ossimFilterTable Class Reference

#include <ossimFilterTable.h>

Public Member Functions
	ossimFilterTable ()
	default constructor More...
	~ossimFilterTable ()
	destructor More...
void	buildTable (ossim_uint32 filterSteps, const ossimFilter &filter)
	Builds a table with filter being used in both x and y direction. More...
void	buildTable (ossim_uint32 filterSteps, const ossimFilter &xFilter, const ossimFilter &yFilter)
	Builds a table. More...
ossim_uint32	getWidthByHeight () const
ossim_uint32	getXSupport () const
ossim_uint32	getYSupport () const
ossim_uint32	getWidth () const
ossim_uint32	getHeight () const
const double *	getClosestWeights (const double &x, const double &y) const
	Inlined below. More...

Protected Member Functions
void	allocateWeights ()
	Creates the weight array "theWeights". More...

Protected Attributes
double *	theWeights
ossim_uint32	theWidth
ossim_uint32	theHeight
ossim_uint32	theWidthHeight
ossim_uint32	theXSupport
ossim_uint32	theYSupport
ossim_uint32	theFilterSteps

Detailed Description

Definition at line 19 of file ossimFilterTable.h.

Constructor & Destructor Documentation

ossimFilterTable()

ossimFilterTable::ossimFilterTable

(

)

default constructor

Definition at line 15 of file ossimFilterTable.cpp.

   :theWeights(0),
    theWidth(0),
    theHeight(0),
    theWidthHeight(0),
    theXSupport(0),
    theYSupport(0),
    theFilterSteps(0)
{
   
}

~ossimFilterTable()

ossimFilterTable::~ossimFilterTable

(

)

destructor

Definition at line 27 of file ossimFilterTable.cpp.

References theWeights.

{
   if(theWeights)
   {
      delete [] theWeights;
      theWeights = 0;
   }
}

Member Function Documentation

allocateWeights()

void ossimFilterTable::allocateWeights ( )

protected

Creates the weight array "theWeights".

Will delete if previously allocated.

Definition at line 134 of file ossimFilterTable.cpp.

References size, theFilterSteps, theWeights, and theWidthHeight.

Referenced by buildTable().

{
   if(theWeights)
   {
      delete [] theWeights;
      theWeights = 0;
   }

   ossim_uint32 size = (theWidthHeight*(theFilterSteps*theFilterSteps));

   if(size)
   {
      theWeights = new double[size];
   }
}

buildTable() [1/2]

void ossimFilterTable::buildTable	(	ossim_uint32	filterSteps,
		const ossimFilter &	filter
	)

Builds a table with filter being used in both x and y direction.

Definition at line 36 of file ossimFilterTable.cpp.

Referenced by ossimFilterResampler::computeTable().

{
   buildTable(filterSteps, filter, filter);
}

buildTable() [2/2]

void ossimFilterTable::buildTable	(	ossim_uint32	filterSteps,
		const ossimFilter &	xFilter,
		const ossimFilter &	yFilter
	)

Builds a table.

Definition at line 42 of file ossimFilterTable.cpp.

References allocateWeights(), ossimFilter::filter(), ossimFilter::getSupport(), theFilterSteps, theHeight, theWeights, theWidth, theWidthHeight, theXSupport, theYSupport, x, and y.

{
   ossim_int32 subpixelSample=0;
   ossim_int32 subpixelLine=0;
   double dx   = 0.0;
   double dy   = 0.0;
   double kernelH   = 0.0;
   double kernelV   = 0.0;
   double x = 0;
   double y = 0;

   double xsupport = ceil(xFilter.getSupport());
   double ysupport = ceil(yFilter.getSupport());
   double left    = 0;
   double right   = 0;
   double top     = 0;
   double bottom  = 0;

   theXSupport = (ossim_uint32)xsupport;
   theYSupport = (ossim_uint32)ysupport;
   theFilterSteps = filterSteps;
   theWidth  = (2*theXSupport);
   theHeight = (2*theYSupport);
   theWidthHeight = theWidth*theHeight;
   
   allocateWeights();
   left   = -(xsupport-1);
   right  = xsupport;
   top    = -(ysupport-1);
   bottom = ysupport;
   ossim_uint32 idx = 0;
      
   for (subpixelLine = 0; subpixelLine < (int)filterSteps; 
        subpixelLine++)
   {
     
     // Calculate subpixel sample step.
     // ---------------------------------- 
       dy = subpixelLine / (double)(filterSteps);
       for (subpixelSample = 0; subpixelSample < (int)filterSteps; subpixelSample++)
       {
        
         // Calculate subpixel sample step.
         // ---------------------------------- 
         dx = subpixelSample / (double)(filterSteps);
         
         for (kernelV=top; kernelV<=bottom;
              kernelV++)
         {
             y = kernelV - dy;
             double tempWeight = yFilter.filter(y, yFilter.getSupport());
             for(kernelH=left; kernelH<=right;++kernelH)
             {
               x = kernelH - dx;
                   
               // Get the weight for the current pixel.
               //   ----------------------------------------
               theWeights[idx] = tempWeight*xFilter.filter(x, xFilter.getSupport());
               ++idx;
             }
          }
        }
     }
}

getClosestWeights()

const double * ossimFilterTable::getClosestWeights ( const double &  x, const double &  y  ) const

inline

Inlined below.

Method inlined for speed as it is used in the inner pixel loop of ossimFilterResampler::resampleBilinearTile method.

Returns

const double* to the closest weight of x and y.

Definition at line 80 of file ossimFilterTable.h.

References theFilterSteps, theWeights, theWidthHeight, x, and y.

Referenced by ossimFilterResampler::resampleBilinearTile().

{
   // Extract the decimal part of x and y.
   double intPartDummy;
   double decimalPrecisionX = fabs(modf(x, &intPartDummy));
   double decimalPrecisionY = fabs(modf(y, &intPartDummy));
   
   ossim_int32 kernelLine =
      (ossim_int32)(theFilterSteps*decimalPrecisionY);
   ossim_int32 kernelSamp =
      (ossim_int32)(theFilterSteps*decimalPrecisionX);
  
  return &theWeights[(kernelLine*theFilterSteps +
                      kernelSamp)*theWidthHeight];
}

getHeight()

ossim_uint32 ossimFilterTable::getHeight

(

)

const

Returns

theHeight

Definition at line 129 of file ossimFilterTable.cpp.

References theHeight.

Referenced by ossimFilterResampler::resampleBilinearTile().

{
   return theHeight;
}

getWidth()

ossim_uint32 ossimFilterTable::getWidth

(

)

const

Returns

theWidth

Definition at line 124 of file ossimFilterTable.cpp.

References theWidth.

Referenced by ossimFilterResampler::resampleBilinearTile().

{
   return theWidth;
}

getWidthByHeight()

ossim_uint32 ossimFilterTable::getWidthByHeight

(

)

const

Returns

theWidth*theHeight

Definition at line 109 of file ossimFilterTable.cpp.

References theWidthHeight.

{
   return theWidthHeight;
}

getXSupport()

ossim_uint32 ossimFilterTable::getXSupport

(

)

const

Returns

theXSupport

Definition at line 114 of file ossimFilterTable.cpp.

References theXSupport.

Referenced by ossimFilterResampler::resampleBilinearTile().

{
   return theXSupport;
}

getYSupport()

ossim_uint32 ossimFilterTable::getYSupport

(

)

const

Returns

theYSupport

Definition at line 119 of file ossimFilterTable.cpp.

References theYSupport.

Referenced by ossimFilterResampler::resampleBilinearTile().

{
   return theYSupport;
}

Member Data Documentation

theFilterSteps

ossim_uint32 ossimFilterTable::theFilterSteps

protected

Definition at line 73 of file ossimFilterTable.h.

Referenced by allocateWeights(), buildTable(), and getClosestWeights().

theHeight

ossim_uint32 ossimFilterTable::theHeight

protected

Definition at line 69 of file ossimFilterTable.h.

Referenced by buildTable(), and getHeight().

theWeights

double* ossimFilterTable::theWeights

protected

Definition at line 67 of file ossimFilterTable.h.

Referenced by allocateWeights(), buildTable(), getClosestWeights(), and ~ossimFilterTable().

theWidth

ossim_uint32 ossimFilterTable::theWidth

protected

Definition at line 68 of file ossimFilterTable.h.

Referenced by buildTable(), and getWidth().

theWidthHeight

ossim_uint32 ossimFilterTable::theWidthHeight

protected

Definition at line 70 of file ossimFilterTable.h.

Referenced by allocateWeights(), buildTable(), getClosestWeights(), and getWidthByHeight().

theXSupport

ossim_uint32 ossimFilterTable::theXSupport

protected

Definition at line 71 of file ossimFilterTable.h.

Referenced by buildTable(), and getXSupport().

theYSupport

ossim_uint32 ossimFilterTable::theYSupport

protected

Definition at line 72 of file ossimFilterTable.h.

Referenced by buildTable(), and getYSupport().

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

• ossimFilterTable.h
• ossimFilterTable.cpp