Video dirty-spot detection method and device, and electronic device

A method for detecting a dirty spot in a video, comprising:

• obtaining a reference frame corresponding to a current image frame in the video, wherein the reference frame comprises a front reference frame and a back reference frame, the front reference frame is an image frame before the current image frame in the video, and the back reference frame is an image frame after the current image frame in the video;
• filtering the current image frame, the front reference frame corresponding to the current image frame and the back reference frame corresponding to the current image frame to obtain filtered image frames;
• and
• determining whether there is the dirty spot in the current image frame according to a similarity of a corresponding one of the filtered image frames to the current image frame, a similarity of a corresponding one of the filtered image frames to the front reference frame corresponding to the current image frame and a similarity of a corresponding one of the filtered image frames to the back reference frame corresponding to the current image frame.