DIPlib Documentation - ©1995-2008 Quantitative Imaging Group, Delft University of Technology.

VarianceFilter

Sample Variance Filter

SYNOPSIS

#include "dip_filtering.h"

dip_Error dip_VarianceFilter ( in, out, se, boundary, filterSize, shape )

DATA TYPES

binary, integer, float

FUNCTION

This function calculates for every pixel the sample variance of the pixels in the filter window (it size specifiied by filterSize).

If shape is not equal to DIP_FLT_SHAPE_STRUCTURING_ELEMENT, se is allowed to be set to zero. When shape is set to DIP_FLT_SHAPE_STRUCTURING_ELEMENT, filterParam is ignored, (and can be set to zero).

ARGUMENTS

Data typeNameDescription
dip_ImageinInput
dip_ImageoutOutput
dip_ImageseStructuring element
dip_BoundaryArrayboundaryBoundary conditions
dip_FloatArrayfilterSizeFilter sizes
dip_FilterShapeshapeFilter shape

The enumerator dip_FilterShape contains the following constants:

NameDescription
DIP_FLT_SHAPE_DEFAULTdefault structuring element, same as DIP_FLT_SHAPE_RECTANGULAR
DIP_FLT_SHAPE_RECTANGULARrectangular structuring element
DIP_FLT_SHAPE_ELLIPTICelliptic structuring element
DIP_FLT_SHAPE_DIAMONDdiamond shaped structuring element
DIP_FLT_SHAPE_PARABOLICparabolic structuring element
DIP_FLT_SHAPE_STRUCTURING_ELEMENTuse se as structuring element

NOTE

The filter shape DIP_FLT_SHAPE_PARABOLIC, as well as custom grey-value shapes, are not supported.

SEE ALSO

Kuwahara

DIPlib on-line documentation | Function reference | Global function index