ossimFilter Class Reference

#include <ossimFilter.h>

Inheritance diagram for ossimFilter:

Public Member Functions
	ossimFilter ()
virtual	~ossimFilter ()
virtual double	filter (double x, double support) const =0
virtual NEWMAT::Matrix *	newMatrix (long width=3, double middle=0.0, double scale=0.0) const
virtual void	createMatrix (NEWMAT::Matrix &m, long width=3, double middle=0.0, double scale=0.0) const
virtual NEWMAT::RowVector *	newVector (long width, double middle=0.0, double scale=1.0) const
virtual double	getSupport () const =0

Static Public Member Functions
static double	Sinc (double x)
static double	Sinc (double x, double)

Detailed Description

Definition at line 8 of file ossimFilter.h.

Constructor & Destructor Documentation

ossimFilter()

ossimFilter::ossimFilter ( )

inline

Definition at line 11 of file ossimFilter.h.

      {}

~ossimFilter()

virtual ossimFilter::~ossimFilter ( )

inlinevirtual

Definition at line 13 of file ossimFilter.h.

{}

Member Function Documentation

createMatrix()

void ossimFilter::createMatrix ( NEWMAT::Matrix &  m, long  width = 3, double  middle = 0.0, double  scale = 0.0  ) const

virtual

Definition at line 263 of file ossimFilter.cpp.

References filter(), and getSupport().

Referenced by newMatrix().

{
   NEWMAT::ColumnVector colVec(width);
   NEWMAT::RowVector    rowVec(width);

   double t = 0.0;
   double val = 0.0;
   if(width == 1)
   {
      t = 0;
      val = filter(t, getSupport());
      colVec[0] = val;
      rowVec[0] = val;
   }
   else
   {
      for(long index = 0; index < width; index++)
      {
         t = (double)index/(double)(width-1);
         t = middle + (t - .5)*scale;
         val = filter(t, getSupport());
         colVec[index] = val;
         rowVec[index] = val;
      }
   }

   // do the outer product to construct the
   // filter matrix
   m = colVec * rowVec;
}

filter()

virtual double ossimFilter::filter ( double  x, double  support  ) const

pure virtual

Implemented in ossimTriangleFilter, ossimQuadraticFilter, ossimMitchellFilter, ossimMagicFilter, ossimLanczosFilter, ossimHermiteFilter, ossimHammingFilter, ossimHanningFilter, ossimGaussianFilter, ossimBSplineFilter, ossimCubicFilter, ossimCatromFilter, ossimBlackmanBesselFilter, ossimBlackmanSincFilter, ossimBlackmanFilter, ossimBesselFilter, ossimBesselOrderOneFilter, ossimBellFilter, ossimSincFilter, and ossimBoxFilter.

Referenced by ossimFilterTable::buildTable(), createMatrix(), newVector(), ossimScaleFilter::runHorizontalFilterTemplate(), and ossimScaleFilter::runVerticalFilterTemplate().

getSupport()

virtual double ossimFilter::getSupport ( ) const

pure virtual

Implemented in ossimTriangleFilter, ossimQuadraticFilter, ossimMitchellFilter, ossimMagicFilter, ossimLanczosFilter, ossimHermiteFilter, ossimHammingFilter, ossimHanningFilter, ossimGaussianFilter, ossimBSplineFilter, ossimCubicFilter, ossimCatromFilter, ossimBlackmanBesselFilter, ossimBlackmanSincFilter, ossimBlackmanFilter, ossimBesselFilter, ossimBesselOrderOneFilter, ossimNearestNeighborFilter, ossimBellFilter, ossimSincFilter, and ossimBoxFilter.

Referenced by ossimFilterTable::buildTable(), createMatrix(), ossimFilterResampler::getKernelSupport(), ossimScaleFilter::getSupport(), newVector(), ossimScaleFilter::runHorizontalFilterTemplate(), and ossimScaleFilter::runVerticalFilterTemplate().

newMatrix()

NEWMAT::Matrix * ossimFilter::newMatrix ( long  width = 3, double  middle = 0.0, double  scale = 0.0  ) const

virtual

Will call the filter method to create a convolution matrix. This matrix will not have normalized weights.

Will generate a matrix by creating an outer product of the 1-D filter array. This matrix will be square width-by-width.

note: the matrix is a new matrix and needs to be destroyed by the caller

Definition at line 298 of file ossimFilter.cpp.

References createMatrix().

{
   NEWMAT::Matrix *result = new NEWMAT::Matrix(width, width);

   createMatrix(*result,
                width,
                middle,
                scale);

   return result;
}

newVector()

NEWMAT::RowVector * ossimFilter::newVector ( long  width, double  middle = 0.0, double  scale = 1.0  ) const

virtual

Definition at line 312 of file ossimFilter.cpp.

References filter(), and getSupport().

{
   NEWMAT::RowVector *result = new NEWMAT::RowVector(width);


   double t = 0.0;
   double val = 0.0;
   for(long index = 0; index < width; index++)
   {
      t = (double)index/(double)(width-1);
      t = middle + (t- .5)*scale;
      val = filter(t, getSupport());
      (*result)[index] = val;
   }

   return result;
}

Sinc() [1/2]

static double ossimFilter::Sinc ( double  x )

inlinestatic

Definition at line 39 of file ossimFilter.h.

References M_PI, and x.

Referenced by ossimLanczosFilter::filter().

      {
         if (x != 0.0)
         {
            x*=M_PI;
            return(sin(x)/x);
         }
         
         return(1.0);
      }

Sinc() [2/2]

static double ossimFilter::Sinc ( double  x, double    )

inlinestatic

Definition at line 49 of file ossimFilter.h.

References M_PI, and x.

      {
         if (x != 0.0)
         {
            x*=M_PI;
            return(sin(x)/x);
         }
         
         return(1.0);
      }

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

• ossimFilter.h
• ossimFilter.cpp