Bsoft function

img_to_surface

Source:

src/img/img_afm.c

Description:

Converts a 2D AFM image to a 3D density map.

Algorithm: 

	The 2D image is expanded in the z direction according to:

	                          voxel_density

	dens[x,y,z] = --------------------------------------

	              1+exp(factor*(z-zdis[x,y])/sigma[x,y])

	where	voxel_density is the total density attributed to a voxel

			factor = 1.618

			z - zdis[x,y] is the z distance from the surface

			sigma is a standard deviation term to describe the surface variability.

	The sigma term can be set automatically or given by an input standard deviation map.

	The position of the surface is calculated as:

	zdis[x,y] = loz + (hiz - loz)*(image[x,y] - min)/(max - min)

	where	loz and hiz are the lowest and highest points of the surface in the 3D map

			min and max are the image minimum and maximum values

Arguments:

Bimage* p2D AFM image.
Bimage* psd2D standard deviation image.
int nzz dimension of the new 3D map.
float densitydensity inside the surface (Da/A3).

Returns:

int 0.

Prototype:

int img_to_surface(Bimage* p, Bimage* psd, int nz, float density)

Functions used:

balloc
bfree
copy_img_header
img_stats

Other objects included:

struct Bimage
constant GOLDEN
constant VERB_

Generated by bdoc.pl on Mon Jun 15 11:47:12 2009

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