Subversion Repositories OpenCV2-Cookbook

/*------------------------------------------------------------------------------------------*\

   This file contains material supporting chapter 6 of the cookbook:  

   Computer Vision Programming using the OpenCV Library.

   by Robert Laganiere, Packt Publishing, 2011.

   This program is free software; permission is hereby granted to use, copy, modify,

   and distribute this source code, or portions thereof, for any purpose, without fee,

   subject to the restriction that the copyright notice may not be removed

   or altered from any source or altered source distribution.

   The software is released on an as-is basis and without any warranties of any kind.

   In particular, the software is not guaranteed to be fault-tolerant or free from failure.

   The author disclaims all warranties with regard to this software, any use,

   and any consequent failure, is purely the responsibility of the user.

   Copyright (C) 2010-2011 Robert Laganiere, www.laganiere.name

\*------------------------------------------------------------------------------------------*/

#if !defined SOBELEDGES

#define SOBELEDGES

#define PI 3.1415926

#include <opencv2/core/core.hpp>

#include <opencv2/imgproc/imgproc.hpp>

class EdgeDetector {

  private:

          // original image

          cv::Mat img;

          // 16-bit signed int image

          cv::Mat sobel;

          // Aperture size of the Sobel kernel

          int aperture;

          // Sobel magnitude

          cv::Mat sobelMagnitude;

          // Sobel orientation

          cv::Mat sobelOrientation;

  public:

          EdgeDetector() : aperture(3) {}

          // Set the aperture size of the kernel

          void setAperture(int a) {

                  aperture= a;

          }

          // Get the aperture size of the kernel

          int getAperture() const {

                  return aperture;

          }

          // Compute the Sobel

          void computeSobel(const cv::Mat& image, cv::Mat &sobelX=cv::Mat(), cv::Mat &sobelY=cv::Mat()) {

                  // Compute Sobel

                  cv::Sobel(image,sobelX,CV_32F,1,0,aperture);

                  cv::Sobel(image,sobelY,CV_32F,0,1,aperture);

                  // Compute magnitude and orientation

                  cv::cartToPolar(sobelX,sobelY,sobelMagnitude,sobelOrientation);

          }

          // Get Sobel magnitude

          // Make a copy if called more than once

          cv::Mat getMagnitude() {

                  return sobelMagnitude;

          }

          // Get Sobel orientation

          // Make a copy if called more than once

          cv::Mat getOrientation() {

                  return sobelOrientation;

          }

          // Get a thresholded binary map

          cv::Mat getBinaryMap(double threshold) {

                  cv::Mat bin;           

                  cv::threshold(sobelMagnitude,bin,threshold,255,cv::THRESH_BINARY_INV);

                  return bin;

          }

          // Get a CV_8U image of the Sobel

          cv::Mat getSobelImage() {

                  cv::Mat bin;

                  double minval, maxval;

                  cv::minMaxLoc(sobelMagnitude,&minval,&maxval);

                  sobelMagnitude.convertTo(bin,CV_8U,255/maxval);

                  return bin;

          }

          // Get a CV_8U image of the Sobel orientation

          // 1 gray-level = 2 degrees

          cv::Mat getSobelOrientationImage() {

                  cv::Mat bin;

                  sobelOrientation.convertTo(bin,CV_8U,90/PI);

                  return bin;

          }

};

#endif