摘要
对无线视频传感器节点的图像通信活动进行研究,分析了其在资源受限的无线多媒体传感器网络中进行图像编码和传输的性能。对基于DCT和DWT的图像编码与传输的能量消耗和率失真进行建模分析。根据所建立的能量消耗与率失真模型,对有限的能量和传输带宽进行优化分配。根据监测场景的统计信息,调整编码中所使用的参数,以使得能量消耗最小化。仿真实验结果表明,所提出的方法在保证应用所需图像质量的情况,有效地降低了无线传感器节点的数据通信量和计算过程的能耗。
The objective of this paper is to study the image communication behavior of a wireless video sensor,and analyze its performance under resource constrained wireless multimedia sensor networks.Energy consumption and rate distortion model of DCT and DWT based image compression and transmission is developed.Based on energy consumption and rate distortion model proposed,resource allocation is optimized with limited energy and bandwidth.Encoding coefficients are adapted according to the activity of monitoring scene,and then the energy consumption is minimized.Simulation results are conducted to show the performance of the work.The proposed scheme dramatically reduces image compression and transmission energy consumption under expected image distortion and transmission rate.
出处
《计算机工程与应用》
CSCD
2012年第14期27-32,共6页
Computer Engineering and Applications
基金
国家自然科学基金(No.60870010
No.60776834
No.60904049)
