GDALIntegralImage Class Reference

Integral image class (summed area table). More...

#include <gdal_simplesurf.h>

Public Member Functions
void	Initialize (const double **padfImg, int nHeight, int nWidth)
	Compute integral image for specified array. More...
double	GetValue (int nRow, int nCol)
	Fetch value of specified position in integral image. More...
double	GetRectangleSum (int nRow, int nCol, int nWidth, int nHeight)
	Get sum of values in specified rectangular grid. More...
double	HaarWavelet_X (int nRow, int nCol, int nSize)
	Get value of horizontal Haar wavelet in specified square grid. More...
double	HaarWavelet_Y (int nRow, int nCol, int nSize)
	Get value of vertical Haar wavelet in specified square grid. More...
int	GetHeight ()
	Fetch height of integral image. More...
int	GetWidth ()
	Fetch width of integral image. More...

Detailed Description

Integral image class (summed area table).

Author

Andrew Migal migal.nosp@m..dre.nosp@m.w@gma.nosp@m.il.c.nosp@m.om

Integral image is a table for fast computing the sum of values in rectangular subarea. In more detail, for 2-dimensional array of numbers this class provides capability to get sum of values in rectangular arbitrary area with any size in constant time. Integral image is constructed from grayscale picture.

Member Function Documentation

GetHeight()

int GDALIntegralImage::GetHeight

(

)

Fetch height of integral image.

Returns

Height of integral image (number of rows).

GetRectangleSum()

double GDALIntegralImage::GetRectangleSum	(	int	nRow,
		int	nCol,
		int	nWidth,
		int	nHeight
	)

Get sum of values in specified rectangular grid.

Rectangle is constructed from left top point.

Parameters

nRow	Row of left top point of rectangle
nCol	Column of left top point of rectangle
nWidth	Width of rectangular area (number of columns)
nHeight	Height of rectangular area (number of rows)

Returns

Sum of values in specified grid.

GetValue()

double GDALIntegralImage::GetValue	(	int	nRow,
		int	nCol
	)

Fetch value of specified position in integral image.

Parameters

nRow	Row of this position
nCol	Column of this position

Returns

Value in specified position or zero if parameters are out of range.

GetWidth()

int GDALIntegralImage::GetWidth

(

)

Fetch width of integral image.

Returns

Width of integral image (number of columns).

HaarWavelet_X()

double GDALIntegralImage::HaarWavelet_X	(	int	nRow,
		int	nCol,
		int	nSize
	)

Get value of horizontal Haar wavelet in specified square grid.

Parameters

nRow	Row of left top point of square
nCol	Column of left top point of square
nSize	Side of the square

Returns

Value of horizontal Haar wavelet in specified square grid.

HaarWavelet_Y()

double GDALIntegralImage::HaarWavelet_Y	(	int	nRow,
		int	nCol,
		int	nSize
	)

Get value of vertical Haar wavelet in specified square grid.

Parameters

nRow	Row of left top point of square
nCol	Column of left top point of square
nSize	Side of the square

Returns

Value of vertical Haar wavelet in specified square grid.

Initialize()

void GDALIntegralImage::Initialize	(	const double **	padfImg,
		int	nHeight,
		int	nWidth
	)

Compute integral image for specified array.

Result is stored internally.

Parameters

padfImg	Pointer to 2-dimensional array of values
nHeight	Number of rows in array
nWidth	Number of columns in array

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

• gdal_simplesurf.h
• gdal_octave.cpp