marking line point on image and intensity profile

2013 6 23
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Hi I have an intensity profile, I wish to mark the point on it and translate the mark point to my original image.

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Image Analyst
Image Analyst 2013-6-23
You forgot to ask a question.
Josh
Josh 2013-6-28
Hi Ashvin, thanks for your reply. But I am trying to trace the intensity profile of an image to locate the region of my interest(which is the vertebrae). How do I write a function to locate the zero clusters of the profile to mark the point.

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Nitin
Nitin 2013-6-24
编辑：Nitin 2013-6-24

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Assuming you are looking for pixels with intensity, 128;
I = imread(img);
ind = find(I==128);
I(ind)=255;

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Josh
Josh 2013-6-28

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Hi Ashvin, thanks for your reply. But I am trying to trace the intensity profile of an image to locate the region of my interest(which is the vertebrae). How do I write a function to locate the zero clusters of the profile to mark the point.

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