人脸识别中人脸检测部分的C代码，检测率可达95 。-Face human face detection part of the C code, the detection rate of 95 .

利用opencv进行人脸检测，解决原始代码不兼容部分USB摄像头的问题(face detection using opencv, fix some minnor problems in the opencv demo that may cause video capture failure.)