, and achieve high QoE even when some lower priority bits are discarded to meet the communication energy constraints.