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Sean Lawson

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Univ Wisconsin Madison

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Signal processing and Communication Systems, Image Processing, etc.

 

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Updated File Comments Rating
16 Mar 2012 Snakes: Active Contour Models Implements snakes or active contour models for image segmentation. Author: Ritwik Kumar

I have the same problem as Fan Lin.

Also, in the eterm part in interation.m, I notice that the original paper gives the formula (discarded the i,j here): eterm = (cyy.*cx.*cx -2.*cxy.*cx.*cy + cxx.*cy.*cy)./((cx.*cx + cy.*cy).^1.5); while you are using: eterm = (cyy.*cx.*cx -2.*cxy.*cx.*cy + cxx.*cy.*cy)./((1 + cx.*cx + cy.*cy).^1.5), could you please explain a little bit why you have a "1+" part in the denominator? Thank you

07 Feb 2012 2D - 2D Projective Homography (3x3) Estimation This function estimates 2D-2D projective homography between two images. Author: SasiKanth

@SasiKanth: thanks. The thing is that I think my images are affine-transformed rather than projective-transformed. I am working on Retinal OCT scans. Also, I used your build-in function to obtain the wim1 image, which is the transformed form of i1, but the registration with i2 doesn't look promising. I met the same situation when I tried SIFT algorithm. I guess it's because of the algorithm itself, if you by any chance have the similar experience, would you please offer me any knowledge? If not, thank you anyway, it's a great algorithm.

06 Feb 2012 2D - 2D Projective Homography (3x3) Estimation This function estimates 2D-2D projective homography between two images. Author: SasiKanth

Hi, I wonder how to apply the homography matrix h to the actually i1 or i2 in order to register them. MATLAB provides affine transformation while it requires the h to have [0;...;0;1] in the last column, which is not the case here. Thank you very much -Sean

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