Sand and dust degraded image enhancement method and device based on distance weighted color cast estimation

The invention relates to the technical field of image processing, provides a sand and dust degraded image enhancement method and device based on distance weighted color cast estimation, and aims to solve the problem that a conventional image enhancement algorithm cannot effectively perform color cast recovery and visibility enhancement on degraded images with atmosphere color cast in severe weather, such as sand and dust images, and further distortion may be caused. According to the main scheme, the method comprises the steps of reading in an image I to be processed, and converting the image into an RGB space; obtaining an image camera-scenery distance precise estimation matrix D according to the input image I; solving an image distance weighted color cast matrix X.D according to the matrix D; according to the matrix D and the matrix X.D, solving the image degradation equation to obtain an intermediate result image Im with corrected color cast and improved visibility; and according to the matrix D and the int