Curvature and Torsion calculation of image

Hi,

I have an image of an irregular 3D object. I need to calculate the normal curvature and the torsion of the image. Can anyone please help me with this?

Thanks

Mathew

[Walter Roberson]

It's a 2D projection (e.g., photo) of a 3D object? Or do you have slices?

[Mathew Cherian Carathedathu]

It is a 2D projection.

Answer 1

[Image Analyst]

I've never used them. Do you have formulas in mind? I've heard of image moments ( http://en.wikipedia.org/wiki/Image_moments and moments of inertia ( http://en.wikipedia.org/wiki/Moment_of_inertia) - maybe you can use those. What are you trying to do such that you think you need the "the normal curvature and the torsion of the image"?

[Mathew Cherian Carathedathu]

I need it to implement a shape from texture program.

[Image Analyst]

I don't have the paper for that. I would guess that it's rather involved from the talks I've seen on it. Presumably you have such a paper that you are trying to implement in MATLAB. They give a lot of help here on MATLAB code and not so much on algorithms, especially complicated ones.