OpenCV >> C/C++

fast line detector

---

參考資訊：
1. example
2. createFastLineDetector

prototype

Ptr<FastLineDetector> cv::ximgproc::createFastLineDetector(
  int _length_threshold = 10,
  float _distance_threshold = 1.414213562f,
  double _canny_th1 = 50.0,
  double _canny_th2 = 50.0,
  int _canny_aperture_size = 3,
  bool _do_merge = false);

main.cpp

#include <iostream>
#include <opencv2/imgproc.hpp>
#include <opencv2/ximgproc.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
 
using namespace std;
using namespace cv;
using namespace cv::ximgproc;
 
int main(int argc, char** argv)
{
  Mat image = imread("main.jpg", IMREAD_GRAYSCALE);
  if(image.empty()){
    printf("failed to load image\n");
    return -1;
  }
  
  Ptr<FastLineDetector> fld = createFastLineDetector();
  vector<Vec4f> lines_fld;
  lines_fld.clear();
  fld->detect(image, lines_fld);

  Mat line_image_fld(image);
  fld->drawSegments(line_image_fld, lines_fld);
  imshow("FLD result", line_image_fld);
  waitKey();
  return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project(main)
find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
add_executable(main main.cpp)
target_link_libraries(main ${OpenCV_LIBS})

編譯並且執行

$ cmake .
$ make
$ ./main

完成

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