What parameters does the distortion co-efficients rely on. If I take an image with 2MP and another image with 12MP with the same camera , will the distortion co-efficients change?
According to : http://docs.opencv.org/master/d9/d0c/group__calib3d.html
The distortion coefficients do not depend on the scene viewed. Thus, they also belong to the intrinsic camera parameters. And they remain the same regardless of the captured image resolution. If, for example, a camera has been calibrated on images of 320 x 240 resolution, absolutely the same distortion coefficients can be used for 640 x 480 images from the same camera while fx, fy, cx, and cy need to be scaled appropriately.
Ah, Right. I should point out that they don't depend on resolution if you're doing the resizing and altering the camera matrix appropriately. If you're changing settings on your camera, that can be different.
So if you take your input 640x480 image and use cv::resize to make it 320x240, as long as you update your camera matrix, that's fine. If you or your camera crops out the center 320x240 pixels, that's not fine, and needs a different calibration.
@Tetragramm does the camera matrix vary for images caught in auto mode from different heights?
Depends on what auto mode is. If the focal length is constant, then all is well, no matter the height.
Asked: 2016-12-14 06:14:28 -0600
Seen: 4,862 times
Last updated: Jan 16 '17
@Tetragramm and @berak , can you please help me with this