基于多节点协作的WMSNs图像压缩算法

针对无线多媒体传感器网络能量和计算能力有限，在图像压缩过程中需兼顾压缩能耗和图像质量之间的关系等问题，结合JPEG-XR压缩流程和网络的结构特点，提出一种基于多节点协作的图像压缩方法.构建相机节点到普通邻居节点，再到簇头的网络结构，将图像压缩传输等过程分布于协作簇中；通过协作方法完成压缩流程的多节点协同执行.仿真结果表明，在低码率条件下与JPEG方法相比，该方法的峰值信噪比提高约3 dB；而网络寿命方面，更好地平衡了网络负载，大大延长了网络寿命. 

A Image Compression Algorithm Based on Multi-Node Cooperation in Wireless Multimedia Sensor Networks

To solve the problem of limited energy and computing ability in wireless multimedia sensor networks and to eliminate the computation for the relationship between compression energy consumption and image quality in the process of image compression, combining the compression process of JPEG-XR and the structural characteristics of network,a method of image compression was proposed based on multi-node cooperation.Firstly,the camera nodes were connected to ordinary neighbor nodes and then to cluster-heads to construct a network structure, making the process of image compression and transmission distributed in cooperative clusters. Then a cooperative method was used to implement the multi-node cooperation in compression process.The simulation results show that,in low bit rate condition,the PSNR of this method can increase about 3dB compared with JPEG method.And in terms of network life,the network load can be balanced better and the network lifetime can be extended greatly with the new method.