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Changed initial estimation for F in fisheye calibration by asmorkalov · Pull Request #25030 · opencv/opencv · GitHub
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Changed initial estimation for F in fisheye calibration #25030
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Credits to Linfei Pan
Extracted from #24052
For the initialization of intrinsics for fisheye camera models, the assumption of the field of view is too drastic: on the corner of the image, the calculated field of view would be larger than 180 degrees, which will cause numerical problems.
Discussion: #23962
Pull Request Readiness Checklist
See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request
Patch to opencv_extra has the same branch name.