Study On The Compression Of Image In Wireless Optical Communication

In this papar, we present a JSCC scheme to transmit compressed wireless fading channels, which is based on unequal error protection (UEP) and adaptive rate allocation. And the main contents of this thesis are as follows.This thesis improves the SPIHT algorithm by encoding low-frequency coefficients of a decomposed image with DPCM method and encoding subtree data using virtual-zerotree structure. Experimental results show the I-SPIHT algorithm can achieve more excellent performance.In this thesis, a general and effective JSCC scheme is proposed, which provides a 3-grade UEP strategy for I-SPIHT bit streams of different importance and adjusts the rates adaptively between the source and the channel encoder according to the characteristic of time-varying wireless channels, thus yields good performance and high reliability without adding extra bandwidth. Experimental results of different systems show that the proposed scheme can obviously improve the image quality after transmitting even if the channels are in the bad condition.