这三篇文章是基于机器学习的人数统计的算法研究的，适合参考阅读。-These three articles are based on the number of statistical machine learning algorithms, and for reference reading.

采用51单片机和光电传感器对教室人数进出进行监控，可以区分出人数是进还是出。已经实物验证-With 51 single-chip and optical sensors to monitor the classroom and out of the number, can be distinguished into or out of the number is. Physical verification has been

基于视频的人数统计，对avi视频帧进行灰度处理，用三帧差法提取运动目标，-Avi video fr a mes on gray processed to extract moving target with three fr a me difference,

关于人流量统计的opencv代码，可以自动计算出摄像头左右两边的人数。-Traffic statistics about people opencv code, you can automatically calculate the number of people on both sides of the camera.