gradient_abs.cpp File Reference

Computes the absolute value of the gradient of the spline approximation of the image. More...

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Detailed Description

Computes the absolute value of the gradient of the spline approximation of the image.

Usage: gradient_abs( (float_image)image) -> float_image

Description: The an image can be considered as a continuous field. This function approximates the image in all directions (x, y, z), with a 1D spline. Than it calculates the absolute value of the gradient for every point in form

g[[x,y,z]] = fabs([ pd_x g, pd_y g, pd_z g ])

here 'pd_x' stands for the partial derivative in the 'x' direction.

Types supported: float 2d, float 3d

Category: signal, development ,

References:
[1] <href url="http://www.gnu.org/software/gsl"> GNU Scientific Library </href>

Author:

Laszlo Marak, 2009-2010