I have an image that was rotated to an unknown angle, and I don’t have the original image. How I determine the angle of rotation with matlab commands?
I need to rotate the image back with this angle to reach the original image.
Share
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have an image that was rotated to an unknown angle, and I don’t have the original image. How I determine the angle of rotation with matlab commands?
I need to rotate the image back with this angle to reach the original image.
As @High Performance Mark mentions in his comment, it is difficult to give an answer when it is unclear how you can recognize that the image is rotated, or what would make you decide that the rotation has properly been corrected.
In other words, you will first have to find a way to determine the rotation angle by analyzing the image with respect to specific features that inform you about a potential rotation. For example, if your image contains a face, you’d do face detection (for which there is plenty of code on the File Exchange and then rotate so that the eyes are up and the mouth down. If your image contains lines that should be vertical and/or horizontal in an un-rotated image, you can apply a Hough-transform to your image and find the most likely angle of rotation using houghpeaks.
Finally, to rotate your image, you can use imrotate.