How to detect the corners of a square in a binary image

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Yannic Ellhotka
Yannic Ellhotka 2018-11-15
回答： Image Analyst 2018-11-19
Hello,
I have a binary image of white square with slightly rounded corner on a black background. I need to get the coordinates of all 4 corners. I tried something like that:
[rows, columns] = find(BW);
topRow = min(rows)
bottomRow = max(rows)
leftColumn = min(columns)
rightColumn = max(columns)
This doesn’t always work because the square doesn’t always have right angles.
example iamge.
T1_6.jpg

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回答（2 个）

Yash Ubale
Yash Ubale 2018-11-19
Hello,
Try using Hough transform to find lines in the image. After finding the lines, find the left-most, right-most, top-most and bottom-most lines. When you get these lines, just find their intersections to find the four corners of the square. Before doing so, I would suggest to erode the image with 'square' structuring element of width say 75, to remove the noise around the square.
Hough transform - https://www.mathworks.com/help/images/ref/hough.html
Image Analyst
Image Analyst 2018-11-19
See my attached shape recognition demo. It will show you how you can locate vertices by finding boundaries and plotting distances of the boundary points from the centroid and then looking for peaks.

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