基于人体骨骼关键点的吸烟行为检测算法

针对公共场所的监控视频中烟头目标较小并且吸烟产生的烟雾易发散，仅依靠目标检测算法检测烟头或者烟雾来判定吸烟行为存在较大难度的问题，考虑到利用骨骼关键点来进行姿态估计的算法越来越成熟，提出一种利用人体骨骼关键点和吸烟行为之间的关系来进行吸烟行为检测的算法。该算法首先利用AlphaPose和RetinaFace分别检测出人体骨骼关键点和脸部关键点信息，根据手腕到两嘴角中点和手腕到同侧眼睛的距离之比，提出一种计算人体的吸烟动作比例（SAR）是否属于吸烟动作黄金比例（GRSA）的方法以区分吸烟与非吸烟行为；再利用YOLOv4检测视频中是否存在烟头；最后结合GRSA判定和YOLOv4的结果来确定视频中存在吸烟行为的可能性高低，作出是否有吸烟行为的判定。经过笔者录制的数据集测试，结果表明所提算法可以准确检测到吸烟行为，准确率达到92%。

Smoking behavior detection algorithm based on human skeleton key points

In view of the small target of cigarette butts in surveillance videos of public places and the easy divergence of smoke generated by smoking， it is difficult to determine the smoking behavior only by target detection algorithm. Considering that the algorithm of posture estimation using skeleton key points is becoming more and more mature， a smoking behavior detection algorithm was proposed by using the relationship between human skeleton key points and smoking behavior. Firstly， AlphaPose and RetinaFace were used to detect the key points of human skeleton and face respectively. According to the ratio of distance between wrist and middle point of two corners of mouth and between wrist and the eye on the same side， a method for calculating whether the Smoking Action Ratio （SAR） in humans falls within the Golden Ratio of Smoking Actions （GRSA） to distinguish smoking from non-smoking behaviors was proposed. Then， YOLOv4 was used to detect whether cigarette butts existed in the video. The results of GRSA determination and YOLOv4 were combined to determine the possibility of smoking behavior in the video and make a determination of whether smoking behavior was present. The self-recorded dataset test shows that the proposed algorithm can accurately detect smoking behavior with the accuracy reached 92%.