opencv实现的摄像头采集视频，实时显示并检测到人脸，检测到人脸时提高分辨率，可保存视频并回放，-opencv realized camera capture video, real-time display and detects a human face, human face detection to improve the resolution, you can save video and playback,

配置好opencv库以后，对图片中某个区域提取出来单独进行处理，处理完毕后放回原图像。-After configuring the opencv library, an area on the image is processed separately extracted, processed back into the original image after.