Key Technology Research On Video Observing And Recording System Of Student Classroom Behavior

The video observing and recording system of student classroom behavior is based on video data.The student classroom behavior is analyzed by using computer vision technology and pattern recognition.The result of analysis is recorded as the reference for the evaluation of students' class performance.The video observing and recording system is a new method for data obtain.Compare with traditional data obtain methods,the data recorded is more objective,and the data redundancy is greatly reduced.It has wide application prospect.In this paper,the video observing and recording system of student classroom behavior is analyzed in detail.We mainly studied the video data acquisition,video data processing and data storage technology.The main work and innovations in this paper are as follows.(1)Video data contains a large amount of redundant information and the removal of redundant information is the key to improve the speed of video data processing.Based on the analysis of the video observation and record system of student classroom behavior,the method of observing target activity region segmentation based on human face detection is designed.And a new AdaBoost face detection algorithm based on skin color information is proposed,which improves the detection accuracy.(2)The importance of object extraction in video is introduced,and the characteristics of classroom behaviors are analyzed.The method of face recognition is used as the basis of target classification,and we proposed the method of observation target extraction based on face recognition.(3)Several major behaviors of students in class are studied.In this paper,the algorithm of behavior detection and recognition is based on the 7Hu moments of the motion history image and the motion energy image.The classification criterion is based on the Mahalanobis distance.The detection speed is fast.It is suitable for real-time behavior observation.Then we design the data record program for student classroom behavior based on the behavior detection.(4)After studying the key technology of video observation and record,we implement the basic function of the system based on the platform of VS2010 and OpenCV2.4.9.The functions include the statistics and record of the classroom information.