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OpenCV

OpenCV/バックエンド

Top / OpenCV / バックエンド

OpenCV/modules/videoio/include/opencv2/videoio.hpp

クラス・関数

OpenCV/VideoCapture?

• cv::VideoCapture
• cvCreateVideoCapture?

  cap.open(deviceID + apiID);

• OpenCV/samples/cpp/videocapture_basic.cpp

OpenCV/VideoWriter

• cv::VideoWriter
• cvCreateVideoWriter

モード

• cv::BackendMode::MODE_CAPTURE_BY_INDEX?	device index
  cv::BackendMode::MODE_CAPTURE_BY_FILENAME?	filename or device path (v4l2)
  cv::BackendMode::MODE_WRITER	writer
  cv::BackendMode::MODE_CAPTURE_ALL?	MODE_CAPTURE_BY_INDEX + MODE_CAPTURE_BY_FILENAME

一覧

• ビルドオプション	cv::VideoCaptureAPIs (OpenCV 3.2～)	C API (OpenCV 1.0～)				Capabilities
  	cv::CAP_ANY?	CV_CAP_ANY?	0	Auto detect == 0
  WITH_VFW	cv::CAP_VFW	CV_CAP_VFW	200	Video for Windows (obsolete, removed)	OpenCV 4.0で廃止
  	cv::CAP_V4L?	CV_CAP_V4L?	200	V4L/V4L2 capturing support via libv4l
  	cv::CAP_V4L2?	CV_CAP_V4L2?	CAP_V4L	Same as CAP_V4L
  	cv::CAP_FIREWIRE?	CV_CAP_FIREWIRE?	300	IEEE 1394 drivers
  	cv::CAP_FIREWARE?	CV_CAP_FIREWARE?	CAP_FIREWIRE	Same as CAP_FIREWIRE
  	cv::CAP_IEEE1394?	CV_CAP_IEEE1394?	CAP_FIREWIRE	Same as CAP_FIREWIRE
  	cv::CAP_DC1394?	CV_CAP_DC1394?	CAP_FIREWIRE	Same as CAP_FIREWIRE
  	cv::CAP_CMU1394?	CV_CAP_CMU1394?	CAP_FIREWIRE	Same as CAP_FIREWIRE
  	cv::CAP_QT?	CV_CAP_QT?	500	QuickTime	OpenCV 4.0で廃止
  	cv::CAP_UNICAP?	CV_CAP_UNICAP?	600	Unicap? drivers	OpenCV 4.0で廃止
  WITH_DSHOW	cv::CAP_DSHOW	CV_CAP_DSHOW	700	DirectShow (via videoInput)		CbI
  	cv::CAP_PVAPI?	CV_CAP_PVAPI?	800	PvAPI?, Prosilica GigE SDK
  	cv::CAP_OPENNI?	CV_CAP_OPENNI?	900	OpenNI (for Kinect)
  	cv::CAP_OPENNI_ASUS?	CV_CAP_OPENNI_ASUS?	910	OpenNI (for Asus Xtion)
  	cv::CAP_ANDROID?	CV_CAP_ANDROID?	1000	Android - not used
  	cv::CAP_XIAPI?	CV_CAP_XIAPI?	1100	XIMEA Camera API
  	cv::CAP_AVFOUNDATION?	CV_CAP_AVFOUNDATION?	1200	AVFoundation framework for iOS (OS X Lion will have the same API)		CA,W
  	cv::CAP_GIGANETIX?	CV_CAP_GIGANETIX?	1300	Smartek Giganetix GigEVisionSDK
  WITH_MSMF	cv::CAP_MSMF	CV_CAP_MSMF	1400	Microsoft Media Foundation (via videoInput)	OpenCV 3.4.2～ON	CA,W
  	cv::CAP_WINRT?	CV_CAP_WINRT?	1410	Microsoft Windows Runtime using Media Foundation
  	cv::CAP_INTELPERC?	CV_CAP_INTELPERC?	1500	Intel Perceptual Computing SDK
  	cv::CAP_REALSENSE?	CV_CAP_REALSENSE?	1500	Synonym for CAP_INTELPERC (Intel RealSense)	OpenCV 4.1～
  	cv::CAP_OPENNI2?	CV_CAP_OPENNI2?	1600	OpenNI2? (for Kinect)
  	cv::CAP_OPENNI2_ASUS?	CV_CAP_OPENNI2_ASUS?	1610	OpenNI2? (for Asus Xtion and Occipital Structure sensors)
  	cv::CAP_GPHOTO2?	CV_CAP_GPHOTO2?	1700	gPhoto2 connection
  WITH_GSTREAMER	cv::CAP_GSTREAMER?	CV_CAP_GSTREAMER?	1800	GStreamer	OpenCV 3.1～	CA,W
  WITH_FFMPEG	cv::CAP_FFMPEG	CV_CAP_FFMPEG	1900	Open and record video file or stream using the FFMPEG library	OpenCV 3.1～	CbF,W
  	cv::CAP_IMAGES	CV_CAP_IMAGES?	2000	OpenCV Image Sequence (e.g. img_%02d.jpg)	OpenCV 3.1～	CbF,W
  	cv::CAP_ARAVIS?	CV_CAP_ARAVIS?	2100	Aravis SDK?	OpenCV 3.2～
  	cv::CAP_OPENCV_MJPEG?		2200	Built-in OpenCV MotionJPEG codec	OpenCV 3.3～	CbF,W
  	cv::CAP_INTEL_MFX		2300	Intel Media SDK	OpenCV 3.3～	CbF,W
  	cv::CAP_XINE?		2400	XINE? engine (Linux)	OpenCV 3.4.2～

主な変更点

OpenCV 4.1.0

• Dynamically loaded videoio backends (FFmpeg, GStreamer)
  • https://github.com/opencv/opencv/pull/13677

OpenCV 4.0

• videoio: drop obsolete backends
• https://github.com/opencv/opencv/commit/5869415a57524cf2dfb5eaba5aafa86ceb395d15#diff-6b6143878d92aa4ec02f65c59109edf2
• ビルドオプションから削除

  バックエンド	ビルドオプション		cv::VideoCaptureAPIs
  VFW	WITH_VFW	HAVE_VFW?	CAP_VFW?
  QuickTime/QtKit?	WITH_QUICKTIME?/WITH_QTKIT?	HAVE_QTKIT?
  Unicap?	WITH_UNICAP?	HAVE_UNICAP?
  DC1394? (1st version) / CMU1394?	WITH_1394?	HAVE_DC1394?

OpenCV 3.4.4

• WITH_VFW

  OFF (IF WIN32)

  (deprecated, consider using MSMF)

OpenCV 3.4.2

• Enabled MSMF-based VideoIO by default

  WITH_MSMF

  ON (IF WIN32)

• videoio: backends priority list
  • https://github.com/opencv/opencv/commit/cd9e43704e0082c0fdd4bdef2d2631daa531fe2e#diff-025219446785708058c4098c73ac3067
• cv::videoio_registry

  cvCreateCameraCapture	cv::VideoBackendRegistry::getAvailableBackends_CaptureByIndex
  VideoCapture::open	cv::VideoBackendRegistry::getAvailableBackends_CaptureByIndex
  VideoWriter::open	cv::VideoBackendRegistry::getAvailableBackends_Writer?

OpenCV 3.3

• Support for hardware-accelerated video encoding/decoding using Intel GPUs through Intel Media SDK has been implemented for Linux (in the form of backends for cv::VideoCapture and cv::VideoWriter
• VideoWriter::openが変更()
  • bool VideoWriter::open(const String& filename, int _fourcc, double fps, Size frameSize, bool isColor)
  • bool VideoWriter::open(const String& filename, int apiPreference, int _fourcc, double fps, Size frameSize, bool isColor)

OpenCV 3.2

• 追加: VideoCapture::open(int cameraNum, int apiPreference)

OpenCV 3.1

• allow specifying apiPreference in VideoCapture when opening a file
  • https://github.com/opencv/opencv/commit/41d8c4d8790ac46bffec1206daccf5d61fefc0ab
• apiPreferenceが追加

OpenCV 2.3

• FFmpeg bindings are now available for all Windows users via compiler- and configuration- and version-independent opencv_ffmpeg.dll (for 32-bit compilers) and opencv_ffmpeg_64.dll (for 64-bit compilers).

関連

• cv::VideoCapture/バックエンド