org.bytedeco.opencv.opencv_xfeatures2d

Class BEBLID

java.lang.Object

org.bytedeco.javacpp.Pointer

org.bytedeco.opencv.opencv_core.Algorithm

org.bytedeco.opencv.opencv_features2d.Feature2D

org.bytedeco.opencv.opencv_xfeatures2d.BEBLID

All Implemented Interfaces:

AutoCloseable

@Namespace(value="cv::xfeatures2d")
 @Properties(inherit=opencv_xfeatures2d.class)
public class BEBLID
extends Feature2D

\brief Class implementing BEBLID (Boosted Efficient Binary Local Image Descriptor), described in \cite Suarez2020BEBLID .

BEBLID \cite Suarez2020BEBLID is a efficient binary descriptor learned with boosting. It is able to describe keypoints from any detector just by changing the scale_factor parameter. In several benchmarks it has proved to largely improve other binary descriptors like ORB or BRISK with the same efficiency. BEBLID describes using the difference of mean gray values in different regions of the image around the KeyPoint, the descriptor is specifically optimized for image matching and patch retrieval addressing the asymmetries of these problems.

If you find this code useful, please add a reference to the following paper:

Iago Suárez, Ghesn Sfeir, José M. Buenaposada, and Luis Baumela. BEBLID: Boosted efficient binary local image descriptor. Pattern Recognition Letters, 133:366–372, 2020.

The descriptor was trained using 1 million of randomly sampled pairs of patches (20% positives and 80% negatives) from the Liberty split of the UBC datasets \cite winder2007learning as described in the paper \cite Suarez2020BEBLID. You can check in the [AKAZE example](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/features2D/AKAZE_match.cpp) how well BEBLID works. Detecting 10000 keypoints with ORB and describing with BEBLID obtains 561 inliers (75%) whereas describing with ORB obtains only 493 inliers (63%).

Nested Class Summary

Nested classes/interfaces inherited from class org.bytedeco.javacpp.Pointer

Pointer.CustomDeallocator, Pointer.Deallocator, Pointer.NativeDeallocator, Pointer.ReferenceCounter

Field Summary

Fields

Modifier and Type	Field and Description
static int	SIZE_256_BITS enum cv::xfeatures2d::BEBLID::BeblidSize
static int	SIZE_512_BITS enum cv::xfeatures2d::BEBLID::BeblidSize

Fields inherited from class org.bytedeco.javacpp.Pointer

address, capacity, limit, position

Constructor Summary

Constructors

Constructor and Description
BEBLID() Default native constructor.
BEBLID(long size) Native array allocator.
BEBLID(Pointer p) Pointer cast constructor.

Method Summary

Modifier and Type	Method and Description
static BEBLID	create(float scale_factor)
static BEBLID	create(float scale_factor, int n_bits) \brief Creates the BEBLID descriptor.
BEBLID	getPointer(long i)
BEBLID	position(long position)

Methods inherited from class org.bytedeco.opencv.opencv_features2d.Feature2D

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

Methods inherited from class org.bytedeco.opencv.opencv_core.Algorithm

clear, save, save

Methods inherited from class org.bytedeco.javacpp.Pointer

address, asBuffer, asByteBuffer, availablePhysicalBytes, calloc, capacity, capacity, close, deallocate, deallocate, deallocateReferences, deallocator, deallocator, equals, fill, formatBytes, free, getPointer, getPointer, getPointer, hashCode, interruptDeallocatorThread, isNull, isNull, limit, limit, malloc, maxBytes, maxPhysicalBytes, memchr, memcmp, memcpy, memmove, memset, offsetAddress, offsetof, offsetof, parseBytes, physicalBytes, physicalBytesInaccurate, position, put, realloc, referenceCount, releaseReference, retainReference, setNull, sizeof, sizeof, toString, totalBytes, totalCount, totalPhysicalBytes, withDeallocator, zero

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

SIZE_512_BITS

public static final int SIZE_512_BITS

enum cv::xfeatures2d::BEBLID::BeblidSize

See Also:

Constant Field Values

SIZE_256_BITS

public static final int SIZE_256_BITS

enum cv::xfeatures2d::BEBLID::BeblidSize

See Also:

Constant Field Values

Constructor Detail

BEBLID

public BEBLID()

Default native constructor.

BEBLID

public BEBLID(long size)

Native array allocator. Access with Pointer.position(long).

BEBLID

public BEBLID(Pointer p)

Pointer cast constructor. Invokes Pointer(Pointer).

Method Detail

position

public BEBLID position(long position)

Overrides:

position in class Feature2D

getPointer

public BEBLID getPointer(long i)

Overrides:

getPointer in class Feature2D

create

@opencv_core.Ptr
public static BEBLID create(float scale_factor,
                                             int n_bits)

\brief Creates the BEBLID descriptor.

Parameters:

scale_factor - Adjust the sampling window around detected keypoints: - 1.00f should be the scale for ORB keypoints - 6.75f should be the scale for SIFT detected keypoints - 6.25f is default and fits for KAZE, SURF detected keypoints - 5.00f should be the scale for AKAZE, MSD, AGAST, FAST, BRISK keypoints

n_bits - Determine the number of bits in the descriptor. Should be either BEBLID::SIZE_512_BITS or BEBLID::SIZE_256_BITS.

create

@opencv_core.Ptr
public static BEBLID create(float scale_factor)