Abstract: Based on the wavelet transform of image，the conventional ROI progressive transmission algorithm is improved using visual masking effect.On the premise of the high quality of ROI image，the important coefficients for human vision will be transmitted firstly.And a flexible background image transmission mechanism is proposed.An expansion factor S is introduced in order to indicate the importance of BG image relative to ROI.Moreover，depending on different network bandwidth，the factor can be used to control the BG image transmission mode so as to assure that the whole image have good objective visual effect.In the simulation experiment，the objective and subjective comparative analysis between conventional algorithm and improved algorithm will be made.Eventually，the experimental results proved the validity of the proposed algorithm.

摘要： 利用人眼的视觉掩蔽效应，以图像小波变换为基础，改进了传统的感兴趣区渐进图像传输算法。在ROI图像质量得到保证的同时，优先传输视觉上重要的小波系数，并提出一种灵活的背景传输机制。此机制引入扩展因子的概念来说明背景图像相对于ROI的重要性，并且可以根据网络带宽利用扩展因子来调节背景图像的传输方式，以确保从整体上改善图像的主观视觉效果。仿真实验从主观和客观两个方面对改进算法和传统算法进行了对比分析，验证了该算法的有效性。