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applying kmeans for ROI in Image

Asked by FIR on 31 Jan 2013
I have a image below
http://imgur.com/RsRHy2V
here i have detected surf features and have draw circle over it,now i want to apply k means for that surf features inside that blue circle,please assist
for whole image i used code
cform = makecform('srgb2lab');
lab_he = applycform(I,cform);
he=I;
ab = double(lab_he(:,:,2:3));
nrows = size(ab,1);
ncols = size(ab,2);
ab = reshape(ab,nrows*ncols,2);
nColors = 3;
% repeat the clustering 3 times to avoid local minima
[cluster_idx cluster_center] = kmeans(ab,nColors,'distance','sqEuclidean', ...
                                      'Replicates',3);

but how to apply for surffeatures inside circle

4 Comments

FIR on 31 Jan 2013

how to select those surf features

Lester Lim on 31 Jan 2013

use roipoly, after drawing the ROI, double click it to give mask...

FIR on 31 Jan 2013

but rioploy gives a binary image , i need to apply k means surf features

FIR

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1 Answer

Answer by Image Analyst on 31 Jan 2013

Get a mask for each circle (say by using code from the FAQ) and then get the pixel values inside by doing:

pixelValuesInsideCircle = grayImage(circleMask);

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