how to track boundary in matlab

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piku mandal
piku mandal on 4 Oct 2018
Edited: JSC on 4 Oct 2018
how to track boundary of the red underlined image?

Accepted Answer

JSC
JSC on 4 Oct 2018
Edited: JSC on 4 Oct 2018
First you should read in the image:
Image=imread('03.png');
Then you can do a color conversion by thresholding on the color channels:
RedChannel=Image(:,:,1);
GreenChannel=Image(:,:,2);
%convert red areas to 1 and others to 0
Image_BW = (RedChannel>200).* (GreenChannel<100);
There is also an app for color thresholding: https://de.mathworks.com/help/images/image-segmentation-using-the-color-thesholder-app.html
Finally you can get a cell array of the boundary pixels with
B=bwboundaries(Image_BW);
and plot the result:
figure(1)
clf
imshow(Image_BW)
%Get and plot boundaries
for i=1:size(B)
Bound=B{i};
hold on
plot(Bound(:,2),Bound(:,1),'g-')
end

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