Image analysis

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harjan
harjan 2011-11-9
Hello everyone Can you please say how to perform rotation undoing of an image? If i have the reference image and rotated image th algorithm find out the rotation angle and perform undoing rotation. Please post your ideas......I need it urgently.........Thanks in advance...............

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Ashish Uthama
Ashish Uthama 2011-11-9
Have a look at this demo in the Image Processing toolbox.
To automate it, you could try using the corner function to obtain the control points instead of the interactive cpselect used in the example above.
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harjan
harjan 2011-11-14
Thanks a lot...Its really useful to me......But why is the resultant image get blurred?.....Is there any possiblity to overcome this.....
Walter Roberson
Walter Roberson 2011-11-14
No there is no possibility of overcoming blurring when you rotate a rectangular grid at an angle to a different rectangular grid (except, of course, in the special case of quarter turns on square grids).
There may possibly be algorithms that blur *less* than whichever algorithm is used above, but blur cannot be eliminated.

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