Adaptive joint source-channel coding for JPEG2000 image transmission over unknown channels
Long Liu · Journal of Circuits and Systems · 2005
In the light of effective and reliable transmission of JPEG2000 images through unknown channels, an adaptive joint source-channel coding scheme based on feedback is put forward in this paper. SNR of a channel is estimated in real time by using subspace-based estimation method, and the error bit rate is obtained accordingly. Then by fully using the different characteristics of the JPEG2000 bit stream packets, a target function is constructed, by which different protections are carried out for different packets according to their impacts on the quality of the reconstructed image. Thus an adaptive rate-allocation is realized in a lower complexity. Experiments results show that the present algorithm improves on the existing ones.