how to refine the extrinsic parameters of fisheye camera?

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Hi everybody:
I have had the intrinsic parameters of a fisheye camera. when I'm calibrating the extrinsic paramters of fisheye camera by using the build-in function of extrinsics(), I found the accuracy is not high. After i looked the source code of extrinsics(), i found it does not refine extrinsic paramters. So, my question is as follows:
1. how can i refine the extrinsics paramters?
2. can i use LM optimiztion algorthm refine the extrinsics? how to use?
has anybody give a hint ?
thank you!
  2 Comments
Bjorn Gustavsson
Bjorn Gustavsson on 24 Sep 2020
What is your use-case. For one type of use I have a reasonably good tool.
Ron Leonard
Ron Leonard on 27 Sep 2020
the use-case as follows:
I have four fisheye camera on a vehicle model. i got the bird's eye view of every camera based on the same virtual camera on the top of the vehicle's center. then , i stiching the four bird's eye view.
cause the stitching results is not very perfect. so i want to improve the accuracy of the camera extrinsic parameters.

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