Does anyone know how to calculate the focal length of a camera or know the focal vertical and horizontal lengths and the vertical and horizontal focal center of the Microsoft LiveCam HD-3000 in pixels?
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By using chiefdelphi’s search feature, I found a few threads that might be relevant. I searched for microsoft focal length and microsoft fov.
Thank you for your help but the threads don’t have the focal lengths in pixels, its in degrees. Do you have any idea how to find it?
You should look into Camera Calibration. You can calibrate the camera yourself by taking pictures of a checkerboard pattern and using OpenCV to calculate the distortion. This is a handy tutorial if you’re interested.
It looks like the creators of PhotonVision have already calculated the calibration data for the LifeCam at 320x240 (here) and 640x480 (here). This data is formatted as a matrix,
\begin{bmatrix}f_x&0&c_x\\ 0&f_y&c_y\\ 0&0&1\end{bmatrix}
Where f_x and f_y are the focal lengths, and c_x and c_y are the coordinates of the principal point. These values are measured in pixels, so they are relative to the frame resolution.
I hope this helps!
That helped a lot, thank very much for your time and effort!