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removal the outer boundary of bw image?

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mmm ssss 2012-1-29

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Hi all

i wrote this code

y=imread('..........bmp');
bw=im2bw(y);
b=bwboundaries(bw);
boundry=b{1};
imshow(bw);
hold on;
plot(boundry(:,2),boundry(:,1),'g');

i obtained this image http://postimage.org/image/91xxambx9/

now i need to remove the outer boundary in green color without any effect on the details inside this boundary , is this possible in matlab ? if it is possible how can this be done?

regards

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Walter Roberson 2012-1-29

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Just don't plot the green ??

mmm ssss 2012-1-29

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no , is it what you understood from my question?

i want to remove this green boundary from also original image not from only the plotted figure , i means how to get rid of this green figure , eithout any affect on the details inside it.

thanks

mmm ssss 2012-1-29

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*without any affect on the details inside it

Image Analyst 2012-1-29

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Walter, I tried but I have no idea what he wants. Apparently it's not what you or I suggested even though both suggestions were valid possible approaches according to how he unclearly worded his question.

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Image Analyst 2012-1-29

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Use morphological erosion

bw = imerode(bw, true(3));

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mmm ssss 2012-1-29

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no , it is uncorrect because after morphological operation (skeletonization) , the outer boundary of the hand still exists.

i want to remove this green boundary from the original image also , not from the plotted one only.

Image Analyst 2012-1-29

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I did not say to do skeletonization. I said to do erosion. Erosion eats away at the outermost layer of white objects in a binary image. You could do the same thing by calling bwperim and subtracting that result from the original binary image- they're equivalent. I don't even know what you did because if you did either skeletonization or erosion, you would not have the outer layer of image remain.

mmm ssss 2012-1-29

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yes , but my target is to remove the green boundary now in order not to appear when i find the image skeleton , i means this green boundary must be removed without any effect on the inside detials , this will help in get good skeleton for the inside details without the green outer boundary

mmm ssss 2012-1-29

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http://www.2shared.com/photo/PZSrQfCA/analyat1.html

http://www.2shared.com/photo/qA7LujXu/Analyst1.html

http://www.2shared.com/photo/01vj7dQ-/analyst2.html

you can see the above images as an illustration to my question

Image Analyst 2012-1-29

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I guess I'm not sure what you want then. I told you how to find the outer layer of regions in a binary image (which is where you plotted the green pixels), but you say you don't want that. Therefore I fall back to what Walter says: Just don't plot the boundaries and you will have no green boundaries plotted in the overlay above your image.

mmm ssss 2012-1-29

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thanks , but this is not what i want

regards

mmm ssss 2012-1-29

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as we now that the hand has boundary and this must be removed not from only the plotted figure , but from original image also, for example if we said that we have a square and inside it there is 3 circle and one star , we want to remove only the square boundaries , without any affecting the boundaries of the star and boundaries of 3 circles.

Image Analyst 2012-1-30

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Yes, you can get the boundary coordinates from bwboundaries, from erosion, or from bwperim. Then just set those coordinates to zero in your original image and your binary image.

mmm ssss 2012-1-30