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firevision::HtLinesModel Class Reference

Hough-Transform line matcher. More...

#include <>>

Inheritance diagram for firevision::HtLinesModel:

List of all members.

Public Member Functions

 HtLinesModel (unsigned int nr_candidates=40, float angle_from=0, float angle_range=2 *M_PI, int r_scale=1, float min_votes_ratio=0.2f, int min_votes=-1)
 Creates a new HtLinesModel instance.
virtual ~HtLinesModel (void)
 Destructor.
std::string getName (void) const
 Get name of shape model.
int parseImage (unsigned char *buffer, ROI *roi)
 Parse image for given ROI.
int getShapeCount (void) const
 Get number of shapes.
LineShapegetShape (int id) const
 Get specific shape.
LineShapegetMostLikelyShape (void) const
 Get best candidate.
std::vector< LineShape > * getShapes ()
 Get all lines found.
- Public Member Functions inherited from firevision::ShapeModel
virtual ~ShapeModel ()
 Virtual empty destructor.

Detailed Description

Hough-Transform line matcher.

Definition at line 43 of file ht_lines.h.


Constructor & Destructor Documentation

firevision::HtLinesModel::HtLinesModel ( unsigned int  nr_candidates = 40,
float  angle_from = 0,
float  angle_range = 2 * M_PI,
int  r_scale = 1,
float  min_votes_ratio = 0.2f,
int  min_votes = -1 
)

Creates a new HtLinesModel instance.

Constructor.

Parameters:
nr_candidatesthe nr of candidates that is considered per pixel (the hole angle range is devided in this many parts/lines
angle_fromThe angle to start the candidates from, given in rad, 0 is straight up
angle_rangethe angle range the candidates are taken from starting at angle_from, given in rad, can be used for example to only search for horizontal lines
r_scaleThis can be done to reduce the size of the hough space and to map more lines to one line
min_votes_ratioThe minimum ratio num_votes_per_line/total_num_votes that we have to have before a point in the hough space is considered to be a line, this may actually be higher if you use min_votes and set it to a higher number (set min_votes to 0 to only use min_votes_ration)
min_votesthe minimum number of votes a point in the hough space has to have before it is considered to be a line. The number may actually be higher if min_votes_ratio is set too high (set min_votes_ration to 0 to use only min_votes)
nr_candidatesnumber of candidates
angle_fromslope of lines from
angle_rangeangle range
r_scaler scale
min_votes_ratiomin votes ratio
min_votesminimum number of votes for a candidate to consider

Definition at line 53 of file ht_lines.cpp.

firevision::HtLinesModel::~HtLinesModel ( void  )
virtual

Destructor.

Definition at line 69 of file ht_lines.cpp.


Member Function Documentation

LineShape * firevision::HtLinesModel::getMostLikelyShape ( void  ) const
virtual

Get best candidate.

Returns:
best candidate shape, do not free.

Implements firevision::ShapeModel.

Definition at line 167 of file ht_lines.cpp.

std::string firevision::HtLinesModel::getName ( void  ) const
inlinevirtual

Get name of shape model.

Returns:
name of shape model.

Implements firevision::ShapeModel.

Definition at line 69 of file ht_lines.h.

LineShape * firevision::HtLinesModel::getShape ( int  id) const
virtual

Get specific shape.

Parameters:
idshape ID
Returns:
shape, do NOT free!

Implements firevision::ShapeModel.

Definition at line 156 of file ht_lines.cpp.

int firevision::HtLinesModel::getShapeCount ( void  ) const
virtual

Get number of shapes.

Returns:
number of shapes.

Implements firevision::ShapeModel.

Definition at line 150 of file ht_lines.cpp.

vector< LineShape > * firevision::HtLinesModel::getShapes ( )

Get all lines found.

Returns:
vector with all line shapes.

Definition at line 189 of file ht_lines.cpp.

References firevision::LineShape::calcPoints().

int firevision::HtLinesModel::parseImage ( unsigned char *  buffer,
ROI roi 
)
virtual

Parse image for given ROI.

Parameters:
bufferimage buffer
roiROI
Returns:
number of shapes found

Implements firevision::ShapeModel.

Definition at line 75 of file ht_lines.cpp.

References firevision::ROI::get_roi_buffer_start(), firevision::ROI::height, firevision::ROI::line_step, fawkes::rad2deg(), firevision::ROI::width, fawkes::point_t::x, and fawkes::point_t::y.


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