[ITK-users] How to Calculate Hessian Matrix from Gradient Image?

[Thomas Seidel]

Hi all,

I would like to calculate the hessian matrix and get an output of type
SymmetricSecondRankTensor pixel from a gradient image.

The irk HessianRecursiveGaussianImageFilter uses as input an intensity
image.
However, I would like to implement a method for vessel detection based on
the following algorithm:

1. GradientImageFilter
2. GradientVectorFlowImageFilter
3. get the hessian Matrix from 2. (this is my problem)
4. Hessian3DToVesselnessImageFilter


How can I get from the vector field in 2. to the hessian matrix I need for
3.?

Thanks for your help,
Thomas


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