Description:
The SteerableFilter module computes the orientation and the magnitude of the gradient at a local area of the image
(Freeman, W.T. and Adelson, A.H. (1991). The design and use of steerable filters.
IEEE Trans. Patt. Anal. and Machine Intell. 13: 891-906). The
computation is performed either in Fourier or real space, depending on the dimensions of the image. When pressing the Apply
button four outputs are generated, an image with the eigenvalues and three images with the eigenvectors in x, y and z direction. These
can combined in order to visualize e.g. filament or flow-like structures using the IDSL module from Amira.
The module is only available in the Linux version.
Ports:
Space
This radio box defines the space for the filter.
Sigma
This number field defines the variance for smoothing the image in the Fourier space.
The port is only visible when the port Space is set to fourier.
Kernel size
This number field defines the size for the gaussian kernel in the real space. Only odd numbers and values higher than 3 are
allowed. A filter with a Kernel_size of 1 makes no sense.
The port is only visible when the port Space is set to real.
Type
This radio box defines the type for the eigenvalue and eigenvector computation.
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