Blotch is one of the most common artifacts in archived film.This paper proposed an improved MRF-based blotch detection algorithm named MDV.The MDV algorithm has 3 steps.In the first step

SDIp and ROD algorithms are combined to increase the Recall rate in blotch detection.The definition of the second MRF-based step is restricted within the former result

which reduces the computational burden.The improved MRF-based algorithm then uses the combination of original frame and motion-compensated frame and the new denoising factor to reduce the false alarm rate.At the last step

spatio-temperal based matching algorithm is introduced for further refinement.The experimental results and comparative study with existing algorithms confirm that the proposed MRF method not only has higher recall rate and fewer false alarms

but also improves the computational speed significantly.