View Full Version : Urgent help needed!!

Mikael Ara
11-12-2012, 04:40 PM
How to find Frustum parameters??

I am doing Camera Calibration, and have lot's of local cameras, and I need to render frustum, and it's viewing angle for each. I know that i can do that with intrinsic and extrinsic parameters. BUT HOW??

If my understanding is right, i need to find : nearD, farD, ratio, angle. But again, how??

p.s. I have intrinsic and extrinsic parameters, for each local camera.

11-13-2012, 12:59 AM
FOV = 2 * atan( SenzorSize / (2 * MinimalFocalLength * CurrentZoom))

Aspect depends on the with and height of the window where the picture is displayed.

Near/far clipping planes are irrelevant in your question. They just clip the viewing frustum at some distances. Just keep far/near to about 10e4 - 10e5 in order to have decent depth resolution (if depth buffer is 24-bit; otherwise make it even smaller).

Mikael Ara
11-18-2012, 11:55 AM
6.716550e+001 3.265328e+000 -6.422589e+000;
0.000000e+000 -7.718194e+001 -3.809459e+001;
0.000000e+000 0.000000e+000 -1.066025e-001

This is my matrix of intrinsic parameters of the camera. And I have no parameter you mentioned(focal length,Sensor size...).
And the chalange is how to estimate them.