Class FastLineDetector


  • public class FastLineDetector
    extends Algorithm
    Class implementing the FLD (Fast Line Detector) algorithm described in CITE: Lee14 .
    • Constructor Detail

      • FastLineDetector

        protected FastLineDetector​(long addr)
    • Method Detail

      • 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. ![image](pics/corridor_fld.jpg)
        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,
                                 Scalar linecolor,
                                 int linethickness)
        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.
        linecolor - Line color.
        linethickness - Line thickness.
      • drawSegments

        public void drawSegments​(Mat image,
                                 Mat lines,
                                 boolean draw_arrow,
                                 Scalar linecolor)
        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.
        linecolor - Line color.
      • 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.