org.opencv.features2d

Class KeyPoint

java.lang.Object

org.opencv.features2d.KeyPoint

public class KeyPoint
extends java.lang.Object

Data structure for salient point detectors.

coordinates of the keypoint

diameter of the meaningful keypoint neighborhood

// C++ code:

computed orientation of the keypoint (-1 if not applicable). Its possible values are in a range [0,360) degrees. It is measured relative to image coordinate system (y-axis is directed downward), ie in clockwise.

the response by which the most strong keypoints have been selected. Can be used for further sorting or subsampling

octave (pyramid layer) from which the keypoint has been extracted

object id that can be used to clustered keypoints by an object they belong to

See Also:

org.opencv.features2d.KeyPoint

Field Summary

Fields

Modifier and Type	Field and Description
float	angle Computed orientation of the keypoint (-1 if not applicable).
int	class_id Object ID, that can be used to cluster keypoints by an object they belong to.
int	octave Octave (pyramid layer), from which the keypoint has been extracted.
Point	pt Coordinates of the keypoint.
float	response The response, by which the strongest keypoints have been selected.
float	size Diameter of the useful keypoint adjacent area.

Constructor Summary

Constructors

Constructor and Description
KeyPoint() The keypoint constructors
KeyPoint(float x, float y, float _size) The keypoint constructors
KeyPoint(float x, float y, float _size, float _angle) The keypoint constructors
KeyPoint(float x, float y, float _size, float _angle, float _response) The keypoint constructors
KeyPoint(float x, float y, float _size, float _angle, float _response, int _octave) The keypoint constructors
KeyPoint(float x, float y, float _size, float _angle, float _response, int _octave, int _class_id) The keypoint constructors

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

angle

public float angle

Computed orientation of the keypoint (-1 if not applicable).

class_id

public int class_id

Object ID, that can be used to cluster keypoints by an object they belong to.

octave

public int octave

Octave (pyramid layer), from which the keypoint has been extracted.

pt

public Point pt

Coordinates of the keypoint.

response

public float response

The response, by which the strongest keypoints have been selected. Can be used for further sorting or subsampling.

size

public float size

Diameter of the useful keypoint adjacent area.

Constructor Detail

KeyPoint

public KeyPoint()

The keypoint constructors

See Also:

org.opencv.features2d.KeyPoint.KeyPoint

KeyPoint

public KeyPoint(float x,
        float y,
        float _size)

The keypoint constructors

Parameters:

x - x-coordinate of the keypoint

y - y-coordinate of the keypoint

_size - keypoint diameter

See Also:

org.opencv.features2d.KeyPoint.KeyPoint

KeyPoint

public KeyPoint(float x,
        float y,
        float _size,
        float _angle)

The keypoint constructors

Parameters:

x - x-coordinate of the keypoint

y - y-coordinate of the keypoint

_size - keypoint diameter

_angle - keypoint orientation

See Also:

org.opencv.features2d.KeyPoint.KeyPoint

KeyPoint

public KeyPoint(float x,
        float y,
        float _size,
        float _angle,
        float _response)

The keypoint constructors

Parameters:

x - x-coordinate of the keypoint

y - y-coordinate of the keypoint

_size - keypoint diameter

_angle - keypoint orientation

_response - keypoint detector response on the keypoint (that is, strength of the keypoint)

See Also:

org.opencv.features2d.KeyPoint.KeyPoint

KeyPoint

public KeyPoint(float x,
        float y,
        float _size,
        float _angle,
        float _response,
        int _octave)

The keypoint constructors

Parameters:

x - x-coordinate of the keypoint

y - y-coordinate of the keypoint

_size - keypoint diameter

_angle - keypoint orientation

_response - keypoint detector response on the keypoint (that is, strength of the keypoint)

_octave - pyramid octave in which the keypoint has been detected

See Also:

org.opencv.features2d.KeyPoint.KeyPoint

KeyPoint

public KeyPoint(float x,
        float y,
        float _size,
        float _angle,
        float _response,
        int _octave,
        int _class_id)

The keypoint constructors

Parameters:

x - x-coordinate of the keypoint

y - y-coordinate of the keypoint

_size - keypoint diameter

_angle - keypoint orientation

_response - keypoint detector response on the keypoint (that is, strength of the keypoint)

_octave - pyramid octave in which the keypoint has been detected

_class_id - object id

See Also:

org.opencv.features2d.KeyPoint.KeyPoint

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object