Trace the boundary of an image starting from the reference.
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Hello,
I have already obtained the reference point which is inside the circle as shown in the first picture labelled(d) below. From there, how do I trace along the boundary of the image as per the direction indicated by the arrow in picture(d) such that I obtain the graph as per picture (g) which is distance versus index of boundary pixels. Thank You.
![](https://www.mathworks.com/matlabcentral/images/broken_image.png)
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Image Analyst
am 24 Jun. 2013
Did you try bwtraceboundary()?
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Image Analyst
am 25 Jun. 2013
bwtraceboundary should not be in a loop. It gets all the boundary pixels in one shot. If I were you though, I'd use bwboundaries() since it does not require you to specify a starting location and starting direction. As long as you don't care about that (most people don't), it's easier.
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