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Rotate image

asked 2015-01-13 03:52:45 -0500

spinter696 gravatar image

I explain the problem. For example, I have a rotated square like a diamond , and I want to have the square in a original position as you can see your laptop's screen for example, http://pullmonkey.com/tag/gems/ and the result I want http://jwilson.coe.uga.edu/emt725/SqT.... So the first step I think is the best one is detect the borders of the image using a filter and after rotating the image basing on, for example, the left border. and putting it vertical to the bottom of the screen.

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answered 2015-01-13 04:31:45 -0500

thdrksdfthmn gravatar image

updated 2015-01-13 04:34:57 -0500

You need to detect somehow the rectangle, maybe with a threshold + findContours and then using minAreaRect, you will find the rotated rectangle. By affine transformation, you can rotate it bac to the wanted "vertical position".

BTW I cannot access the second link...

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You can use cv::getRotationMatrix2D to get the rotation/translation matrix for your transformation.

FooBar gravatar imageFooBar ( 2015-01-13 05:07:29 -0500 )edit
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yes I have forgotten about it, but I think it is mentioned in the affine transformation

thdrksdfthmn gravatar imagethdrksdfthmn ( 2015-01-13 07:26:29 -0500 )edit

Ok I will try it thank you guys

spinter696 gravatar imagespinter696 ( 2015-01-15 06:55:33 -0500 )edit
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Asked: 2015-01-13 03:52:45 -0500

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Last updated: Jan 15 '15