ROI progressive image transmission algorithm based on human visual specialties
一种基于人眼视觉特性的ROI渐进图像传输算法

In conventional region of interest(ROI) progressive image transmission algorithms,human visual specialties are not taken into account.An improved algorithm based on the properties of wavelet transform and human visual specialties was proposed.Firstly,an image with low resolution was transmitted so that user could decide if the image was needed.On the condition that there is no impact on the subjective quality of ROI,the transmission of ROI coefficients which are not important for visual quality could be delayed.And the bandwidth could be utilized to transmit the important back ground(BG) coefficients.Furthermore,depending on the bit rates,an expansion factor was evaluated.To guarantee the image with better visual effects,the transmission of BG image was controlled by the expansion factor.The experimental results show that the improved algorithm is effective and the expansion factor can accommodate image transmission.