contrib/mul/vil3d/algo/vil3d_suppress_non_max_edges.h File Reference

Given gradient image, compute magnitude and zero any non-maximal values. More...

#include <vil3d/vil3d_image_view.h>

Go to the source code of this file.

Functions
template<class srcT >
void	vil3d_suppress_non_max_edges (const vil3d_image_view< srcT > &world_grad, const vil3d_image_view< srcT > &grad_mag, double voxel_width_i, double voxel_width_j, double voxel_width_k, srcT grad_mag_threshold, vil3d_image_view< srcT > &max_grad_mag)
	Given gradient images, computes magnitude image containing maximal edges.

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Detailed Description

Given gradient image, compute magnitude and zero any non-maximal values.

Author:

Tim Cootes

Definition in file vil3d_suppress_non_max_edges.h.

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Function Documentation

template<class srcT >

void vil3d_suppress_non_max_edges	(	const vil3d_image_view< srcT > &	world_grad,
		const vil3d_image_view< srcT > &	grad_mag,
		double	voxel_width_i,
		double	voxel_width_j,
		double	voxel_width_k,
		srcT	grad_mag_threshold,
		vil3d_image_view< srcT > &	max_grad_mag
	)

Given gradient images, computes magnitude image containing maximal edges.

Points with gradient magnitude above a threshold are tested against gradient along normal to the edge and retained only if they are higher than their neighbours.

Gradient images are assumed to be in units of (intensity change) per world unit. (ie the output of vil3d_world_gradients)

Note: Currently assumes single plane only. 2 pixel border around output set to zero. If two neighbouring edges have exactly the same strength, it retains both (ie an edge is eliminated if it is strictly lower than a neighbour, but not if it is the same as two neighbours).

Points with magnitude above a threshold are tested against gradient along normal to the edge and retained only if they are higher than their neighbours.

Gradient images are assumed to be in units of (intensity change) per world unit. (ie the output of vil3d_world_gradients)

Note: Currently assumes single plane only. 2 pixel border around output set to zero. If two neighbouring edges have exactly the same strength, it retains both (ie an edge is eliminated if it is strictly lower than a neighbour, but not if it is the same as two neighbours).

Definition at line 32 of file vil3d_suppress_non_max_edges.txx.