I want to find the top apexes in a BW image in matlab

I want to find the top apexes in a BW image in matlab

[Praveen GB]

This is an Example image and I want to find the top apex of each vessels

Answer 1

[Dinesh Yadav]

To solve the problem we will use concept of connected components. You can go through following steps

• To correctly get the number of disjoint objects you can use the command bwareaopen(BW,numpixels) which removes noise from the image.
• You can use the command bwconncomp to find the number of connected components. If it is more than the number of objects you see in the image, try increasing numpixels in bwareaopen until you get the same number of components you want.
• You can use the command bwlabel to get a matrix of size of your input image. This matrix will contain labels number corresponding to each object.
• From there you can find top co-ordinate for each label by traversing the matrix and recording co-ordinate for first occurrence of each object label.

You can refer following links to documentation for your further exploration.

https://www.mathworks.com/help/images/ref/bwconncomp.html

https://www.mathworks.com/help/images/ref/bwareaopen.html

https://www.mathworks.com/help/images/ref/bwlabel.html