how to detect shapes in an image?

Question

I want to detect a circle, rectangle shaped object in an image and read the information from that object. Is there any api in java which will be helpful to me?

Ex: Detect a round shaped coin in a white background and obtain information about that that coin like ( value of a coin, etc.)

Thanks.

This is something i did in my artificial intelligence course. We did something similar like detecting the #7 in an image, distinguishing faces, etc. but we used Python. Or maybe use the Canny Edge Detection algorithm? — Matthew, Apr 02 '11 at 11:16

score 4 · Answer 1 · edited May 23 '17 at 10:30

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Here's an answer to a similar question for C++.

For Java, you can use the OpenCV wrappers. However, once you understand the essence of the approach you should be able to solve your problem using whichever framework is available.

edited May 23 '17 at 10:30

Community

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answered Apr 02 '11 at 13:10

mpenkov

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score 2 · Answer 2 · edited Sep 24 '22 at 11:46

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Circles are perfect targets for the Hough transform. Check this out Detect circles with HT and OpenCV

Rectangles are a bit harder since the Hough Transform is not rotation invariant. You can go into edge detection and fast fitting (Fast line and rectangle detection by clustering and grouping)

edited Sep 24 '22 at 11:46

Glorfindel

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answered Apr 03 '11 at 15:56

code-gijoe

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how to detect shapes in an image?

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