Extract region/outline coordinates using ginput

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Jane Bat
Jane Bat am 11 Okt. 2017
Kommentiert: Image Analyst am 12 Okt. 2017
Hi, I have to boundary line over a coin. My question is how can I get only the region coordinates which is marked by two ginput crosshairs.
Thanks in advance.
I = imread('coins.png');
imshow(I)
BW = im2bw(I);
imshow(BW)
dim = size(BW)
col = round(dim(2)/2)-90;
row = min(find(BW(:,col)))
boundary = bwtraceboundary(BW,[row, col],'N');
imshow(I)
hold on;
plot(boundary(:,2),boundary(:,1),'b','LineWidth',2);
[x, y] = ginput(2);
plot(x, y,'r+','MarkerSize', 11);

Antworten (1)

Image Analyst
Image Analyst am 11 Okt. 2017
I'm not sure what you want to do. You can get the boundaries of all binary blobs using bwboundaries(), not bwtraceboundary():
boundaries = bwboundaries(BW);
Beyond that, I have no idea what you're trying to do by asking the user to click two points somewhere in the image.
  6 Kommentare
Jane Bat
Jane Bat am 12 Okt. 2017
Can you please add an example script. Thank you very much
Image Analyst
Image Analyst am 12 Okt. 2017
Did you see the example in the documentation? Probably not. So look at it. You can get the x and y coordinates like this:
[cx,cy,c] = improfile(I)

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