camera FPS code in C++

Technical C/C++
1

Has anyone found out what we should use to set the camera FPS in c++. I noticed that there appears to be several ways to do it in java with the most simple being camera.setFPS(), but there appears to be nothing in the C++ wpi library that does that.

I noticed that through the driver station you have the option to change the FPS settings there, but the FPS slider in the driver station appears to do nothing. At least i see no difference in the FPS no matter what value i move the slider to. Based on what the driver station shows it seems like we are locked to 30 FPS.

2

I’m not exactly sure how you guys are streaming video, but this can be an option.

http://docs.opencv.org/2.4/modules/highgui/doc/reading_and_writing_images_and_video.html?highlight=fps#videowriter-videowriter

The documentation uses OpenCV 2.4.

3

Here is how we do it:
VideoCapture GearCap("/dev/gearcam"); // open the default camera
GearCap.set(CV_CAP_PROP_FRAME_WIDTH,inputframewidth);
GearCap.set(CV_CAP_PROP_FRAME_HEIGHT,inputframeheight);
GearCap.set(CV_CAP_PROP_FPS,gearfpsused);

You will need to figure out what your camera supports as far as FPS and frame size. This can be done following:

Regards,
K Murphy

4

sorry it put some spaces in the code where they should not have been:
VideoCapture GearCap("/dev/gearcam"); // open the default camera
GearCap.set(CV_CAP_PROP_FRAME_WIDTH,inputframewidth);
GearCap.set(CV_CAP_PROP_FRAME_HEIGHT,inputframeheight);
GearCap.set(CV_CAP_PROP_FPS,gearfpsused);

5

First (if you want to use the camera server class)
Use cs::UsbCamera camera; for USB cameras or
Use cs::AxisCamera camera; for Axis camera

Then camera = CameraServer::GetInstance()->StartAutomaticCapture();
To start capturing am image

Then camera.SetFPS(10);
To set fps

Then camera.SetResolution(480, 320);
To set resolution

Hope that helps :slight_smile:

Also for Axis cameras start automatic capture might not work so you might have to look up the command to specify an IP instead