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Webcam settings

What kind of camera should I use?

The following camera was used in the development of MocapForStreamer. (FOV is around 90 degree.)

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  • The wider the FOV, the wider the space for motion capture. However, MocapForStreamer calculates the 3D position with a simple pinhole camera model, so if the image is distorted like a fisheye lens, the movement cannot be captured correctly. A camera with low distortion and a wide FOV is most suitable.
  • If the frame rate is low, that value can be a bottleneck in the frame rate of the capture. Considering the performance of your PC, get cameras with a higher frame rate than that of your desired capture result. The performance of MocapForStreamer itself is, using RTX3070 for example, about 60fps.
  • HD to FHD Image size is recommended.

Camera placement

  • Place the two cameras side by side, e.g. on a PC display, so that the optical axes of the two cameras are parallel.
  • The two cameras should be placed 20-30 cm apart.

Open camera

  • In the Webcam settings section of MocapForStreamer, specify the camera on the left side as seen from the user as the Left camera and the camera on the right side as the Right camera.
  • By default, the camera is controlled using the Windows Media Foundation, but some cameras do not work. If the camera does not start correctly, specify DirectShow in the Webcam framework and reopen the camera.

May not work with USB hub

If you connect two webcams to one USB hub, you may not be able to open the camera properly.
If this is the case, try connecting directly to a USB port on your PC without using a USB hub.

Camera calibration

  • Place your face in the center of the field of view of both cameras and press "Calibrate" while looking straight at the camera.
  • Place your face in the center of the field of view of both cameras and press "Calibrate" while looking at a 45 degree angle to the camera.

To input the values manually

  • Camera Distance: Measure the distance of two cameras.
  • Focal length: Measure the distance in pixels between the center of the image and a point 45 degree away from the camera's optical axis.