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How to resolve error from bwtraceboundary function

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Issara Laosuwan
Issara Laosuwan 2016-6-9
评论： Issara Laosuwan 2016-6-9
Hello! I tried using bwtraceboundary to trace the edge of object in a specific region.
im = imread('block.jpg');
im = rgb2gray(im);
BW = im2bw(im);
imshow(BW,[]);
r = 200;
c = 66;
contour = bwtraceboundary(BW,[r c],'W',8,Inf,'counterclockwise');
hold on;
plot(contour(:,2),contour(:,1),'g','LineWidth',2);
After I have computed, it return with error:
>> bwtrace
Index exceeds matrix dimensions.
Error in bwtrace (line 11)
plot(contour(:,2),contour(:,1),'g','LineWidth',2);
Please kindly help me on this issue.

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采纳的回答

Walter Roberson
Walter Roberson 2016-6-9
The starting location you provided, [r,c], does not happen to be part of any boundary.

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