Study on image compression coding based on ESPIHT in the free space laser communication
Jingfeng Zang, Xuhua Zhai, Fu Sun, Yan Piao, Xiaoyuan Yan, FuChang Yin · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2007
Free-space laser communication is a research direction in wireless communication domain. The image transmission, compression coding and storage are ones of most important techniques in the free space laser communication. In order to improve error resilient capability and transmission efficiency for image transmission over noisy and varying channels in the free space laser communication (FLSC) , we contrive a joint source and channel coding (JSCC) scheme, in which extended set partitioning in hierarchical trees (ESPIHT) and rate compatible punctured convolutional code (RCPC) are used. Specifically, ESPIHT segments an image into different sizes of blocks whilst determining different levels of source significance; RCPC code is then used to provide unequal error protection for individual blocks. Various simulations show that this scheme can support robust and efficient image transmission in a very effective way. Experiments demonstrate that the proposed method can obviously improve the image quality compared to that of the classical approach of separate source and channel coding. The peak SNR for reconstruction image also has some improvement. It is an effective fast image compression method.