利用android手机摄像头拍照，并用haar特征法对拍摄的照片进行人脸检测-Use android phone camera to take pictures and characteristic method using haar photographs for face detection

通过指尖按住摄像头，图像变化获取帧数据来检测心跳-Fingertip holding down the camera, the image acquisition frame data to detect changes in heartbeat