Phillip
Posts:
12
Registered:
8/2/10
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Re: Image rotation detection probelm
Posted:
Dec 21, 2010 8:02 PM
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"Matt J" wrote in message <iercbt$rf9$1@fred.mathworks.com>...
> "Phillip" wrote in message <ierba4$kko$1@fred.mathworks.com>...
> >
> >
> > 1) What I said about only needing one radon projection for the reference might be true in theory, but I found in practice with noisy data that this was not so good. I've actually abandoned the radon approach.
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> Why not just increase the number of projection angles used for the reference image, so as to decrease the SNR?
I did try that when I started having issues. I didn't have much luck with it; I'm not sure why but it's probably because the angles of rotation are so small in my data. I could probably upsample the images to make this work better, but my images are quite large and I frequently have memory issues in Matlab. I liked the polar transform approach better because I was able to upsample in just the one dimension.
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