Consider that we capture a number plate image from side view or with a certain angle, then i want to find an angle captured image with zero degree?
Shrikant,
in your case the easiest way is to use homography transform which allows you to correctly transform planar object between different perspective views (map a poster to a wall; rectify a license plate, ...). If you use OpenCV, look at findHomography(), warpPerspective and perspectiveTransform();
(OpenCV) If your have 4 corners of a license plate in variable plateConrners, you can rectify it into rectifiedImage by:
vector< Point2f> plateCorners;
vector< Point2f> rectifiedCorners;
rectifiedCorners.push_back( Point2f( 0, 0 ) );
rectifiedCorners.push_back( Point2f( rectifiedImage.cols, 0 ) );
rectifiedCorners.push_back( Point2f( rectifiedImage.cols, rectifiedImage.rows ) );
rectifiedCorners.push_back( Point2f( 0, rectifiedImage.rows ) );
Mat H = findHomography( plateConrners, rectifiedCorners );
warpPerspective( originalImage, rectifiedImage, H, rectifiedImage.size() );
PS: The corners in plateCorners and rectifiedCorners must be in the same order.
I have done a project related to your question.
Github link: https://github.com/anshul-16/perspective-homography-opencv
Do read the blog for better understaning: https://medium.com/acmvit/how-to-project-an-image-in-perspective-view-of-a-background-image-opencv-python-d101bdf966bc
Hope you find this useful!
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