# NAME

get_approximate_error_hull_data - Gets approximation of convex hull error data
# SYNOPSIS

#include "h/h_misc.h"
Example compile flags (system dependent):
-DLINUX_X86_64 -DLINUX_X86_64_OPTERON -DGNU_COMPILER
-I/home/kobus/include
-L/home/kobus/misc/load/linux_x86_64_opteron -L/usr/lib/x86_64-linux-gnu
-lKJB -lfftw3 -lgsl -lgslcblas -ljpeg -lSVM -lstdc++ -lpthread -lSLATEC -lg2c -lacml -lacml_mv -lblas -lg2c -lncursesw
int get_approximate_error_hull_data
(
Matrix **error_mpp,
const Matrix *mp,
int block_size,
const Hull *hp
);

# DESCRIPTION

This routine is a support routine for expand_hull, which is exported because
it is also used in the gamut program. It is likely too specialized to be
considered a double library module.
It takes a matrix pointed to "mp" which is assumed to be divided into
consective row blocks, consisting of "block_size" rows each. The blocks are
assumed to be various error points (such as the corners of an error box)
which, in order to reduce convex hull precision problems, need to be
distilled into one point. This routine does this by choosing the point which
is furthest from the hull "hp" (expensive!). The target matrix **error_mpp
will end up having (mp->num_rows / block_size) rows, and mp->num_cols,
columns.
# RETURNS

NO_ERROR on success, and ERROR on failure, with an error message being
set.
# WARNING

It is assumed that at least one of the points is either on the hull
boundary, or outside the hull boundary. In other-words, all points in an
error block cannot be inside the hull. We include this check, because
error invariably expands hulls, and proceeding naively with the point
which is closest to the boundary, even if it is well inside the hull,
would contract the hull in that region.
# DISCLAIMER

This software is not adequatedly tested. It is recomended that
results are checked independantly where appropriate.
# AUTHOR

Kobus Barnard
# DOCUMENTER

Kobus Barnard
# SEE ALSO

get_interior_distance_to_hull
,
get_distance_to_hull
,
expand_hull
,
trim_2D_hull