High-definition video preprocessing method and system

The invention relates to the field of communication technology and specifically to a high-definition video preprocessing method and system. The high-definition video preprocessing method and system have beneficial effects of by training and updating a reference background image and performing similarity calculation between a current video frame image and the reference background image, detecting a background image, deleting redundant information with more similarities with the reference background image, and effectively saving high-definition video network transmission resources and background storage space in order to save cost.