org.openimaj.image.analysis.algorithm

Class SummedSqTiltAreaTable

java.lang.Object

org.openimaj.image.analysis.algorithm.SummedSqAreaTable

org.openimaj.image.analysis.algorithm.SummedSqTiltAreaTable

All Implemented Interfaces:

ImageAnalyser<FImage>

public class SummedSqTiltAreaTable
extends SummedSqAreaTable

Implementation of an Integral Image or Summed Area Table. This Implementation calculates both the sum, squared sum values, and (optionally) 45-degree tilted sum values.

See http://en.wikipedia.org/wiki/Summed_area_table and http://research.microsoft .com/en-us/um/people/viola/Pubs/Detect/violaJones_IJCV.pdf

Basically, this provides an efficient way to find the sum of all pixels in a rectangular area of an image.

Author:

Jonathon Hare (jsh2@ecs.soton.ac.uk)

Field Summary

Fields

Modifier and Type	Field and Description
FImage	tiltSum The tilted sum data

Fields inherited from class org.openimaj.image.analysis.algorithm.SummedSqAreaTable

sqSum, sum

Constructor Summary

Constructors

Constructor and Description
SummedSqTiltAreaTable() Construct an empty SAT.
SummedSqTiltAreaTable(FImage image) Construct a SAT for normal sum, squared sum and tilted sum from the provided image.
SummedSqTiltAreaTable(FImage image, boolean computeTilted) Construct a SAT for normal sum, squared sum and (optionally) tilted sum from the provided image.

Method Summary

Modifier and Type	Method and Description
void	analyseImage(FImage image) Analyse an image.
float	calculateTiltedSumArea(int x, int y, int width, int height) Calculate the sum of pixels in the image used for constructing this SAT within the 45 degree tilted rectangle.
float	calculateTiltedSumArea(Rectangle r) Calculate the sum pixels in the image used for constructing this SAT within the given 45-degree tilted rectangle.
protected void	computeRotSqSumIntegralImages(FImage image)
protected void	computeSqSumIntegralImages(FImage img)

Methods inherited from class org.openimaj.image.analysis.algorithm.SummedSqAreaTable

calculateSqSumArea, calculateSqSumArea, calculateSumArea, calculateSumArea, computeTable

Methods inherited from class java.lang.Object

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

Field Detail

tiltSum

public FImage tiltSum

The tilted sum data

Constructor Detail

SummedSqTiltAreaTable

public SummedSqTiltAreaTable()

Construct an empty SAT.

SummedSqTiltAreaTable

public SummedSqTiltAreaTable(FImage image)

Construct a SAT for normal sum, squared sum and tilted sum from the provided image.

Parameters:

image - the image.

SummedSqTiltAreaTable

public SummedSqTiltAreaTable(FImage image,
                             boolean computeTilted)

Construct a SAT for normal sum, squared sum and (optionally) tilted sum from the provided image.

Parameters:

image - the image.

computeTilted - if true compute the tilted features.

Method Detail

computeSqSumIntegralImages

protected void computeSqSumIntegralImages(FImage img)

computeRotSqSumIntegralImages

protected final void computeRotSqSumIntegralImages(FImage image)

calculateTiltedSumArea

public float calculateTiltedSumArea(int x,
                                    int y,
                                    int width,
                                    int height)

Calculate the sum of pixels in the image used for constructing this SAT within the 45 degree tilted rectangle.

Parameters:

x -

y -

width -

height -

Returns:

sum of pixels in given rectangle

calculateTiltedSumArea

public float calculateTiltedSumArea(Rectangle r)

Calculate the sum pixels in the image used for constructing this SAT within the given 45-degree tilted rectangle.

Parameters:

r - rectangle

Returns:

sum of pixels in given rectangle

analyseImage

public void analyseImage(FImage image)

Description copied from interface: ImageAnalyser

Analyse an image.

Specified by:

analyseImage in interface ImageAnalyser<FImage>

Overrides:

analyseImage in class SummedSqAreaTable

Parameters:

image - The image to process in place.