| OpenCV 3.4.8 Open Source Computer Vision

Public Member Functions | List of all members
cv::ximgproc::ContourFitting Class Reference
Extended Image Processing » Fourier descriptors

Class for ContourFitting algorithms. ContourFitting match two contours \( z_a \) and \( z_b \) minimizing distance

\[ d(z_a,z_b)=\sum (a_n - s b_n e^{j(n \alpha +\phi )})^2 \]

where \( a_n \) and \( b_n \) are Fourier descriptors of \( z_a \) and \( z_b \) and s is a scaling factor and \( \phi \) is angle rotation and \( \alpha \) is starting point factor adjustement. More...

`#include <opencv2/ximgproc/fourier_descriptors.hpp>`

Inheritance diagram for cv::ximgproc::ContourFitting:

## Public Member Functions
| ContourFitting (int ctr=1024, int fd=16)
| Fit two closed curves using fourier descriptors. More details in [167] and [16]. More...
void | estimateTransformation (InputArray src, InputArray dst, OutputArray alphaPhiST, double *dist=0, bool fdContour=false)
| Fit two closed curves using fourier descriptors. More details in [167] and [16]. More...
void | estimateTransformation (InputArray src, InputArray dst, OutputArray alphaPhiST, double &dist, bool fdContour=false)
| Fit two closed curves using fourier descriptors. More details in [167] and [16]. More...
int | getCtrSize ()
int | getFDSize ()
void | setCtrSize (int n)
| set number of Fourier descriptors used in estimateTransformation More...
void | setFDSize (int n)
| set number of Fourier descriptors when estimateTransformation used vector<Point> More...
Public Member Functions inherited from cv::Algorithm
| Algorithm ()
virtual | ~Algorithm ()
virtual void | clear ()
| Clears the algorithm state. More...
virtual bool | empty () const
| Returns true if the Algorithm is empty (e.g. in the very beginning or after unsuccessful read. More...
virtual String | getDefaultName () const
virtual void | read (const FileNode &fn)
| Reads algorithm parameters from a file storage. More...
virtual void | save (const String &filename) const
virtual void | write (FileStorage &fs) const
| Stores algorithm parameters in a file storage. More...
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...

## 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

## Detailed Description

Class for ContourFitting algorithms. ContourFitting match two contours \( z_a \) and \( z_b \) minimizing distance

\[ d(z_a,z_b)=\sum (a_n - s b_n e^{j(n \alpha +\phi )})^2 \]

where \( a_n \) and \( b_n \) are Fourier descriptors of \( z_a \) and \( z_b \) and s is a scaling factor and \( \phi \) is angle rotation and \( \alpha \) is starting point factor adjustement.

## Constructor & Destructor Documentation

## § ContourFitting()

cv::ximgproc::ContourFitting::ContourFitting | ( | int | ctr = `1024`,
|  | int | fd = `16`
| ) |  |
| inline

Fit two closed curves using fourier descriptors. More details in [167] and [16].

Parameters

  ctr | number of Fourier descriptors equal to number of contour points after resampling.
  fd | Contour defining second shape (Target).

## Member Function Documentation

## § estimateTransformation() [1/2]

void cv::ximgproc::ContourFitting::estimateTransformation | ( | InputArray | src,
|  | InputArray | dst,
|  | OutputArray | alphaPhiST,
|  | double * | dist = `0`,
|  | bool | fdContour = `false`
| ) |  |

Python:
| alphaPhiST, dist | = | cv.ximgproc_ContourFitting.estimateTransformation( | src, dst[, alphaPhiST[, fdContour]] | )

Fit two closed curves using fourier descriptors. More details in [167] and [16].

Parameters

  src | Contour defining first shape.
  dst | Contour defining second shape (Target).
  alphaPhiST | : \( \alpha \)=alphaPhiST(0,0), \( \phi \)=alphaPhiST(0,1) (in radian), s=alphaPhiST(0,2), Tx=alphaPhiST(0,3), Ty=alphaPhiST(0,4) rotation center
  dist | distance between src and dst after matching.
  fdContour | false then src and dst are contours and true src and dst are fourier descriptors.

## § estimateTransformation() [2/2]

void cv::ximgproc::ContourFitting::estimateTransformation | ( | InputArray | src,
|  | InputArray | dst,
|  | OutputArray | alphaPhiST,
|  | double & | dist,
|  | bool | fdContour = `false`
| ) |  |

Python:
| alphaPhiST, dist | = | cv.ximgproc_ContourFitting.estimateTransformation( | src, dst[, alphaPhiST[, fdContour]] | )

Fit two closed curves using fourier descriptors. More details in [167] and [16].

Parameters

  src | Contour defining first shape.
  dst | Contour defining second shape (Target).
  alphaPhiST | : \( \alpha \)=alphaPhiST(0,0), \( \phi \)=alphaPhiST(0,1) (in radian), s=alphaPhiST(0,2), Tx=alphaPhiST(0,3), Ty=alphaPhiST(0,4) rotation center
  dist | distance between src and dst after matching.
  fdContour | false then src and dst are contours and true src and dst are fourier descriptors.

## § getCtrSize()

int cv::ximgproc::ContourFitting::getCtrSize | ( |  | ) |
| inline

Python:
| retval | = | cv.ximgproc_ContourFitting.getCtrSize( |  | )

Returns
  number of fourier descriptors

## § getFDSize()

int cv::ximgproc::ContourFitting::getFDSize | ( |  | ) |
| inline

Python:
| retval | = | cv.ximgproc_ContourFitting.getFDSize( |  | )

Returns
  number of fourier descriptors used for optimal curve matching

## § setCtrSize()

void cv::ximgproc::ContourFitting::setCtrSize | ( | int | n | ) |

Python:
| None | = | cv.ximgproc_ContourFitting.setCtrSize( | n | )

set number of Fourier descriptors used in estimateTransformation

Parameters

  n | number of Fourier descriptors equal to number of contour points after resampling.

## § setFDSize()

void cv::ximgproc::ContourFitting::setFDSize | ( | int | n | ) |

Python:
| None | = | cv.ximgproc_ContourFitting.setFDSize( | n | )

set number of Fourier descriptors when estimateTransformation used vector<Point>

Parameters

  n | number of fourier descriptors used for optimal curve matching.

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

- opencv2/ximgproc/fourier_descriptors.hpp