org.opencv.ximgproc

Class FastLineDetector

java.lang.Object

org.opencv.core.Algorithm

org.opencv.ximgproc.FastLineDetector

public class FastLineDetector
extends Algorithm

Class implementing the FLD (Fast Line Detector) algorithm described in CITE: Lee14 .

Field Summary

Fields inherited from class org.opencv.core.Algorithm

nativeObj

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FastLineDetector(long addr)

Method Summary

Modifier and Type	Method and Description
static FastLineDetector	__fromPtr__(long addr)
void	detect(Mat _image, Mat _lines) Finds lines in the input image.
void	drawSegments(Mat _image, Mat lines) Draws the line segments on a given image.
void	drawSegments(Mat _image, Mat lines, boolean draw_arrow) Draws the line segments on a given image.
protected void	finalize()

Methods inherited from class org.opencv.core.Algorithm

clear, empty, getDefaultName, getNativeObjAddr, save

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FastLineDetector

protected FastLineDetector(long addr)

Method Detail

__fromPtr__

public static FastLineDetector __fromPtr__(long addr)

detect

public void detect(Mat _image,
                   Mat _lines)

Finds lines in the input image. This is the output of the default parameters of the algorithm on the above shown image. 

Parameters:

_image - A grayscale (CV_8UC1) input image. If only a roi needs to be selected, use: `fld_ptr->detect(image(roi), lines, ...); lines += Scalar(roi.x, roi.y, roi.x, roi.y);`

_lines - A vector of Vec4f elements specifying the beginning and ending point of a line. Where Vec4f is (x1, y1, x2, y2), point 1 is the start, point 2 - end. Returned lines are directed so that the brighter side is on their left.

drawSegments

public void drawSegments(Mat _image,
                         Mat lines,
                         boolean draw_arrow)

Draws the line segments on a given image.

Parameters:

_image - The image, where the lines will be drawn. Should be bigger or equal to the image, where the lines were found.

lines - A vector of the lines that needed to be drawn.

draw_arrow - If true, arrow heads will be drawn.

drawSegments

public void drawSegments(Mat _image,
                         Mat lines)

Draws the line segments on a given image.

Parameters:

_image - The image, where the lines will be drawn. Should be bigger or equal to the image, where the lines were found.

lines - A vector of the lines that needed to be drawn.

finalize

protected void finalize()
                 throws Throwable

Overrides:

finalize in class Algorithm

Throws:

Throwable