MATLAB Answers

Remove SURF points according to scales

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muhammad faiz
muhammad faiz on 30 Dec 2016
Answered: Anand on 30 Dec 2016
Hai,
I would like to remove any SURF points that having scales less than 2. how can i do that?
please help.

  2 Comments

John D'Errico
John D'Errico on 30 Dec 2016
HUH? Slow down. Ask your question clearly.
Apparently you have a surface, generated by surf. I think?
You don't want to plot some part of the surface?
What is a scale? Maybe something that you weigh yourself with?
muhammad faiz
muhammad faiz on 30 Dec 2016
i'm sorry...its a SURF points from the computer vision toolbox. (SURF detector). Basically, i have lot of SURF points generated by the SURF detector from the image that i have. However, i only needs points that have Scales highers than 0.5. therefore, i want remove any points lower than that scale.

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Answers (2)

KSSV
KSSV on 30 Dec 2016
[x,y,z] = peaks(100) ;
figure(1)
surf(x,y,z)
% remove less then 2
z(z<2) = NaN ;
figure(2)
surf(x,y,z)

  2 Comments

muhammad faiz
muhammad faiz on 30 Dec 2016
this is about SURF points from computer vision toolbox. i think it is different from the answer that you gave.
Image Analyst
Image Analyst on 30 Dec 2016
That's why it helps to list toolboxes in the Products section. I did that for you but you should do it yourself from now on.

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Anand
Anand on 30 Dec 2016
% Read an image
I = imread('cameraman.tif');
% Compute SURF features
points = detectSURFFeatures(I);
% Filter out points with scale less than 2
newPoints = points( points.Scale<2 );
% Plot points
imshow(I);
hold on;
plot(newPoints);

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