Package org.opencv.xfeatures2d

Class FREAK

java.lang.Object

org.opencv.core.Algorithm

org.opencv.features.Feature2D

org.opencv.xfeatures2d.FREAK

public class FREAK
extends Feature2D

Class implementing the FREAK (*Fast Retina Keypoint*) keypoint descriptor, described in CITE: AOV12 . The algorithm propose a novel keypoint descriptor inspired by the human visual system and more precisely the retina, coined Fast Retina Key- point (FREAK). A cascade of binary strings is computed by efficiently comparing image intensities over a retinal sampling pattern. FREAKs are in general faster to compute with lower memory load and also more robust than SIFT, SURF or BRISK. They are competitive alternatives to existing keypoints in particular for embedded applications. Note:

• An example on how to use the FREAK descriptor can be found at opencv_source_code/samples/cpp/freak_demo.cpp

Field Summary

Fields inherited from class org.opencv.core.Algorithm

nativeObj

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FREAK(long addr)

Method Summary

Modifier and Type	Method	Description
static FREAK	__fromPtr__(long addr)
static FREAK	create()
static FREAK	create(boolean orientationNormalized)
static FREAK	create(boolean orientationNormalized, boolean scaleNormalized)
static FREAK	create(boolean orientationNormalized, boolean scaleNormalized, float patternScale)
static FREAK	create(boolean orientationNormalized, boolean scaleNormalized, float patternScale, int nOctaves)
static FREAK	create(boolean orientationNormalized, boolean scaleNormalized, float patternScale, int nOctaves, MatOfInt selectedPairs)
protected void	finalize()
java.lang.String	getDefaultName()	Returns the algorithm string identifier.
int	getNOctaves()
boolean	getOrientationNormalized()
double	getPatternScale()
boolean	getScaleNormalized()
void	setNOctaves(int nOctaves)
void	setOrientationNormalized(boolean orientationNormalized)
void	setPatternScale(double patternScale)
void	setScaleNormalized(boolean scaleNormalized)

Methods inherited from class org.opencv.features.Feature2D

compute, compute, defaultNorm, descriptorSize, descriptorType, detect, detect, detect, detect, detectAndCompute, detectAndCompute, empty, read, write

Methods inherited from class org.opencv.core.Algorithm

clear, getNativeObjAddr, save

Methods inherited from class java.lang.Object

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

Constructor Detail

FREAK

protected FREAK(long addr)

Method Detail

__fromPtr__

public static FREAK __fromPtr__(long addr)

create

public static FREAK create(boolean orientationNormalized,
                           boolean scaleNormalized,
                           float patternScale,
                           int nOctaves,
                           MatOfInt selectedPairs)

Parameters:

orientationNormalized - Enable orientation normalization.

scaleNormalized - Enable scale normalization.

patternScale - Scaling of the description pattern.

nOctaves - Number of octaves covered by the detected keypoints.

selectedPairs - (Optional) user defined selected pairs indexes,

Returns:

automatically generated

create

public static FREAK create(boolean orientationNormalized,
                           boolean scaleNormalized,
                           float patternScale,
                           int nOctaves)

Parameters:

orientationNormalized - Enable orientation normalization.

scaleNormalized - Enable scale normalization.

patternScale - Scaling of the description pattern.

nOctaves - Number of octaves covered by the detected keypoints.

Returns:

automatically generated

create

public static FREAK create(boolean orientationNormalized,
                           boolean scaleNormalized,
                           float patternScale)

Parameters:

orientationNormalized - Enable orientation normalization.

scaleNormalized - Enable scale normalization.

patternScale - Scaling of the description pattern.

Returns:

automatically generated

create

public static FREAK create(boolean orientationNormalized,
                           boolean scaleNormalized)

Parameters:

orientationNormalized - Enable orientation normalization.

scaleNormalized - Enable scale normalization.

Returns:

automatically generated

create

public static FREAK create(boolean orientationNormalized)

Parameters:

orientationNormalized - Enable orientation normalization.

Returns:

automatically generated

create

public static FREAK create()

Returns:

automatically generated

setOrientationNormalized

public void setOrientationNormalized(boolean orientationNormalized)

getOrientationNormalized

public boolean getOrientationNormalized()

setScaleNormalized

public void setScaleNormalized(boolean scaleNormalized)

getScaleNormalized

public boolean getScaleNormalized()

setPatternScale

public void setPatternScale(double patternScale)

getPatternScale

public double getPatternScale()

setNOctaves

public void setNOctaves(int nOctaves)

getNOctaves

public int getNOctaves()

getDefaultName

public java.lang.String getDefaultName()

Description copied from class: Algorithm

Returns the algorithm string identifier. This string is used as top level xml/yml node tag when the object is saved to a file or string.

Overrides:

getDefaultName in class Feature2D

Returns:

automatically generated

finalize

protected void finalize()
                 throws java.lang.Throwable

Overrides:

finalize in class Feature2D

Throws:

java.lang.Throwable