vendor: OpenCV 5.0.0 snapshot at 755e50675d97db9b7d449d8bd6b09888646f6c6e

2026-08-22 00:11:13 +08:00
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+/*M///////////////////////////////////////////////////////////////////////////////////////
+ //
+ //  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+ //
+ //  By downloading, copying, installing or using the software you agree to this license.
+ //  If you do not agree to this license, do not download, install,
+ //  copy or use the software.
+ //
+ //
+ //                           License Agreement
+ //                For Open Source Computer Vision Library
+ //
+ // Copyright (C) 2014, Biagio Montesano, all rights reserved.
+ // Third party copyrights are property of their respective owners.
+ //
+ // Redistribution and use in source and binary forms, with or without modification,
+ // are permitted provided that the following conditions are met:
+ //
+ //   * Redistribution's of source code must retain the above copyright notice,
+ //     this list of conditions and the following disclaimer.
+ //
+ //   * Redistribution's in binary form must reproduce the above copyright notice,
+ //     this list of conditions and the following disclaimer in the documentation
+ //     and/or other materials provided with the distribution.
+ //
+ //   * The name of the copyright holders may not be used to endorse or promote products
+ //     derived from this software without specific prior written permission.
+ //
+ // This software is provided by the copyright holders and contributors "as is" and
+ // any express or implied warranties, including, but not limited to, the implied
+ // warranties of merchantability and fitness for a particular purpose are disclaimed.
+ // In no event shall the Intel Corporation or contributors be liable for any direct,
+ // indirect, incidental, special, exemplary, or consequential damages
+ // (including, but not limited to, procurement of substitute goods or services;
+ // loss of use, data, or profits; or business interruption) however caused
+ // and on any theory of liability, whether in contract, strict liability,
+ // or tort (including negligence or otherwise) arising in any way out of
+ // the use of this software, even if advised of the possibility of such damage.
+ //
+ //M*/
+
+#include <iostream>
+#include <opencv2/opencv_modules.hpp>
+
+#ifdef HAVE_OPENCV_FEATURES
+
+#include <opencv2/line_descriptor.hpp>
+#include <opencv2/core/utility.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/features.hpp>
+#include <opencv2/highgui.hpp>
+
+using namespace cv;
+using namespace cv::line_descriptor;
+using namespace std;
+
+static const char* keys =
+{ "{@image_path | | Image path }" };
+
+static void help()
+{
+  cout << "\nThis example shows the functionalities of lines extraction " << "furnished by BinaryDescriptor class\n"
+       << "Please, run this sample using a command in the form\n" << "./example_line_descriptor_lines_extraction <path_to_input_image>" << endl;
+}
+
+int main( int argc, char** argv )
+{
+  /* get parameters from comand line */
+  CommandLineParser parser( argc, argv, keys );
+  String image_path = parser.get<String>( 0 );
+
+  if( image_path.empty() )
+  {
+    help();
+    return -1;
+  }
+
+  /* load image */
+  cv::Mat imageMat = imread( image_path, 1 );
+  if( imageMat.data == NULL )
+  {
+    std::cout << "Error, image could not be loaded. Please, check its path" << std::endl;
+    return -1;
+  }
+
+  /* create a random binary mask */
+  cv::Mat mask = Mat::ones( imageMat.size(), CV_8UC1 );
+
+  /* create a pointer to a BinaryDescriptor object with deafult parameters */
+  Ptr<BinaryDescriptor> bd = BinaryDescriptor::createBinaryDescriptor();
+
+  /* create a structure to store extracted lines */
+  vector<KeyLine> lines;
+
+  /* extract lines */
+  cv::Mat output = imageMat.clone();
+  bd->detect( imageMat, lines, mask );
+
+  /* draw lines extracted from octave 0 */
+  if( output.channels() == 1 )
+    cvtColor( output, output, COLOR_GRAY2BGR );
+  for ( size_t i = 0; i < lines.size(); i++ )
+  {
+    KeyLine kl = lines[i];
+    if( kl.octave == 0)
+    {
+      /* get a random color */
+      int R = ( rand() % (int) ( 255 + 1 ) );
+      int G = ( rand() % (int) ( 255 + 1 ) );
+      int B = ( rand() % (int) ( 255 + 1 ) );
+
+      /* get extremes of line */
+      Point pt1 = Point2f( kl.startPointX, kl.startPointY );
+      Point pt2 = Point2f( kl.endPointX, kl.endPointY );
+
+      /* draw line */
+      line( output, pt1, pt2, Scalar( B, G, R ), 3 );
+    }
+
+  }
+
+  /* show lines on image */
+  imshow( "Lines", output );
+  waitKey();
+}
+
+#else
+
+int main()
+{
+    std::cerr << "OpenCV was built without features module" << std::endl;
+    return 0;
+}
+
+#endif // HAVE_OPENCV_FEATURES