在研究图像退化原因的基础上，以退化图像

为依据，运用某些先验知识，建立系统退化

的数学模型，沿逆过程以最大的保真度恢复

图像，类似于图像增强，但更加客观。-Cause of image degradation in the study, based on the degradation of the image based on the use of some a priori knowledge to build a mathematical model of system degradation, along the reverse process with the greatest fidelity to restore the image, like image enhancement, but more objective.