Outline of an image

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Thanos Lampridis 2016-9-3

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https://ww2.mathworks.cn/matlabcentral/answers/301816-outline-of-an-image

回答： Image Analyst 2016-9-3

I have a .bmp image of one tool.I want to find the outline of the object but not with the use of imcontour but with the help of bwtraceboundary or something familiar.How can i achieve this?What will appear is a Q matrix

 and i want to convert it as a table.I'm new to matlab so there are still much things to learn.Please help.

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Answer 1

Image Analyst 2016-9-3

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First make sure you have a binary image. If you have a gray scale image, do this first

binaryImage = grayImage > 128;

Then call imclearborder() and bwboundaries()

binaryImage = imclearborder(binaryImage);
boundaries = bwboundaries(binaryImage);
x = boundaries{1}(:, 2);
y = boundaries{1}(:, 1);
hold on;
plot(x, y, 'r-', 'LineWidth', 2);