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From: Vassilis on 24 Dec 2009 17:10
ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <7467001f-787b-473c-9317-adcff818b144(a)j42g2000yqd.googlegroups.com>...
> OK, then follow this procedure
> 1. convert to monochrome by using rgb2gray or by taking one of the
> three color channels.
> Then like I said before
> 2. threshold
> 3. imfill
> Now you're done! I think - well... you didn't really say what you
> want to do after this. You said only that you "need" or "want to
> keep" the region inside the outer perimeter. Thresholding and imfill
> will do that for you. Now, if you want to make some kinds of
> measurements after that, you can do:
> 4. label - either bwlabel or bwconncomp
> 5. regionprops
> 6. Filter blobs according to some property using ismember() to get a
> "keeper" subset of blobs
> It should be less than ten lines or so. Post your code if you run
> into difficulties.
are these directions for me (Vassilis) or for Kenneth?
From: ImageAnalyst on 24 Dec 2009 19:27
For Kenneth - he's the one who asked the question.
I presume you're someone else, like me, who's offering a solution to
Kenneth's situation.
From: Kenneth Galea on 26 Dec 2009 04:25
"Vassilis " <vpapa(a)ilsp.gr> wrote in message <hh0j0u$1rh$1(a)fred.mathworks.com>...
> i tried this:
> A=imread('keep_outer_obj.jpg');
> Ag = rgb2gray(A);
> A1 = imclose(255-Ag,ones(3));
> A2=im2bw(A1);
> A3=imfill(A2,'holes');
> A4= A3-imerode(A3,ones(3));
> A5=imdilate(A4,ones(3));
> [x y]=find(A5>0);
> C=uint8(ones(size(A))*255);
> for ii=1:length(x)
> C(x(ii),y(ii),:) = A(x(ii),y(ii),:);
> end
>
> is the image C what you want?

Yes. Thanks a lot. But I have to learn and understand these functions first such as imdilate and imerode since I never used them:/ Thanks for your help
From: Kenneth Galea on 26 Dec 2009 04:32
"Vassilis " <vpapa(a)ilsp.gr> wrote in message <hh0osb$d9v$1(a)fred.mathworks.com>...
> ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <7467001f-787b-473c-9317-adcff818b144(a)j42g2000yqd.googlegroups.com>...
> > OK, then follow this procedure
> > 1. convert to monochrome by using rgb2gray or by taking one of the
> > three color channels.
> > Then like I said before
> > 2. threshold
> > 3. imfill
> > Now you're done! I think - well... you didn't really say what you
> > want to do after this. You said only that you "need" or "want to
> > keep" the region inside the outer perimeter. Thresholding and imfill
> > will do that for you. Now, if you want to make some kinds of
> > measurements after that, you can do:
> > 4. label - either bwlabel or bwconncomp
> > 5. regionprops
> > 6. Filter blobs according to some property using ismember() to get a
> > "keeper" subset of blobs
> > It should be less than ten lines or so. Post your code if you run
> > into difficulties.
> are these directions for me (Vassilis) or for Kenneth?

Thanks a lot for your help. Basically my objects will not be symmetrical but any shape. Now what I'll need to do is some research on curvature-symmetry fusion in order to implement visual feedback to control the position of the robotic ARM for the best possible final grasp of the unknown object!!
From: Kenneth Galea on 26 Dec 2009 06:10
ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <7467001f-787b-473c-9317-adcff818b144(a)j42g2000yqd.googlegroups.com>...
> OK, then follow this procedure
> 1. convert to monochrome by using rgb2gray or by taking one of the
> three color channels.
> Then like I said before
> 2. threshold
> 3. imfill
> Now you're done! I think - well... you didn't really say what you
> want to do after this. You said only that you "need" or "want to
> keep" the region inside the outer perimeter. Thresholding and imfill
> will do that for you. Now, if you want to make some kinds of
> measurements after that, you can do:
> 4. label - either bwlabel or bwconncomp
> 5. regionprops
> 6. Filter blobs according to some property using ismember() to get a
> "keeper" subset of blobs
> It should be less than ten lines or so. Post your code if you run
> into difficulties.

Hi. The only problem I'm having is that when I do imfill the image is becoming all white!!! This is my code:
Ag = rgb2gray(A);
level = graythresh(Ag);
A2=im2bw(Ag,level);
A3=imfill(A2,'holes');
figure
imshow (A3)
In this case A3 is becoming white. I tried several images but still the same result. I think that the objects are not well closed. Do I need to use imclose before filling?
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