How to split segmented object to different zones

Hi all, I have an image of plant root segmented based on contrast. I did calculate the length of the segmented root. Now I would like to mark 3 different zones on the root based on 3 different lengths from a given point. How I can do this? I thought I will define a 3 circles with 3 radiuses and retrieve the union area with the segmented root each time. But this is not good because large radius will capture another feature in the image. I think there is a way to split the segmented object in a given point. Thank you, HM

Answer 1

[Image Analyst]

You need to label your binary image and extract just the one label you want before you start masking with the circle.

labeledImage = bwlabel(binaryImage);
labelNumberThatIWant = 42; % whatever ....
desiredBinary = labeledImage == labelNumberThatIWant;

[Hassan]

Thank you, sometimes the root is curved "U" shape, so the long distance between the start and the end point of the U is much longer than the geometrical distance. In this case the radius will be very big and will include other parts of the root that are not belonging to the zone. HM

[Image Analyst]

My answer will still work.

[Hassan]

I will try it, Thank you, HM