| Name: | arraylib::GaborPatch - Return a two-dimensional array with Gabor function.
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| Synopsis: |
nrows ncols GaborPatch -> [[] .. []]
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| Parameters: |
nrows: number of rows of the result matrix.
ncols: number of columns of the result matrix.
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| Description: |
This function returns a matrix of nrows by ncols, with the amplitudes
of a Gabor function, computed over the range of [x_min,x_max] by [y_min,y_max].
These and other parameters can be set by changing the function's options.
An orientation of 0 RAD results in a vertically oriented Gabor.
An orientation of Pi/2 results in an horizontally oriented Gabor.
Angles are measured counter clockwise from the positive x-axis.
The implementation follows the description given by
N. Petkov and R. Kruizinga Biol.Cybern. 76, 83-97 (1997).
Note that GaborPatch automatically performs a coordinate transformation
from the mathematical x-y plane to the matrix row-column system.
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| Options: |
Options which determine the argument range of the Gabor patch.
x_min doubletype - smallest x coordinate value [-2Pi]
x_max doubletype - largest x coordinate value. [ 2Pi]
y_min doubletype - smallest y coordinate value. [-2Pi]
y_max doubletype - largest y coordinate value. [ 2Pi]
Options which determine the Gabor function:
lambda doubletype - Wavelength of the Gabor in RAD. [ 2Pi]
phase doubletype - Phase of the Gabor in RAD. [ 0.0]
orientation doubletype - Rotation of the Gabor in RAD [ 0.0]
sigma doubletype - Width of the Gaussian envelope. [ Pi]
gamma doubletype - Spatial aspect ratio. [ 1.0]
The options correspond to the status dictionary entries of the
gabor_device. Thus, it is possible to use the option dictionary
of the GaborPatch to set the properties of a gabor device.
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| Author: | Marc-Oliver Gewaltig
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| References: | Petkov N and Kruizinga P: Biol. Cybern. 76, 83-96 (1997)
| SeeAlso: | gabor_ |
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| Source: | /home/abuild/rpmbuild/BUILD/nest-2.4.1/lib/sli/arraylib.sli
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