Defocused image quality assessment based on gradient and HVS
基于梯度及HVS特性的离焦模糊图像质量评价*

Based on the latest study on human visual system(HVS) characteristics,this paper proposed the assessment model of the defocused image quality based on the gradient and HVS characteristics (GVSSIM). This model took use of the Sobel edge gradient operator to extract the gradient information of the image, and weighed the formula in accordance with the characteristics of HVS to get the similarit assessment indicators of the new structure, and accessed to the image quality assessment indicators. This method is characteristics of simple computation and the assessment result of the defocused image better reflect the human subjective feeling compared with the SSIM evaluation model.