Key frame extraction method and device, equipment and medium

The invention discloses a key frame extraction method and device, equipment and a medium. The key frame extraction method comprises the steps of obtaining a to-be-processed video frame sequence of a moving target, and performing motion feature and color feature extraction on the to-be-processed video frame sequence to obtain a multi-dimensional feature extraction result; determining an inter-frame difference index according to the multi-dimensional feature extraction result and the number of video shots matched with the to-be-processed video frame sequence; determining a key frame threshold according to the inter-frame difference index and the total frame number of the video frame sequence to be processed; and determining a target key video frame in the to-be-processed video frame sequence through the target detection model, the inter-frame difference index and the key frame threshold. According to the technical scheme provided by the embodiment of the invention, the key frame threshold can be adaptively set,