可以打开视频文件，对视频文件中的人头进行检测并统计数量。算法有HOG RCNN 及Aggrate Channel Features三种(You can open the video file, the head of the video file to detect and statistics. Algorithm HOG RCNN Aggrate Channel Features tionchannel three)

使用ACF聚合通道特征算法，实现人脸检测(Face detection using ACF aggregation channel feature algorithm)