eVision.ELineDetector Class Reference

Detects straight lines in a BW8 image using Hough transform. More...

Inheritance diagram for eVision.ELineDetector:

Collaboration diagram for eVision.ELineDetector:

Public Member Functions
	ELineDetector (eVision.ELineDetector other)
	Copy operator.
	ELineDetector ()
	Constructs an ELineDetector.ELineDetector with all parameters explicitly specified.
	ELineDetector (float rho, float theta, int threshold, float minLineLength, float maxLineGap, float angleThresholdDegrees)
	Copy operator.
void	Save (string path)
	Saves the detector configuration to a file.
void	Load (string path)
	Loads a detector configuration from a file.
void	Save (eVision.ESerializer serializer)
	Saves the detector configuration to a serializer.
void	Load (eVision.ESerializer serializer)
	Loads a detector configuration from a serializer.
eVision.ELine[]	Detect (eVision.EROIBW8 image)
	Detects straight lines in the given BW8 image.
eVision.ELine[]	Detect (eVision.EROIBW8 image, eVision.ERegion region, eVision.EFrame frame)
	Detects lines in the area of the image covered by region (transformed to sensor coordinates via frame), then maps results back to local frame coordinates.
eVision.ELine[]	Detect (eVision.EROIBW8 image, eVision.ERegion region)
	Detects lines in the area of the image covered by region.
eVision.ELine[]	Detect (eVision.EROIBW8 image, eVision.EFrame frame)
	Detects lines in the image and maps results to local frame coordinates via frame.
eVision.ELine[]	Detect (eVision.ERegion region, eVision.EFrame frame)
	Transforms region to sensor coordinates via frame, converts it to a binary image, detects lines, then maps results back to local frame coordinates.
eVision.ELine[]	Detect (eVision.ERegion region)
	Converts region to a binary image and detects lines in it.
void	StopProcess ()
	Thread-safe. Requests the Detect call running on another thread to stop as soon as possible; it then returns no lines. The request is discarded when the next Detect call starts.

Properties
float	RadialBinSize [get, set]
	Distance resolution of the accumulator in pixels. Default is 1.
float	AngularBinSize [get, set]
	Angle resolution of the accumulator in degrees. Default is 1.
int	MinNumVotes [get, set]
	Minimum number of votes to qualify as a line. Default is 150.
float	MinLineLength [get, set]
	Minimum length of a detected line segment in pixels. Shorter segments are discarded. Default is 164.
float	MaxLineGap [get, set]
	Maximum gap between two collinear segments to still merge them into one line. Default is 64.
float	AngleThreshold [get, set]
	Maximum angular difference in degrees between two segments to consider them part of the same line. Default is 35°.
eVision.ELine[]	SegmentsBeforeMerging [get]
	Returns the raw line segments that were merged to build the lines, as returned by the last call to ELineDetector.Detect.

Detailed Description

Detects straight lines in a BW8 image using Hough transform.

License(s): EasyImage

Constructor & Destructor Documentation

ELineDetector() [1/3]

eVision.ELineDetector.ELineDetector

(

eVision.ELineDetector

other

)

Copy operator.

Parameters

other

Another ELineDetector.

ELineDetector() [2/3]

eVision.ELineDetector.ELineDetector

(

)

Constructs an ELineDetector.ELineDetector with all parameters explicitly specified.

ELineDetector() [3/3]

eVision.ELineDetector.ELineDetector	(	float	rho,
		float	theta,
		int	threshold,
		float	minLineLength,
		float	maxLineGap,
		float	angleThresholdDegrees )

Copy operator.

Member Function Documentation

Detect() [1/6]

eVision.ELine[] eVision.ELineDetector.Detect

(

eVision.ERegion

region

)

Converts region to a binary image and detects lines in it.

Parameters

region

Region to convert and detect lines in.

Detect() [2/6]

eVision.ELine[] eVision.ELineDetector.Detect	(	eVision.ERegion	region,
		eVision.EFrame	frame )

Transforms region to sensor coordinates via frame, converts it to a binary image, detects lines, then maps results back to local frame coordinates.

Parameters

region	Region in local frame coordinates.
frame	Frame used to transform region and results.

Detect() [3/6]

eVision.ELine[] eVision.ELineDetector.Detect

(

eVision.EROIBW8

image

)

Detects straight lines in the given BW8 image.

Parameters

image

Input BW8 image.

Detect() [4/6]

eVision.ELine[] eVision.ELineDetector.Detect	(	eVision.EROIBW8	image,
		eVision.EFrame	frame )

Detects lines in the image and maps results to local frame coordinates via frame.

Parameters

image	Input BW8 image.
frame	Frame used to transform results to local coordinates.

Detect() [5/6]

eVision.ELine[] eVision.ELineDetector.Detect	(	eVision.EROIBW8	image,
		eVision.ERegion	region )

Detects lines in the area of the image covered by region.

Parameters

image	Input BW8 image.
region	Region of interest in image coordinates.

Detect() [6/6]

eVision.ELine[] eVision.ELineDetector.Detect	(	eVision.EROIBW8	image,
		eVision.ERegion	region,
		eVision.EFrame	frame )

Detects lines in the area of the image covered by region (transformed to sensor coordinates via frame), then maps results back to local frame coordinates.

Parameters

image	Input BW8 image.
region	Region of interest in local frame coordinates.
frame	Frame used to transform region and results.

Load() [1/2]

void eVision.ELineDetector.Load

(

eVision.ESerializer

serializer

)

Loads a detector configuration from a serializer.

Parameters

serializer

Source serializer in read mode.

Load() [2/2]

void eVision.ELineDetector.Load

(

string

path

)

Loads a detector configuration from a file.

Parameters

path	Path to the input file.

Save() [1/2]

void eVision.ELineDetector.Save

(

eVision.ESerializer

serializer

)

Saves the detector configuration to a serializer.

Parameters

serializer

Target serializer in write mode.

Save() [2/2]

void eVision.ELineDetector.Save

(

string

path

)

Saves the detector configuration to a file.

Parameters

path	Path to the output file.

StopProcess()

void eVision.ELineDetector.StopProcess

(

)

Thread-safe. Requests the Detect call running on another thread to stop as soon as possible; it then returns no lines. The request is discarded when the next Detect call starts.

Property Documentation

AngleThreshold

float eVision.ELineDetector.AngleThreshold

getset

Maximum angular difference in degrees between two segments to consider them part of the same line. Default is 35°.

AngularBinSize

float eVision.ELineDetector.AngularBinSize

getset

Angle resolution of the accumulator in degrees. Default is 1.

MaxLineGap

float eVision.ELineDetector.MaxLineGap

getset

Maximum gap between two collinear segments to still merge them into one line. Default is 64.

MinLineLength

float eVision.ELineDetector.MinLineLength

getset

Minimum length of a detected line segment in pixels. Shorter segments are discarded. Default is 164.

MinNumVotes

int eVision.ELineDetector.MinNumVotes

getset

Minimum number of votes to qualify as a line. Default is 150.

RadialBinSize

float eVision.ELineDetector.RadialBinSize

getset

Distance resolution of the accumulator in pixels. Default is 1.

SegmentsBeforeMerging

eVision.ELine [] eVision.ELineDetector.SegmentsBeforeMerging

get

Returns the raw line segments that were merged to build the lines, as returned by the last call to ELineDetector.Detect.