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In Zhonghua wei zhong bing ji jiu yi xue

OBJECTIVE : To explore the application of human behavior recognition based on convolutional neural network (CNN) in the new generation of pre-hospital first aid.

METHODS : Sixty videos were obtained from the Montreal Falling Video Data base, and divided into model training data and evaluation test data at a ratio of 5:1. (1) Data model training: singular value decomposition was used to clarify the picture, the target boundary of the human body in the picture was identified through target detection and Fourier transform, then the human body curve was described; OpenCv computer vision and machine learning software library to estimate the body pose were used to mark the important parts of the human body (such as hips, knees), the angle between the line of important parts and the horizontal direction and the length and width ratio of the detection frame were calculated, and whether the human body had abnormal behavior was identified. (2) Evaluation test: 6 videos were randomly extracted from the model training data set, 10 frame were extracted from each video, each frame was treated as one picture, CNN behavior recognition was used on each frame, and calculated the recognition rate between normal behavior and abnormal behavior.

RESULTS : In the process of data model training, each frame was artificially labeled to train the CNN human behavior recognition model. The evaluation results showed that the recognition rate of normal behavior was (90.33±3.03)%, and the recognition rate of abnormal behavior was (87.74±2.88)%.

CONCLUSIONS : When passers-by have dangerous behaviors, the identification of human behaviors through CNN can determine whether they are in a critical state, and issue early warning in time, which plays a vital role in pre-hospital first aid.

Yu Qing, Jiang Peijing, Wang Yaoguo, Wang Zhiyue

2020-Nov