boundary identification

[wadehenning]

Tim,

Once I have used something like imedge to detect the edges in an image (for example, the contours in a set of separated coffee beans) is there a function that will return the individual contours as a cell array or other object? Similar to Matlab bwboundaries? Or can you suggest another approach to identifying these types of boundaries?

Thank You,
Wade

[wadehenning]

I did not receive a reply for this question and it is still important. Is there a function that returns individual boundaries in an image? Clearly, I can write my own code for this...
Thank you.

[timholy]

Sorry there was no response. I don't know of anything that returns the boundaries, but you can use label_components to find the connected regions. I would guess that may be more useful information than the boundaries?

[timholy]

You can just say ?Images (after using Images) to get an API summary.

[wadehenning]

Thank you. We are often interested in studying the shapes of the objects that are identified in the images, where shape is defined by an object's boundary function. We didn't want to write code for this if it was already implemented by someone with more experience writing nice Julia, but we are now trying to cut the Matlab cord!

[timholy]

Then I don't think there's anything existing; you will likely need to strike out on your own. If you come up with something nice, consider sharing!

[wadehenning]

When we have something generally useful, we will be happy to share it with the community.

[pmargreff]

Hi, I'm doing some similar and using the function canny_edges to get the boundary, you can try that too.

[wadehenning]

@pmargreff how do you get the individual boundaries from the returned binary matrix? I have implemented an approach but I should improve the code. Thanks!