Isolate the outline of a shape.

Hello i have through binarizing and using bwpropfilt i have got the attached image, my question is : does anyone have an idea how i can isolate the outline of the shape in the middle and have it as a shape?

Answer 1

[Matt J]

Perhaps as follows?

load Image

BW=bwareafilt(Image,1);
BW=imerode(bwconvhull(BW),strel('disk',20))& ~BW;
BW=imopen(BW,ones(10,1));
BW=bwperim(bwareafilt(BW,1));

imshow(BW); zoom(3)

[Alex Perrakis]

Thanks i found a way with bwboundaries, now i have another problem.

pic01=imread("01.tiff");

pic050=imread("32.tiff");

%pic50=im2gray(pic050);

%pic1=im2gray(pic01);

newpicture=imsubtract(pic01,pic050);

%imshow(newpicture)

level = graythresh(newpicture);

level = 0.1405;

newbinpic = imbinarize(newpicture,level);

%imshowpair(newpicture,newbinpic,'montage')

newbinpic2=bwpropfilt(newbinpic,'perimeter',1);

imshowpair(newbinpic2,newpicture,'montage');

boundaries = bwboundaries(newbinpic2);

binaryImage = 0.6< newbinpic2 & newbinpic2<1;

hold on

for k=1:length(boundaries)

thisBoundary = boundaries{k};

x = thisBoundary(:,2);

y = thisBoundary(:,1);

plot(x,y,'r-','Linewidth',2);

end

I wanna somehow save the x and y coordinates and plot em in a normal plot, because this plots it on the image i linked before.

[Matt J]

Thanks i found a way with bwboundaries, now i have another problem.

If so, you should post it as a new question.