org.opencv.xfeatures2d

Class FREAK

java.lang.Object

org.opencv.core.Algorithm

org.opencv.features2d.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

Modifier and Type	Field and Description
static int	NB_ORIENPAIRS
static int	NB_PAIRS
static int	NB_SCALES

Fields inherited from class org.opencv.core.Algorithm

nativeObj

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FREAK(long addr)

Method Summary

Modifier and Type	Method and 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()

Methods inherited from class org.opencv.features2d.Feature2D

compute, compute, defaultNorm, descriptorSize, descriptorType, detect, detect, detect, detect, detectAndCompute, detectAndCompute, empty, getDefaultName, 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

Field Detail

NB_SCALES

public static final int NB_SCALES

See Also:

Constant Field Values

NB_PAIRS

public static final int NB_PAIRS

See Also:

Constant Field Values

NB_ORIENPAIRS

public static final int NB_ORIENPAIRS

See Also:

Constant Field Values

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

finalize

protected void finalize()
                 throws Throwable

Overrides:

finalize in class Feature2D

Throws:

Throwable