Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
alvar::IntegralGradient Class Reference

IntegralGradient is used for calculating rectangular image gradients rapidly More...

#include <IntegralImage.h>

Public Member Functions

void GetAveGradient (CvRect &rect, double *dirx, double *diry)
 Calculate the average gradient for the given rectangular area in the image. More...
 
void GetGradient (CvRect &rect, double *dirx, double *diry, int *count=0)
 Calculate the gradient for the given rectangular area in the image. More...
 
 IntegralGradient ()
 
void Update (IplImage *gray)
 Update intermediate images for calculating the gradients to the given image. More...
 
 ~IntegralGradient ()
 

Protected Member Functions

void CalculatePointNormals (IplImage *gray)
 

Protected Attributes

IntegralImage integx
 
IntegralImage integy
 
IplImage * normalx
 
IplImage * normaly
 

Detailed Description

IntegralGradient is used for calculating rectangular image gradients rapidly

We calculate IntegralImage:s based on point normals for 4-pixel intersections (see Donahue1992). Using the integral images it is possible to make fast gradient calculations to any image rectangle. This approach is useful when we need to calculate many gradient rectangles for the same image.

(See SampleIntegralImage.cpp)

Examples:
SampleIntegralImage.cpp.

Definition at line 136 of file IntegralImage.h.

Constructor & Destructor Documentation

alvar::IntegralGradient::IntegralGradient ( )

Definition at line 168 of file IntegralImage.cpp.

alvar::IntegralGradient::~IntegralGradient ( )

Definition at line 172 of file IntegralImage.cpp.

Member Function Documentation

void alvar::IntegralGradient::CalculatePointNormals ( IplImage *  gray)
protected

Definition at line 128 of file IntegralImage.cpp.

void alvar::IntegralGradient::GetAveGradient ( CvRect &  rect,
double *  dirx,
double *  diry 
)

Calculate the average gradient for the given rectangular area in the image.

Parameters
dirxMethod fills in the x-component of the gradient here
diryMethod fills in the y-component of the gradient here
Examples:
SampleIntegralImage.cpp.

Definition at line 187 of file IntegralImage.cpp.

void alvar::IntegralGradient::GetGradient ( CvRect &  rect,
double *  dirx,
double *  diry,
int *  count = 0 
)

Calculate the gradient for the given rectangular area in the image.

Parameters
dirxMethod fills in the x-component of the gradient here
diryMethod fills in the y-component of the gradient here
countIf this parameter is not 0 it is filled with number of pixels in the rectangle.

Definition at line 181 of file IntegralImage.cpp.

void alvar::IntegralGradient::Update ( IplImage *  gray)

Update intermediate images for calculating the gradients to the given image.

Parameters
grayThe original grayscale image we want analyze
Examples:
SampleIntegralImage.cpp.

Definition at line 176 of file IntegralImage.cpp.

Member Data Documentation

IntegralImage alvar::IntegralGradient::integx
protected

Definition at line 140 of file IntegralImage.h.

IntegralImage alvar::IntegralGradient::integy
protected

Definition at line 141 of file IntegralImage.h.

IplImage* alvar::IntegralGradient::normalx
protected

Definition at line 138 of file IntegralImage.h.

IplImage* alvar::IntegralGradient::normaly
protected

Definition at line 139 of file IntegralImage.h.


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


ar_track_alvar
Author(s): Scott Niekum
autogenerated on Thu Jun 6 2019 19:27:24