Extract contour from an image
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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
3 个评论
Image Analyst
2017-4-28
Attach your image so we can get an idea of what you're talking about.
Bisca
2017-5-1
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?
回答（2 个）
waleed mamdouh
2020-3-23
0 个投票
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
waleed mamdouh
2020-3-23
0 个投票
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
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2020-3-23
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