Thread Subject:

morphological operation

Hi ! what type of morphological operation can i used (if exists) to join all the pixels along a line in a image? I explain better: i have some pixel along a line (like a semicircle) but inside this line there are holes, so i want to eliminate these holes all in the way that the line becomes 'joined'
thanks.

"CRIS" wrote in message <jujir9$qc3$1@newscl01ah.mathworks.com>...
> Hi ! what type of morphological operation can i used (if exists) to join all the pixels along a line in a image? I explain better: i have some pixel along a line (like a semicircle) but inside this line there are holes, so i want to eliminate these holes all in the way that the line becomes 'joined'
> thanks.

You can use "closure". A dilation followed by an erosion.
matlab has them built in.
Probably it's not the best for a line, it's better for solids, but it should work, provided your holes are not too big.

Try doing:
doc imdilate
doc imerode
(and also "doc imclose", which is only an imdilate followed by an imerode in a single line of command)

CRIS:
Like Luca said, you're probably looking for imclose. There is another type of thing called edge linking that doesn't round out the shapes like closing will do. See this if you're interested. http://www.csse.uwa.edu.au/~pk/Research/MatlabFns/#edgelink
ImageAnalyst

Thanks a lot!