SIFT detections are not symmetrical and weak

[777Gerald777]

System Information

SIFT detections seems to be asymmetrical and bad, see example detection:

i tested it on latest opencv 4.7.0

Detailed description

detection should be rotation invariant and therefor symmetrical

Steps to reproduce

Create an empty white image, create a black square and make a SIFT detection. Only the center and one of the 4 corners gets detected, so its not symmetrical. SIFT corner detector seems to perform much worser than those from other SIFT toolkits

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)

[Animesht1008]

hi can i work upon this issue if it is assigned to any contributor?