MATLAB: Ginput

ginputMATLAB

Hi all,
I have 160 slices(408*544*160) with a 3d patch on it. I need to find one point on each slice and take in return a 3d matrix of patch: it is my idea but it seems has a fundamental misunderstanding.
d=zeros(408,544,160);
for i=1:160
figure,imshow(image(:,:,i)),[]);
[a,b]=ginput(1);
z=image(a,b,i);
d(a,b,i)=z;
end
how can i fix it?
I was wondering if I can select random point in each slice?when I use ginput, there is noting to stop it from receiving points. How can take it in return as 3d matrix?

Best Answer

d=zeros(408,544,160);
image = rand(size(d));
for i=1:160
  figure,imshow(image(:,:,i),[]);
  [a,b]=ginput(1);
  a = round(a);
  b = round(b);
  z=image(a,b,i);d(a,b,i)=z;
end
You have to round the points returned from ginput to account for floating points. I would also recommend against opening a new figure on each iteration.
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