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How can I detect a special pattern that may be distored due to camera angle?

asked 2013-04-25 15:00:00 -0500

Avip gravatar image

updated 2013-04-26 07:07:30 -0500

See 2 example picture with the White/Blue pattern. I tried the square.cpp from the library and it didn't detect any of the squares in the pictures. Is there any need to adjust one of the parameters?

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Please take a look at the FAQ page. This forum doesn't stimulate simple code begging. This is a Question and Answer section, meaning you address us with a problem you encountered while programming and we help you fix it. Please put in some effort... Please adapt the question or it will get closed down.

StevenPuttemans gravatar imageStevenPuttemans ( 2013-04-26 03:12:28 -0500 )edit

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answered 2013-04-26 07:21:32 -0500

Squares.cpp looks for angles that are approximately 90 degrees between two edges of a given contour. Since you have perspective and camera deformations, it will possible find the contours, but the relations in order to have a square (90° angles and same size borders) form will not get satisfied.

What you could do is define a relation of your own, which could help you detect all objects with 4 linear sides or you could perform segmentation based on color thresholding.

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Asked: 2013-04-25 15:00:00 -0500

Seen: 145 times

Last updated: Apr 26 '13