Remnant detection method and device and medium

The invention relates to the technical field of image processing, in particular to a remnant detection method and device and a medium. The sensitivity of remnant detection to illumination can be reduced. The method comprises the following steps: acquiring a plurality of first binary image blocks included in a current frame image of a target area; for each first binarized image block, determining a second binarized image block matched with the first binarized image block from a plurality of second binarized image blocks included in the previous frame of image of the target area; for each first binarized image block, calculating the similarity between the first binarized image block and a second binarized image block matched with the first binarized image block to obtain the similarity of a plurality of binarized image blocks; and performing remnant detection processing according to the similarity of the plurality of binarized image blocks. When the method is used for detecting the remnants, the success rate of