Secure image transmission method based on fountain code and self-adaptive resource distribution

The invention discloses a secure image transmission method based on a fountain code and self-adaptive resource distribution. The invention aims at specifically ensuring the security of a region-of-interest in a medical image under delay constraint. Firstly, the image is subjected to region segmentation to extract the region-of-interest (ROI) and a background region (BG), thus two kinds of original data packages ROI and BG are obtained. Secondly, the type of the data package to be transmitted is selected according to the channel quality of a legal link and the receiving state identifiers of the two kinds of data packages. Then the self-adaptive resource distribution is performed according to the channel quality of the legal link, thus a legal receiving end achieves higher data package correct receiving rate. At last, the RS fountain code is performed on the original data package to be transmitted. In order to compensate relatively high time delay due to the fact that the BG package is transmitted when the channel quality is poor, the two kinds of packages are simultaneously transmitted in a superimposed coding manner when the channel quality is especially good. By simulation verifying, the secure image transmission method can well achieve key protection on the ROI in the image.