How to calibrate the fisheye camera well?
Hello all,
I use the opencv funtion which is fisheye model (link) to do the fisheye calibration work.
My image is Circular fisheye like this (link). And I get the result from the opencv fisheye model function like this (link).
Actually, I don't know why the result isn't a perfect circle. it is oval. I am not real make sure it is sucess or fail? and does any boday know opencv fishey model is use for Circular fisheye image to calbration or not?
And then I not understand why it is not in the image center which is using the cv::fisheye::calibrate function to get the Cx Cy parameter in K?
In the final, did any body know what is the tips (picture number, angle and position...) on use checkboard to get the corrent camera matrix and Distortion factor?
Thank all for your response~ ~