Remove SURF points according to scales

Hai,

I would like to remove any SURF points that having scales less than 2. how can i do that?

please help.

[John D'Errico]

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]

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.

Answer 1

[KSSV]

[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)

[muhammad faiz]

this is about SURF points from computer vision toolbox. i think it is different from the answer that you gave.

[Image Analyst]

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.

[Priodyuti Pradhan]

It's really helpful for me! Thanks for sharing!

Answer 2

[Anand]

% 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);