To Find The Centroid Of Images Using Matlab

Hi, Below I am placing my code where I need some help to proceed further.

fx = 3.5:3.5:56; fy = 2; a=128; b=128; c=512;

[x1,y1]=meshgrid(-1:2/511:+1,-1:2/511:+1); circ1=sqrt(x1.^1+y1.^1)<1;

% Aberration z8=sqrt(8).*(3.*x1.^3+3.*x1.*y1.^2-2.*x1);

[x,y] = meshgrid(-1:2/127:+1,-1:2/127:+1); circ=sqrt(x.^2+y.^2)<1; for j1 = numel(fx):-1:1 h{j1} = circ.*cos(pi*(x*fx(j1) + y*fy)); end

M = cell(c/a); M(:) = h; M = cell2mat(M');

%Fourier Transform Before Adding Aberration z1=fftshift(fft2(M,512,512)); q1=abs(z1);

figure(1) imagesc(q1); colormap gray; axis image; axis off title('Focal Spots Without Aberration');

%Fourier Transform After Adding Aberration N=exp(sqrt(-1).*(M+z8)); z2=fftshift(fft2(N,512,512)); q2=abs(z2);

figure(2) imagesc(q2); colormap gray; axis image; axis off title('Focal Spots With Aberration'); %%%%%%%%%%%%%%%%% In the above code, two figures are obtained:fig(1) & fig(2). I need to find the centroid of those white spots(crop the image to consider only the lower row of 16 white spots) in both the figures separately. It will really be a great help for me if anyone helps me out in this regard.

Thanking You!

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

Answer 1

[Image Analyst]

You code doesn't run. What is q1?

You can see how to get centroids from regions in an image (your row of "white spots") by looking at my BlobsDemo image segmentation tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862