Outer and inner contour of the image from the centroid

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Ivan Shorokhov
Ivan Shorokhov 2015-1-5
评论： Image Analyst 2015-1-5
Hello everybody,
I have following image:
I would like to find the Outer and inner contour of the image from the centroid, for example as here:
I would appreciate any help!
Thanks in advance!

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采纳的回答

Image Analyst
Image Analyst 2015-1-5
Use bwconvhull() and then bwboundaries(). The outer is the boundaries of the convex hull. To get the inner, subtract or XOR the original from the convex hull, then call bwboundaries().
  2 个评论
Ivan Shorokhov
Ivan Shorokhov 2015-1-5
编辑：Ivan Shorokhov 2015-1-5
Dear Image Analyst,
I have tried to implement your answer, but it didn't work, could you show me please how to do it right.
Here is the result and code:
close all; clc; clear all;
original=imread('LA_shape.jpg');
original = rgb2gray(original);
figure; imshow(original);
outer = bwconvhull(original,'objects',4);
subplot(2,2,1);imshow(outer);
B = bwboundaries(outer,'noholes');
subplot(2,2,2); imshow(outer);
for k=1:length(B),
boundary = B{k};
hold on;
plot(boundary(:,2), boundary(:,1));
end
inner = im2bw(original)- outer;
B2 = bwboundaries(inner,'noholes');
subplot(2,2,3);imshow(inner);
for l=1:length(B2),
boundary1 = B2{l};
hold on;
plot(boundary1(:,2), boundary1(:,1),'r');
end
hold off;
subplot(2,2,4); imshow(original);
hold on;
for l=1:length(B2),
boundary1 = B2{l};
plot(boundary1(:,2), boundary1(:,1),'r');
end
for k=1:length(B),
boundary = B{k};
plot(boundary(:,2), boundary(:,1));
end

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