boofcv.alg.feature.detect.intensity.impl

Class ImplSsdCornerBase<D extends ImageSingleBand,D2 extends ImageSingleBand>

java.lang.Object

boofcv.alg.feature.detect.intensity.impl.ImplSsdCornerBase<D,D2>

All Implemented Interfaces:

FeatureIntensity<D>, GradientCornerIntensity<D>

Direct Known Subclasses:

ImplSsdCorner_F32, ImplSsdCorner_S16

public abstract class ImplSsdCornerBase<D extends ImageSingleBand,D2 extends ImageSingleBand>
extends Object
implements GradientCornerIntensity<D>

Several corner detector algorithms work by computing a symmetric matrix whose elements are composed of the convolution of the image's gradient squared. This is done for X*X, X*Y, and X*X. Once the matrix has been constructed it is used to estimate how corner like the pixel under consideration is. This class provides a generalized interface for performing these calculations in an optimized manor.

NOTE: Image borders are not processed. The zeros in the image border need to be taken in account when extract features using algorithms such as non-max suppression.

Author:

Peter Abeles

Field Summary

Fields

Modifier and Type	Field and Description
protected D	derivX
protected D	derivY
protected D2	horizXX
protected D2	horizXY
protected D2	horizYY
protected int	radius
protected int	x
protected int	y

Constructor Summary

Constructors

Constructor and Description
ImplSsdCornerBase(int windowRadius, Class<D2> secondDerivType)

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract float	computeIntensity() Computes the pixel's corner intensity.
int	getIgnoreBorder() Size of the region surrounding the image's border in which pixels are not processed.
int	getRadius() Returns the radius of the feature being computed.
protected abstract void	horizontal()
void	process(D derivX, D derivY, ImageFloat32 intensity) Computes feature intensity image.
void	setImageShape(int imageWidth, int imageHeight)
protected abstract void	vertical(ImageFloat32 intensity)

Methods inherited from class java.lang.Object

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

Field Detail

derivX

protected D extends ImageSingleBand derivX

derivY

protected D extends ImageSingleBand derivY

radius

protected int radius

horizXX

protected D2 extends ImageSingleBand horizXX

horizXY

protected D2 extends ImageSingleBand horizXY

horizYY

protected D2 extends ImageSingleBand horizYY

x

protected int x

y

protected int y

Constructor Detail

ImplSsdCornerBase

public ImplSsdCornerBase(int windowRadius,
                 Class<D2> secondDerivType)

Method Detail

setImageShape

public void setImageShape(int imageWidth,
                 int imageHeight)

getRadius

public int getRadius()

Description copied from interface: FeatureIntensity

Returns the radius of the feature being computed. Features are square in shape with a width = 2*radius+1.

Specified by:

getRadius in interface FeatureIntensity<D extends ImageSingleBand>

Returns:

Radius of detected features.

computeIntensity

protected abstract float computeIntensity()

Computes the pixel's corner intensity.

Returns:

corner intensity.

getIgnoreBorder

public int getIgnoreBorder()

Description copied from interface: FeatureIntensity

Size of the region surrounding the image's border in which pixels are not processed.

Specified by:

getIgnoreBorder in interface FeatureIntensity<D extends ImageSingleBand>

Returns:

The ignore border around the image.

process

public void process(D derivX,
           D derivY,
           ImageFloat32 intensity)

Description copied from interface: GradientCornerIntensity

Computes feature intensity image.

Specified by:

process in interface GradientCornerIntensity<D extends ImageSingleBand>

Parameters:

derivX - Image derivative along the x-axis.

derivY - Image derivative along the y-axis.

intensity - Output intensity image

horizontal

protected abstract void horizontal()

vertical

protected abstract void vertical(ImageFloat32 intensity)