at.mug.iqm.commons.util.image

Class IntegralImage

java.lang.Object

at.mug.iqm.commons.util.image.IntegralImage

public class IntegralImage
extends Object

This class represents the integral image (summed area table) of an image.

Reference: P. Viola, M. Jones. Rapid Object Detection Using A Boosted Cascade Of Simple Features. In Proc. CVPR. 2001.

Since:

3.1

Author:

Philipp Kainz

Field Summary

Fields

Modifier and Type	Field and Description
private int	height Original image height.
private double[][]	integralImage The container of the integral values
private int	width Original image width.

Constructor Summary

Constructors

Constructor and Description
IntegralImage(BufferedImage img) Construct a new integral image.

Method Summary

Modifier and Type	Method and Description
double	getArea(int x1, int y1, int x2, int y2) Returns the area spanned by two points.
double	getArea(Point p1, Point p2) Returns the area spanned by two points.
BufferedImage	getAsImage() Returns the integral image as normalized 8-bit grey value image.
double	getValue(int x, int y) Returns the value at position x,y of the integral image.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

integralImage

private double[][] integralImage

The container of the integral values

width

private int width

Original image width.

height

private int height

Original image height.

Constructor Detail

IntegralImage

public IntegralImage(BufferedImage img)

Construct a new integral image.

Parameters:

img - the image to create the integral image from

Method Detail

getValue

public double getValue(int x,
                       int y)

Returns the value at position x,y of the integral image.

Parameters:

x - x coordinate

y - y coordinate

Returns:

getArea

public double getArea(Point p1,
                      Point p2)

Returns the area spanned by two points.

Parameters:

p1 - top left corner of the rectangular area

p2 - bottom right corner of the rectangular area

Returns:

getArea

public double getArea(int x1,
                      int y1,
                      int x2,
                      int y2)

Returns the area spanned by two points.

Parameters:

x1 -

y1 -

x2 -

y2 -

Returns:

getAsImage

public BufferedImage getAsImage()

Returns the integral image as normalized 8-bit grey value image.

Returns: