Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Why does the descriptors table row have more values than max_num_features ? #831

Closed
alexs7 opened this issue Mar 22, 2020 · 2 comments
Closed

Comments

@alexs7
Copy link

@alexs7 alexs7 commented Mar 22, 2020

The descriptors table row column should show the number of descriptors for each keypoint detected in an image? If I set max_num_features to 550, then I get more than 550 in that column.

If it is set to 550 then 550 keypoints at max should be detected in an image and that would give a maximum of 550 descriptors?

@tsattler

This comment has been minimized.

Copy link
Contributor

@tsattler tsattler commented Mar 22, 2020

The way the SIFT feature extractor is extracted, it uses max_num_features as an indicator for the desired number of features. However, it can return slightly more features (as to avoid discarding a complete scale). As such, there can be more than 550 descriptors if max_num_features is set to 550.

@alexs7

This comment has been minimized.

Copy link
Author

@alexs7 alexs7 commented Mar 22, 2020

@tsattler Ok thanks!

@alexs7 alexs7 closed this Mar 22, 2020
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Projects
None yet
Linked pull requests

Successfully merging a pull request may close this issue.

None yet
2 participants
You can’t perform that action at this time.