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How to extract white paper from image

asked 2017-01-05 10:55:44 -0500

smtabatabaie gravatar image

Hi, I'm new to opencv , I want to write a script for having an effect like Microsoft office lens, which can detect a piece of paper no matter the camera angle and put a rectangle around it and crop it and then unwrap it. I wanted to ask if you guys know any approaches to such problem using openCV

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Thanks very much Best

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downvoted for being all "i want", without showing any own research or skill.

(we simply can't help you, like this)

berak gravatar imageberak ( 2017-01-05 11:26:25 -0500 )edit

Thanks very much for judging @berak . As i said I'm new to opencv and looking for clues and where to start for this problem.

smtabatabaie gravatar imagesmtabatabaie ( 2017-01-05 11:30:53 -0500 )edit

admittedly, a snake-bites-tail thing. so, some clues:

  • find corners of paper sheet
  • 4 points are enough for a perspective transformation (did you even knew, what that is ?)
  • warpPerspective does the actual transformation.

(hint: this site has a search bar, too)

try some things on your own, come back with a more refined question, please.

(again, though i even halfway sympathize with your "go-bold-and-barefoot-where-angels-fear-to-thread" approach, - the world does not work like this, and we can only help you, if you understand the basics (which again are all absent in your question.)

berak gravatar imageberak ( 2017-01-05 11:38:38 -0500 )edit

Thanks very much @berak for you condescending comment.

smtabatabaie gravatar imagesmtabatabaie ( 2017-01-05 12:05:55 -0500 )edit

again, this is not a coding, but a maths problem. unless you understand the latter, we can't help you to solve the former.

berak gravatar imageberak ( 2017-01-05 12:06:45 -0500 )edit

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answered 2017-01-09 07:13:23 -0500

essamzaky gravatar image
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Asked: 2017-01-05 10:55:44 -0500

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Last updated: Jan 09 '17