| OpenCV 3.4.1 Open Source Computer Vision

Public Types | Public Member Functions | Static Public Member Functions | List of all members
cv::xfeatures2d::DAISY Class Referenceabstract
Extra 2D Features Framework » Experimental 2D Features Algorithms

Class implementing DAISY descriptor, described in [179]. More...

`#include "xfeatures2d.hpp"`

Inheritance diagram for cv::xfeatures2d::DAISY:

## Public Types
enum | { NRM_NONE = 100, NRM_PARTIAL = 101, NRM_FULL = 102, NRM_SIFT = 103 }

## Public Member Functions
virtual void | compute (InputArray image, std::vector< KeyPoint > &keypoints, OutputArray descriptors)=0
virtual void | compute (InputArrayOfArrays images, std::vector< std::vector< KeyPoint > > &keypoints, OutputArrayOfArrays descriptors)
virtual void | compute (InputArray image, Rect roi, OutputArray descriptors)=0
virtual void | compute (InputArray image, OutputArray descriptors)=0
virtual void | GetDescriptor (double y, double x, int orientation, float *descriptor) const =0
virtual bool | GetDescriptor (double y, double x, int orientation, float *descriptor, double *H) const =0
virtual void | GetUnnormalizedDescriptor (double y, double x, int orientation, float *descriptor) const =0
virtual bool | GetUnnormalizedDescriptor (double y, double x, int orientation, float *descriptor, double *H) const =0
Public Member Functions inherited from cv::Feature2D
virtual | ~Feature2D ()
virtual int | defaultNorm () const
virtual int | descriptorSize () const
virtual int | descriptorType () const
virtual void | detect (InputArray image, std::vector< KeyPoint > &keypoints, InputArray mask=noArray())
| Detects keypoints in an image (first variant) or image set (second variant). More...
virtual void | detect (InputArrayOfArrays images, std::vector< std::vector< KeyPoint > > &keypoints, InputArrayOfArrays masks=noArray())
virtual void | detectAndCompute (InputArray image, InputArray mask, std::vector< KeyPoint > &keypoints, OutputArray descriptors, bool useProvidedKeypoints=false)
virtual bool | empty () const
| Return true if detector object is empty. More...
virtual String | getDefaultName () const
void | read (const String &fileName)
virtual void | read (const FileNode &)
| Reads algorithm parameters from a file storage. More...
void | write (const String &fileName) const
virtual void | write (FileStorage &) const
| Stores algorithm parameters in a file storage. More...
void | write (const Ptr< FileStorage > &fs, const String &name=String()) const
Public Member Functions inherited from cv::Algorithm
| Algorithm ()
virtual | ~Algorithm ()
virtual void | clear ()
| Clears the algorithm state. More...
virtual void | save (const String &filename) const
void | write (const Ptr< FileStorage > &fs, const String &name=String()) const
| simplified API for language bindings This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...

## Static Public Member Functions
static Ptr< DAISY > | create (float radius=15, int q_radius=3, int q_theta=8, int q_hist=8, int norm=DAISY::NRM_NONE, InputArray H=noArray(), bool interpolation=true, bool use_orientation=false)
Static Public Member Functions inherited from cv::Algorithm
template<typename _Tp >
static Ptr< _Tp > | load (const String &filename, const String &objname=String())
| Loads algorithm from the file. More...
template<typename _Tp >
static Ptr< _Tp > | loadFromString (const String &strModel, const String &objname=String())
| Loads algorithm from a String. More...
template<typename _Tp >
static Ptr< _Tp > | read (const FileNode &fn)
| Reads algorithm from the file node. More...

## Additional Inherited Members
Protected Member Functions inherited from cv::Algorithm
void | writeFormat (FileStorage &fs) const

## Detailed Description

Class implementing DAISY descriptor, described in [179].

Parameters

  radius | radius of the descriptor at the initial scale
  q_radius | amount of radial range division quantity
  q_theta | amount of angular range division quantity
  q_hist | amount of gradient orientations range division quantity
  norm | choose descriptors normalization type, where DAISY::NRM_NONE will not do any normalization (default), DAISY::NRM_PARTIAL mean that histograms are normalized independently for L2 norm equal to 1.0, DAISY::NRM_FULL mean that descriptors are normalized for L2 norm equal to 1.0, DAISY::NRM_SIFT mean that descriptors are normalized for L2 norm equal to 1.0 but no individual one is bigger than 0.154 as in SIFT
  H | optional 3x3 homography matrix used to warp the grid of daisy but sampling keypoints remains unwarped on image
  interpolation | switch to disable interpolation for speed improvement at minor quality loss
  use_orientation | sample patterns using keypoints orientation, disabled by default.

## Member Enumeration Documentation

## § anonymous enum

anonymous enum

Enumerator
NRM_NONE |
NRM_PARTIAL |
NRM_FULL |
NRM_SIFT |

## Member Function Documentation

## § compute() [1/4]

virtual void cv::xfeatures2d::DAISY::compute | ( | InputArray | image,
|  | std::vector< KeyPoint > & | keypoints,
|  | OutputArray | descriptors
| ) |  |
| pure virtual

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

  image | image to extract descriptors
  keypoints | of interest within image
  descriptors | resulted descriptors array

Reimplemented from cv::Feature2D.

## § compute() [2/4]

virtual void cv::xfeatures2d::DAISY::compute | ( | InputArrayOfArrays | images,
|  | std::vector< std::vector< KeyPoint > > & | keypoints,
|  | OutputArrayOfArrays | descriptors
| ) |  |
| virtual

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

  images | Image set.
  keypoints | Input collection of keypoints. Keypoints for which a descriptor cannot be computed are removed. Sometimes new keypoints can be added, for example: SIFT duplicates keypoint with several dominant orientations (for each orientation).
  descriptors | Computed descriptors. In the second variant of the method descriptors[i] are descriptors computed for a keypoints[i]. Row j is the keypoints (or keypoints[i]) is the descriptor for keypoint j-th keypoint.

Reimplemented from cv::Feature2D.

## § compute() [3/4]

virtual void cv::xfeatures2d::DAISY::compute | ( | InputArray | image,
|  | Rect | roi,
|  | OutputArray | descriptors
| ) |  |
| pure virtual

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

  image | image to extract descriptors
  roi | region of interest within image
  descriptors | resulted descriptors array for roi image pixels

## § compute() [4/4]

virtual void cv::xfeatures2d::DAISY::compute | ( | InputArray | image,
|  | OutputArray | descriptors
| ) |  |
| pure virtual

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

  image | image to extract descriptors
  descriptors | resulted descriptors array for all image pixels

## § create()

static Ptr<DAISY> cv::xfeatures2d::DAISY::create | ( | float | radius = `15`,
|  | int | q_radius = `3`,
|  | int | q_theta = `8`,
|  | int | q_hist = `8`,
|  | int | norm = `DAISY::NRM_NONE`,
|  | InputArray | H = `noArray()`,
|  | bool | interpolation = `true`,
|  | bool | use_orientation = `false`
| ) |  |
| static

Python:
| retval | = | cv.xfeatures2d.DAISY_create( | [, radius[, q_radius[, q_theta[, q_hist[, norm[, H[, interpolation[, use_orientation]]]]]]]] | )

## § GetDescriptor() [1/2]

virtual void cv::xfeatures2d::DAISY::GetDescriptor | ( | double | y,
|  | double | x,
|  | int | orientation,
|  | float * | descriptor
| ) |  | const
| pure virtual

Parameters

  y | position y on image
  x | position x on image
  orientation | orientation on image (0->360)
  descriptor | supplied array for descriptor storage

## § GetDescriptor() [2/2]

virtual bool cv::xfeatures2d::DAISY::GetDescriptor | ( | double | y,
|  | double | x,
|  | int | orientation,
|  | float * | descriptor,
|  | double * | H
| ) |  | const
| pure virtual

Parameters

  y | position y on image
  x | position x on image
  orientation | orientation on image (0->360)
  descriptor | supplied array for descriptor storage
  H | homography matrix for warped grid

## § GetUnnormalizedDescriptor() [1/2]

virtual void cv::xfeatures2d::DAISY::GetUnnormalizedDescriptor | ( | double | y,
|  | double | x,
|  | int | orientation,
|  | float * | descriptor
| ) |  | const
| pure virtual

Parameters

  y | position y on image
  x | position x on image
  orientation | orientation on image (0->360)
  descriptor | supplied array for descriptor storage

## § GetUnnormalizedDescriptor() [2/2]

virtual bool cv::xfeatures2d::DAISY::GetUnnormalizedDescriptor | ( | double | y,
|  | double | x,
|  | int | orientation,
|  | float * | descriptor,
|  | double * | H
| ) |  | const
| pure virtual

Parameters

  y | position y on image
  x | position x on image
  orientation | orientation on image (0->360)
  descriptor | supplied array for descriptor storage
  H | homography matrix for warped grid

The documentation for this class was generated from the following file:

- /build/master-contrib_docs-lin64/opencv_contrib/modules/xfeatures2d/include/opencv2/xfeatures2d.hpp