Windows with UVC camera, you can preview, change resolution, get and change camera parameters
Windows + VS2019
Add OpenCV4.1.0 library https://sourceforge.net/projects/opencvlibrary/files/4.1.0/opencv-4.1.0-vc14_vc15.exe/download
In the project property page,Add the "include" folder in the opencv library to the include directory of its VC + + column,the "VC15/lib" folder in opencv library is added to the Library Directory of its VC + + column。And add "opencv_world410d.lib"(If it's in Release mode,add "opencv_world410.lib" ) add the additional dependencies entered in the property page linker bar.Finally, the "opencv_world410d.dll" (If it's in Release mode,add "opencv_world410.dll" ) under the folder "vc15\bin" in the OpenCV library is placed in the generated directory(Debug Directory or Release Directory).
| Interface | Function |
|---|---|
| Enum_Devices() | Enumeration camera devices |
| Get_Cameras() | Gets the cameras name and resolutions |
| Get_Camera_Filters | Gets the device Filter interface |
| Get_Camera_Resolutions(IBaseFilter* pBaseFilter) | Gets camera support resolutions |
| Get_Camera_Range(IBaseFilter* pBaseFilter,tagCameraControlProperty CameraControl, tagVideoProcAmpProperty VideoProcAmp,bool Use_IAMCameraControl = true, bool Use_IAMVideoProcAmp = true | Gets camera's properties |
| VideoCapture::open(int index, int apiPreference = CAP_ANY) | Opens the capture device for the specified index |
| VideoCapture::isOpened() | Returns true if video capturing has been initialized already. |
| VideoCapture::grab() | Grabs the next frame from video file or capturing device. |
| VideoCapture::retrieve(Mat& image, int channel=0) | Decodes and returns the grabbed video frame. |
| VideoCapture::read(Mat& image) | Grabs, decodes and returns the next video frame. |
| VideoCapture::get(int propId) | Returns the specified VideoCapture property |
| VideoCapture::set(int propId, double value) | Sets a property in the VideoCapture |
| imread(const string& filename, int flags=1 ) | Loads an image from a file. |
| imwrite(const string& filename, InputArray image, const vector& params=vector() ) | Saves an image to a specified file. |
| VideoCapture::release() | Closes video file or capturing device. |
| propId | propName | Function |
|---|---|---|
| 3 | CAP_PROP_FRAME_WIDTH | Width of the frames in the video stream. |
| 4 | CAP_PROP_FRAME_Height | Height of the frames in the video stream. |
| 5 | CAP_PROP_FPS | Frame rate. |
| 6 | CAP_PROP_FOURCC | 4-character code of codec. see VideoWriter::fourcc |
| 10 | CAP_PROP_BRIGHTNESS | Brightness of the image (only for those cameras that support) |
| 11 | CAP_PROP_CONTRAST | Contrast of the image (only for cameras) |
| 12 | CAP_PROP_SATURATION | Saturation of the image (only for cameras) |
| 13 | CAP_PROP_HUE | Hue of the image (only for cameras) |
| 14 | CAP_PROP_GAIN | Gain of the image (only for those cameras that support) |
| 15 | CAP_PROP_EXPOSURE | Exposure (only for those cameras that support) |
| 20 | CAP_PROP_SHARPNESS | Sharpness of the image (only for cameras) |
| 21 | CAP_PROP_AUTO_EXPOSURE | DC1394: exposure control done by camera, user can adjust reference level using this feature |
| 22 | CAP_PROP_GAMMA | Gamma of the image (only for cameras) |
| 27 | CAP_PROP_ZOOM | Zoom |
| 28 | CAP_PROP_FOCUS | Focus (only for those cameras that support) |
| 33 | CAP_PROP_PAN | Pan |
| 34 | CAP_PROP_TILT | Title |
| 35 | CAP_PROP_ROLL | Roll |
| 36 | CAP_PROP_IRIS | Iris |
| 37 | CAP_PROP_SETTINGS | Pop up video/camera filter dialog (note: only supported by DSHOW backend currently. The property value is ignored |
| 39 | CAP_PROP_AUTOFOCUS | Auto Focus |
| 44 | CAP_PROP_AUTO_WB | white-balance color temperature |
Note: When querying a property that is not supported by the backend used by the VideoCapture class, value 0 is returned.
This example uses the OpenCV library to call the camera, this call part of the OpenCV API,details please visit https://docs.opencv.org /4.1.0 .
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