Ocean::CV::Segmentation::ContourAnalyzer Class Reference

This class implements functions analyzing contours. More...

#include <ContourAnalyzer.h>

Data Structures
class	DenseObject
	This class implements a simple storage for a point index with corresponding dense parameter. More...

Public Types
typedef std::vector< unsigned int >	Indices
	Definition of a vector holding indices.

Static Public Member Functions
static Scalars	curvature (const PixelPositions &contour, const unsigned int offset)
	Determines the curvature for each contour pixel.
static PixelContour	createDenseContour (const PixelPositions &points)
	Creates a dense and distinct contour from any kind of given contour also ensuring that the resulting contour does not contain complex properties like loops.
static PixelContour	createDenseContour (const Vectors2 &points)
	Creates a dense and distinct contour from any kind of given contour also ensuring that the resulting contour does not contain complex properties like loops.
static Vectors2	equalizeContourDensity (const Vectors2 &contour)
	Equalized a sparse contour according to the density of the locations of contour points.

Protected Types
typedef std::vector< DenseObject >	DenseObjects
	Definition of a vector holding dense objects.

Static Private Member Functions
static size_t	pixelPositionHashValueFunction (const PixelPosition &position)
	Calculates a hash value for a given pixel position.
static PixelDirection	determinePixelDirection (const PixelPosition &pixel0, const PixelPosition &pixel1)
	Returns the pixel direction of two successive pixels in a dense contour.

Detailed Description

This class implements functions analyzing contours.

Member Typedef Documentation

DenseObjects

typedef std::vector<DenseObject> Ocean::CV::Segmentation::ContourAnalyzer::DenseObjects

protected

Definition of a vector holding dense objects.

Indices

typedef std::vector<unsigned int> Ocean::CV::Segmentation::ContourAnalyzer::Indices

Definition of a vector holding indices.

Member Function Documentation

createDenseContour() [1/2]

static PixelContour Ocean::CV::Segmentation::ContourAnalyzer::createDenseContour ( const PixelPositions &  points )

static

Creates a dense and distinct contour from any kind of given contour also ensuring that the resulting contour does not contain complex properties like loops.

In contrast to e.g., PixelContour::makeDense(), this function needs significantly more computational time while is able to handle more complex input contours.

Parameters

points

The points of any kind of contour which will be converted to a dense and distinct contour

Returns

The resulting dense and distinct contour

See also

PixelContour::makeDense().

createDenseContour() [2/2]

PixelContour Ocean::CV::Segmentation::ContourAnalyzer::createDenseContour ( const Vectors2 &  points )

inlinestatic

Creates a dense and distinct contour from any kind of given contour also ensuring that the resulting contour does not contain complex properties like loops.

In contrast to e.g., PixelContour::makeDense(), this function needs significantly more computational time while is able to handle more complex input contours.

Parameters

points

The points of any kind of contour which will be converted to a dense and distinct contour with sub-pixel accuracy

Returns

The resulting dense and distinct contour

curvature()

static Scalars Ocean::CV::Segmentation::ContourAnalyzer::curvature ( const PixelPositions &  contour, const unsigned int  offset  )

static

Determines the curvature for each contour pixel.

The resulting values are the cosine value of the angles between two vectors starting at the interest point pointing several pixels forward and backward in the contour.

Parameters

contour	The contour for which the curvature parameters will be determined
offset	Pixel offset inside the contour between the pixel of interest and the pixels to measure the curvature, with range [1, contour.size())

Returns

Cosine values giving the curvature of the contour, one value for each pixel in the contour (a value of 1 determines an angle of 90 deg, a value of 0 determines a value of +/- 180 deg)

determinePixelDirection()

PixelDirection Ocean::CV::Segmentation::ContourAnalyzer::determinePixelDirection ( const PixelPosition &  pixel0, const PixelPosition &  pixel1  )

inlinestaticprivate

Returns the pixel direction of two successive pixels in a dense contour.

Parameters

pixel0	First pixel
pixel1	Following pixel

Returns

Resulting pixel direction

equalizeContourDensity()

static Vectors2 Ocean::CV::Segmentation::ContourAnalyzer::equalizeContourDensity ( const Vectors2 &  contour )

static

Equalized a sparse contour according to the density of the locations of contour points.

Parameters

contour

The contour to be equalized

Returns

The resulting equalized contour

pixelPositionHashValueFunction()

size_t Ocean::CV::Segmentation::ContourAnalyzer::pixelPositionHashValueFunction ( const PixelPosition &  position )

inlinestaticprivate

Calculates a hash value for a given pixel position.

Parameters

position

Pixel position to determine the hash function for

Returns

Resulting hash function

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

• ContourAnalyzer.h