Merge pull request #1119 from 23pointsNorth:lsd

samples/cpp/lsd_lines.cpp

@@ -0,0 +1,54 @@
+#include <iostream>
+#include <string>
+
+#include "opencv2/core/core.hpp"
+#include "opencv2/core/utility.hpp"
+#include "opencv2/imgproc/imgproc.hpp"
+#include "opencv2/highgui/highgui.hpp"
+
+using namespace std;
+using namespace cv;
+
+int main(int argc, char** argv)
+{
+    std::string in;
+    if (argc != 2)
+    {
+        std::cout << "Usage: lsd_lines [input image]. Now loading building.jpg" << std::endl;
+        in = "building.jpg";
+    }
+    else
+    {
+        in = argv[1];
+    }
+
+    Mat image = imread(in, IMREAD_GRAYSCALE);
+
+#if 0
+    Canny(image, image, 50, 200, 3); // Apply canny edge
+#endif
+
+    // Create and LSD detector with standard or no refinement.
+#if 1
+    Ptr<LineSegmentDetector> ls = createLineSegmentDetectorPtr(LSD_REFINE_STD);
+#else
+    Ptr<LineSegmentDetector> ls = createLineSegmentDetectorPtr(LSD_REFINE_NONE);
+#endif
+
+    double start = double(getTickCount());
+    vector<Vec4i> lines_std;
+
+    // Detect the lines
+    ls->detect(image, lines_std);
+
+    double duration_ms = (double(getTickCount()) - start) * 1000 / getTickFrequency();
+    std::cout << "It took " << duration_ms << " ms." << std::endl;
+
+    // Show found lines
+    Mat drawnLines(image);
+    ls->drawSegments(drawnLines, lines_std);
+    imshow("Standard refinement", drawnLines);
+
+    waitKey();
+    return 0;
+}