The rectified image with the pinhole model 8 parameters will have curved boundary

[yunlongwang-leopard]

System Information

OpenCV version: 4.9.0.80 Operating System / Platform: windows10 Python version: 3.10.13

Detailed description

we use the pinhole model 8 parameters to do calibration. When calibrated with 8 parameters, the corrected graph will have a boundary,if we use 5 parameters, it has no boundary. some calibration file will have such case with 8 parameters while others will not.

calibration_demo.zip

Steps to reproduce

Issue submission checklist

• [X] I report the issue, it's not a question
• [X] I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• [X] I updated to the latest OpenCV version and the issue is still there
• [ ] There is reproducer code and related data files (videos, images, onnx, etc)