ossimOpenCVThresholdFilter Class Reference

OpenCV Threshold Filter. More...

#include <ossimOpenCVThresholdFilter.h>

List of all members.

Public Member Functions
	ossimOpenCVThresholdFilter (ossimObject *owner=NULL)
ossimString	getShortName () const
ossimString	getLongName () const
virtual ossimRefPtr < ossimImageData >	getTile (const ossimIrect &tileRect, ossim_uint32 resLevel=0)
virtual void	initialize ()
virtual ossimScalarType	getOutputScalarType () const
ossim_uint32	getNumberOfOutputBands () const
virtual bool	saveState (ossimKeywordlist &kwl, const char *prefix=0) const
virtual bool	loadState (const ossimKeywordlist &kwl, const char *prefix=0)
Protected Member Functions
void	runUcharTransformation (ossimImageData *tile)
Protected Attributes
ossimRefPtr< ossimImageData >	theTile
	Output tile.
double	theThreshold
	Threshold value.
double	theMaxValue
	Maximum value to use with CV_THRESH_BINARY and CV_THRESH_BINARY_INV thresholding types.
int	theThresholdType
	Thresholding type (see the detailed description).

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Detailed Description

OpenCV Threshold Filter.

Applies a fixed-level threshold to array elements.

Parameters:

	src	Source array (single-channel, 8-bit or 32-bit floating point)
	dst	Destination array; must be either the same type as src or 8-bit
	threshold	Threshold value
	maxValue	Maximum value to use with CV_THRESH_BINARY and CV_THRESH_BINARY_INV thresholding types
	thresholdType	– Thresholding type (see the discussion)

The function applies fixed-level thresholding to a single-channel array. The function is typically used to get a bi-level (binary) image out of a grayscale image or for removing a noise, i.e. filtering out pixels with too small or too large values. There are several types of thresholding that the function supports that are determined by thresholdType:

• CV_THRESH_BINARY -

• CV_THRESH_BINARY_INV -

• CV_THRESH_TRUNC -

• CV_THRESH_TOZERO -

• CV_THRESH_TOZERO_INV -

Also, the special value CV_THRESH_OTSU may be combined with one of the above values. In this case the function determines the optimal threshold value using Otsu’s algorithm and uses it instead of the specified thresh. The function returns the computed threshold value. Currently, Otsu’s method is implemented only for 8-bit images.

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Member Function Documentation

bool ossimOpenCVThresholdFilter::loadState	(	const ossimKeywordlist &	kwl,
		const char *	prefix = 0
	)			[virtual]

Method to the load (recreate) the state of an object from a keyword list. Return true if ok or false on error.

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The documentation for this class was generated from the following files:

• ossimOpenCVThresholdFilter.h
• ossimOpenCVThresholdFilter.cpp