calculate focal length using camera calibration
Hi everyone,
I need to calculate single focal length f, not fx nor fy from camera matrix in calibration.
thanks
Hi everyone,
I need to calculate single focal length f, not fx nor fy from camera matrix in calibration.
thanks
First of all, you can't get the focal length in metric coordinates from the camera calibration. fx and fy are given in pixels and contain both the (metric) focal length of your camera as well as the metric size of your pixel-sensors. (a smaller sensor with a lager distance from the aperture creates the same image). If your pixels are not square, fx and fy differ (although they are very similar for every camera I used so far). So if you need a single focal length somewhere, just use the mean of both values.
Asked: 2015-03-05 04:21:42 -0600
Seen: 4,094 times
Last updated: Mar 05 '15
fix focal length in calibrateCamera()
focal length fx and fy , do they change for a camera capable of zooming ?
does auto focus change focal length or intrinsic parameters?
Understanding the camera matrix
focal length in pixel from fx and fy
Creating a focal point service that only responds w/ coordinates
Conversion of camera intrinsic parameters (pixels to meter)