2018-04-11 OpenCV

video format

CV_CAP_PROP_POS_MSEC 视频当前点的毫秒值或视频捕捉的时间戳
CV_CAP_PROP_POS_FRAMES 下次将被捕获的0基索引的帧
CV_CAP_PROP_POS_AVI_RATIO 视频文件的相关位置: 0 - start of the film, 1 - end of the film.
CV_CAP_PROP_FRAME_WIDTH 视频流帧的宽度
CV_CAP_PROP_FRAME_HEIGHT 视频流帧的高.
CV_CAP_PROP_FPS 帧率.
CV_CAP_PROP_FOURCC 4字符编码的编码器.
CV_CAP_PROP_FRAME_COUNT 视频文件的帧数.
CV_CAP_PROP_FORMAT 由retrieve()返回矩阵对象的格式 .
CV_CAP_PROP_MODE 后端指定值指示当前捕捉的模式.
CV_CAP_PROP_BRIGHTNESS 图像亮度 (只对摄像头).
CV_CAP_PROP_CONTRAST 图像对比度 (only for cameras).
CV_CAP_PROP_SATURATION 图像饱和度 (only for cameras).
CV_CAP_PROP_HUE 色调 (only for cameras).
CV_CAP_PROP_GAIN 增益(only for cameras).
CV_CAP_PROP_EXPOSURE 曝光(only for cameras).
CV_CAP_PROP_CONVERT_RGB 布尔型标记图像是否应该被转换为RGB.
CV_CAP_PROP_WHITE_BALANCE 白平衡（目前不支持）
CV_CAP_PROP_RECTIFICATION 立体相机的矫正标记(note: only supported by DC1394 v 2.x backend currently)

VideoCapture cap(argv[1]);
int frame_format = cap.get(CV_CAP_PROP_FORMAT);
cap >> image;
int image_type = image.type();
16 (CV_8UC3)