Multiple-scale retinex with color restoration（ MSRCR） is a defogging algorithm which can solve problem of contrast decline of image and degradation of image feature caused by haze and fog

it can effectively improves visual effect of image

but cannot ensure real-time processing due to high complexity of algorithm. Optimization is carried out on MSRCR algorithm based on hardware characteristics of TM320DM642 and transformation of time domain to frequency domain

achieve real-time processing of video with size of 1024 × 1024 by simulation and obtain satisfied visual effect.