OpenCV
3.3.1
Open Source Computer Vision
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Abstract base class for 2D image feature detectors and descriptor extractors. More...
#include "features2d.hpp"
Public Member Functions | |
virtual | ~Feature2D () |
virtual void | compute (InputArray image, std::vector< KeyPoint > &keypoints, OutputArray descriptors) |
Computes the descriptors for a set of keypoints detected in an image (first variant) or image set (second variant). More... | |
virtual void | compute (InputArrayOfArrays images, std::vector< std::vector< KeyPoint > > &keypoints, OutputArrayOfArrays descriptors) |
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... | |
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 |
Additional Inherited Members | |
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... | |
Protected Member Functions inherited from cv::Algorithm | |
void | writeFormat (FileStorage &fs) const |
Abstract base class for 2D image feature detectors and descriptor extractors.
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Computes the descriptors for a set of keypoints detected in an image (first variant) or image set (second variant).
image | Image. |
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 in cv::xfeatures2d::VGG, and cv::xfeatures2d::DAISY.
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This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
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 in cv::xfeatures2d::DAISY.
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Detects keypoints in an image (first variant) or image set (second variant).
image | Image. |
keypoints | The detected keypoints. In the second variant of the method keypoints[i] is a set of keypoints detected in images[i] . |
mask | Mask specifying where to look for keypoints (optional). It must be a 8-bit integer matrix with non-zero values in the region of interest. |
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This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
images | Image set. |
keypoints | The detected keypoints. In the second variant of the method keypoints[i] is a set of keypoints detected in images[i] . |
masks | Masks for each input image specifying where to look for keypoints (optional). masks[i] is a mask for images[i]. |
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Detects keypoints and computes the descriptors
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Return true if detector object is empty.
Reimplemented from cv::Algorithm.
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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.
Reimplemented from cv::Algorithm.
Reimplemented in cv::AKAZE, cv::KAZE, cv::SimpleBlobDetector, cv::GFTTDetector, cv::AgastFeatureDetector, cv::FastFeatureDetector, cv::MSER, cv::ORB, and cv::BRISK.
void cv::Feature2D::read | ( | const String & | fileName | ) |
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Reads algorithm parameters from a file storage.
Reimplemented from cv::Algorithm.
void cv::Feature2D::write | ( | const String & | fileName | ) | const |
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Stores algorithm parameters in a file storage.
Reimplemented from cv::Algorithm.