Remove artefact when dilating Image

Hi. I have a hexagonal grid that I have managed to locate the location of the maximum in each feature (with the kind help of Walter & I.A)

I next want to use these locations to then get the weighted centroid to be more accurate.(i.e. use them as seeds)

But to prepare for RegionProps, I create binary image that I dilate slightly:

se = strel('disk',2);
binary=imdilate(binary,se,'same');

This works except for a little artifact shown by the redline.

I really need at least 1 pixel perimeter round the seeding locations to ensure I can perform a weighted centroid calc, but the artefact treats the 2 joined objects as one and its centroid is incorrectly position in the middle of the two blobs.

Is there away where I can break up the joined blobs but still retain enough pixels to allow centroid calc.

Thanks for any help Jason

[Jason]

anyone?

Answer 1

[Changoleon]

So what's the problem? that two objects are connected to each other? if yes, use the function imopen.

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

What it will do is it will erode the image first with a certain limit (you chose this limit) and then will dilate it again. The tiny part which is making two objects as one, will be removed

[Jason]

Hi, Im not able to use any SE in imopen to get this to work. Are there any other suggestions please.

Thanks

Answer 2

[Image Analyst]

Try this: http://blogs.mathworks.com/steve/2013/11/19/watershed-transform-question-from-tech-support/

[Jason]

Thanks. Will take a look