video format
CV_CAP_PROP_POS_MSEC 視頻當(dāng)前點(diǎn)的毫秒值或視頻捕捉的時間戳
CV_CAP_PROP_POS_FRAMES 下次將被捕獲的0基索引的幀
CV_CAP_PROP_POS_AVI_RATIO 視頻文件的相關(guān)位置: 0 - start of the film, 1 - end of the film.
CV_CAP_PROP_FRAME_WIDTH 視頻流幀的寬度
CV_CAP_PROP_FRAME_HEIGHT 視頻流幀的高.
CV_CAP_PROP_FPS 幀率.
CV_CAP_PROP_FOURCC 4字符編碼的編碼器.
CV_CAP_PROP_FRAME_COUNT 視頻文件的幀數(shù).
CV_CAP_PROP_FORMAT 由retrieve()返回矩陣對象的格式 .
CV_CAP_PROP_MODE 后端指定值指示當(dāng)前捕捉的模式.
CV_CAP_PROP_BRIGHTNESS 圖像亮度 (只對攝像頭).
CV_CAP_PROP_CONTRAST 圖像對比度 (only for cameras).
CV_CAP_PROP_SATURATION 圖像飽和度 (only for cameras).
CV_CAP_PROP_HUE 色調(diào) (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 布爾型標(biāo)記圖像是否應(yīng)該被轉(zhuǎn)換為RGB.
CV_CAP_PROP_WHITE_BALANCE 白平衡（目前不支持）
CV_CAP_PROP_RECTIFICATION 立體相機(jī)的矯正標(biāo)記(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)
