基于分布式信源编码的果园视频压缩方法研究  

Video Compression of Orchard Based on Distributed Source Coding

作　　者：代媛[1] 何东健[2] 张建锋[1] 方勇[1] 

机构地区：[1]西北农林科技大学信息工程学院,陕西杨凌712100 [2]西北农林科技大学机械与电子工程学院,陕西杨凌712100

出　　处：《农业机械学报》2016年第3期298-304,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家高技术研究发展计划(863计划)项目(2013AA102304);国家自然科学基金项目(61271280);中央高校基本科研业务费专项资金项目(2452015059)

摘　　要：分布式信源编码将编码端的复杂度转移至解码端,可有效解决果园无线视频传感器网络采集节点能量和计算能力受限的问题,但其实际性能还不够理想。为了进一步提高编码的率失真性能,针对果园视频时空相关性强的特点,提出一种基于块自适应的分布式视频编码架构,该架构根据视频内容的相关性选择编码方式,对于WZ帧块采用LDPC编码的方式并利用联合比特平面LDPC算法进行译码。以苹果和葡萄果园视频样本进行测试,结果表明,基于块自适应的分布式视频编码架构能充分利用视频的时空相关性,在相同的量化前提下,相比传统架构苹果和葡萄果园视频样本分别节约了6%~10%及9%~13%的码率。Due to the limitation of the nodes energy and computation ability in wireless visual sensor network（ WVSN）,the high complexity of traditional video coding in encoder is difficult to meet the requirement of practical application. Distributed source coding（ DSC） can fully exploit the source statistics at the decoder to reduce the computational burden at the encoder. DSC provides a new way for video compression of orchard because it can effectively solve the problem of limited resources of sensor node in WVSN. Distributed video coding（ DVC） is based on DSC,but it is a lossy compression coding technique. It suggests that under ideal conditions,the same rate distortion performance can be achieved as traditional video codecs. In practice however,there is still a significant performance gap between the two coding architectures. In order to improve the performance of DVC,a block adaptive DVC architecture was proposed according to the strong spatial and temporal correlation of the orchard video. It selected the coding pattern in accordance with the correlation of video content. WZ blocks were encoded with low density parity check（ LDPC） code. For practical consideration of computational complexity and errorcorrection performance of the decoder,the joint-bitplane LDPC decoding algorithm was used. Apple and grape orchard videos were tested and the experimental results show that the block adaptive DVC architecture can make the best use of the spatial and temporal correlation for compression coding.Compared with the traditional DVC,at the same quality of coding,it can save around 6% ~ 10% and9% ~ 13% of the bit rate for apple video and grape video,respectively.

关 键 词：果园 无线视觉传感器网络 视频编码 分布式信源编码 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]