Extract contour from an image

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Bisca 2017-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/337818-extract-contour-from-an-image

回答： waleed mamdouh 2020-3-23

I have a problem about extrcting contours from an image. I need the same result that can i have if using imcontour but this command show me only the boundary of image. I tried with bwtraceboundary but i have a problem with selecting the point to start the tracing.

thanks in advance

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Bisca 2017-5-1

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Thanks for the answer...I made a simple code that extract contour

clc
clear
a = imread('logo1.png');
a_gray = rgb2gray(a);
level = 0.1;
a_bw = imbinarize(a_gray,level);
Icomp = imcomplement(a_bw);
hold on
[B,L] = bwboundaries(a_bw);
imshow(label2rgb(L, @jet, [.5 .5 .5]))
%imshow(a_bw);
hold on
for k = 1:length(B)
   boundary = B{k};
   plot(boundary(:,2), boundary(:,1), 'r', 'LineWidth', 1)
end

Now, I have a doubt because i want associate coordinates in cartesian space on all point of the extrapolates contour

Image Analyst 2017-5-1

编辑：Image Analyst 2017-5-1

You again forgot to include 'logo1.png' as requested.

I'm not sure what you're asking because boundary(:,2) is the x coordinates of the boundary/perimeter of the blob, and boundary(:,1) are the y coordinates. Why don't those give you what you want?

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