Image Communications Based on Adaptive Segmentation and WIPC-LDPC over Wireless Channels

In order to improve error resilient ability and transmission efficiency for image transmission over wireless channels, a joint source channel coding (JSCC) scheme was proposed in this paper, in which adaptive image segmentation and irregular low-density parity check (LDPC) was fitted together. At first, an adaptive image segmentation method according to the pixel intensity was designed to segment an image into different region of interest (ROI) with different level of significance. Then, a novel irregular LDPC with weight-increasing parity-check (WIPC) matrix (WIPC-LDPC) was put forward, which can easily realize unequal error protection (UEP) scheme. At last, the adaptive segmentation and WIPC-LDPC coding were combined together to achieve JSCC: the different significance level ROI from the adaptive segmentation were coded by WIPC-LDPC with dissimilar degree bit nodes to achieve different level of protection. Simulation results show that the proposed scheme can support robust image transmission with not only high objective PSNR but also excellent subjective visual quality