Keyframe extracting method and system for monitoring system videos

Abstract

The invention provides a keyframe extracting method and system for monitoring system videos. The method comprises the following steps of (a) utilizing a background differencing method to extract keyframe sequences including movement objects in the videos; (b) calculating the similarity degree of every two adjacent frames in the keyframe sequences based on a joint histogram, extracting keyframes with the similarity degree smaller than a threshold value and adding the keyframes into a keyframe set; (c) judging whether mark numbers of every two adjacent keyframes in the keyframe set are smaller than a certain interval or not, deleting the keyframes with small information entropies and updating the keyframe set if the mark numbers are smaller than the certain interval. By utilizing the keyframe extracting method and system for monitoring the system videos, the keyframes including the movement objects can be extracted from a large amount of monitored videos by using a simple algorithm, redundant data in the keyframe sequences are remarkably decreased, and the storage amount of video data are remarkably decreased.

Description

technical field [0001] The invention relates to the field of intelligent video monitoring, in particular to a key frame extraction method and system for monitoring system video. Background technique [0002] With the development of digital video processing technology and the improvement of social security awareness, surveillance equipment is widely used in all walks of life, which generates a large amount of surveillance video data, making video storage, retrieval and browsing operations complicated and time-consuming . Therefore, how to quickly and efficiently store and browse useful information in massive surveillance video information is of great significance to today's surveillance video. In order to quickly browse and efficiently utilize these monitoring data, key frame extraction technology is particularly important. [0003] A key frame is a limited subset of video frames that can represent the main content of a video sequence. In recent years, for different applic...

AI Technical Summary

Problems solved by technology

However, the above key frame extraction methods have the problems of complex algorithms and large amount of calculation, and they all extract key frames by calculating all frame sequences in the video, but real surveillance videos may contain a large number of pure background frames , so that it is not possible to specifically extract video clips that only contain moving objects that people want to view, and it is difficult to extract key frames

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