MATLAB: When you dilate and erode a binary image of a skeleton does the skeleton keep its proportion

Question

I have subtracted a pixel off the ends of a skeleton on a binary image. To get the skeleton back to the way it originally was I was trying to use dilation and erosion using bwmorph. But I can't seem to get the skeleton back to its original way. It appears that dilation and erosion keeps proportional to the skeleton. All I want to do is add back the pixel that i took off the ends? is this possible without just adding the pixels manually.

Answer 1

So I think I v found a way to do it. Its working for now, but still have to test it out on a bigger scale. So what i did was the following,

 % code
• Get skeleton image,
• Find branch points,
• Dilate branch points,
• Subtract dilated branch points from skeleton image,
• Use connected components with bwconncomp for the broken off branches,
• Use regionprops to get get pixel list of each of the branches,
• Make an image for an isolated single branch,
• Add the image of branch points to the isolated single branch image,
• Use dilation to merge the closest branch points to the single branch,
• Use thin to put dilated branch points back to single pixels,
• use clean to get rid of branch point pixels,
• skeleton the remainding single branch,
• loop through for all branches

its endpoints are now correctly back to the way they were. So this was only tested on a small scale.