Can I explicitly define the size of "points" matrix returned by detectSURFFeatures function?

I am using ORL dataset for face recognition. For feature extraction I am using inbuilt function detectSURFFeatures. But the function returns different size of points matrix for different image. Is there any way I can explicitly restrict the size of points matrix it returns.

points = detectSURFFeatures(I);
% The points matrix is different for different image.

Answer 1

[Dima Lisin]

Hi Sai,

No, there is no way to explicitly restrict the number of points in the detectSURFFeatures function itself. The number of points it returns depends on the content of the image and the parameters, such as 'MetricThreshold'. However, you can limit the number of points after the fact. For example, you can use the selectStrongest method of the returned SURFPoints object to get the n strongest features.

[Sai Kumar Dwivedi]

Thank you so much for your answer.

[Dima Lisin]

You are most welcome.