surf
Class My_Integral_Image

java.lang.Object
  surf.My_Integral_Image

All Implemented Interfaces:

Integral_Image

public class My_Integral_Image
extends java.lang.Object
implements Integral_Image

A standard implementation of the Integral_Image interface. Creates the integral image representation of supplied input image. Calculates pixel sums over upright rectangular areas.

Author:

Alessandro Martini, Claudio Fantacci

Constructor Summary

My_Integral_Image(processing.core.PImage img, processing.core.PApplet parent)
Constructor of My_Integral_Image.

Method Summary

float	getIntegralSquare(int xA, int yA, int xD, int yD) The method needs only A and D, i.e. the upper left and bottom right vertex coordinates.
float	getIntegralValue(int x, int y) Given the coordinates of a point of the image, returns its integral value, ie the intensity of the rectangle whose vertices are the origin and (x, y).

Methods inherited from class java.lang.Object

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

Constructor Detail

My_Integral_Image

public My_Integral_Image(processing.core.PImage img,
                         processing.core.PApplet parent)

Constructor of My_Integral_Image. The constructor receives the image and makes the conversion in its integral version. You allocate a matrix of integralValues of the same dimension of the given image. The Integral Image is full calculated as follows:

• At the first line, the direct sum of intensity (brightness) of pixels in each point represents the right value of the integral;
• For each next line, the correct value is given by the sum of the current row and of the cell in the matrix of the same coordinates of the pixel immediately above the pixel being processed.

Method Detail

getIntegralValue

public float getIntegralValue(int x,
                              int y)

Description copied from interface: Integral_Image

Given the coordinates of a point of the image, returns its integral value, ie the intensity of the rectangle whose vertices are the origin and (x, y).

Specified by:

getIntegralValue in interface Integral_Image

Parameters:

x - x-coordinate

y - y-coordinate

Returns:

The integral value of the given point.

getIntegralSquare

public float getIntegralSquare(int xA,
                               int yA,
                               int xD,
                               int yD)

Description copied from interface: Integral_Image

The method needs only A and D, i.e. the upper left and bottom right vertex coordinates.

Specified by:

getIntegralSquare in interface Integral_Image

Parameters:

xA - x-coordinate of vertex A.

yA - y-coordinate of vertex A.

xD - x-coordinate of vertex D.

yD - y-coordinate of vertex D.

Returns:

The integral value of the square.