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vlchange_filter
NAME
vlchange_filter - Change the
splatting filter type and its parameters
SYNOPSIS
#include <parvox.h>
void vlchange_filter(char* filter_type, float sigma,
float radius);
DESCRIPTION
ParVox
uses three different filters to construct the kernel for the splatting
algorithm, namely, Gaussian filter, Max filter, Box filter, or none.
filter_type can be one of the four choices, "gaussian", "max", "box", or
"pt" with "pt" representing point sampling without filter. The selection
of the filter and its parameters determines the quality of the rendered
image and the rendering time. Gaussian filter is the highest quality
filter used in Parvox where sigma defines the spread of the kernel.
A sigma of 2.5 is equivalent to a spread of 160 percent, in other words,
the tail of the Gaussian kernel stops 60% of the way to the next voxel.
Max filter is a 1-D square root filter and the radius defines the
normalized distance from the center of the kernel. Box filter is a box
(at value 1) filter with radius defining the spread of the filter.
Point sampling simply projects the voxel to the image space as a point
source and resamples it to the nearest pixel, no splatting is applied.
SEE ALSO
DIAGNOSTICS
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This page,
http://pat.jpl.nasa.gov/public/ParVox/API/vlchange_filter.html,
is maintained by
and was last modified Wednesday, 09-Mar-2005 16:31:46 PST
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