Semichev. Working detection of only one object

apps/detector _semichev.cpp

@@ -0,0 +1,108 @@
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "opencv2/core/core.hpp"
+#include "opencv2/highgui/highgui.hpp"
+#include "opencv2/objdetect/objdetect.hpp"
+
+using namespace std;
+using namespace cv;
+
+const char* params =
+     "{ h | help     | false | print usage                                   }"
+     "{   | detector |       | XML file with a cascade detector              }"
+     "{   | image    |       | image to detect objects on                    }"
+     "{   | video    |       | video file to detect on                       }"
+     "{   | camera   | false | whether to detect on video stream from camera }";
+
+
+void drawDetections(const vector<Rect>& detections,
+                    const Scalar& color,
+                    Mat& image)
+{
+    for (size_t i = 0; i < detections.size(); ++i)
+    {
+        rectangle(image, detections[i], color, 2);
+    }
+}
+
+const Scalar red(0, 0, 255);
+const Scalar green(0, 255, 0);
+const Scalar blue(255, 0, 0);
+const Scalar colors[] = {red, green, blue};
+
+int main(int argc, char** argv)
+{
+    // Parse command line arguments.
+    CommandLineParser parser(argc, argv, params);
+    // If help flag is present, print help message and exit.
+    if (parser.get<bool>("help"))
+    {
+        parser.printParams();
+        return 0;
+    }
+
+    string detector_file = parser.get<string>("detector");
+    CV_Assert(!detector_file.empty());
+    string image_file = parser.get<string>("image");
+    string video_file = parser.get<string>("video");
+    bool use_camera = parser.get<bool>("camera");
+
+    CascadeClassifier detector;
+    detector.load(detector_file);
+
+    char key = 0;
+
+    if (!image_file.empty())
+    {
+        Mat image = imread(image_file);
+        vector<Rect> objects;
+        detector.detectMultiScale(image, objects);
+        drawDetections(objects, Scalar(255, 0, 0), image);
+        while (key != 27)
+        {
+            imshow("Detection", image);
+            key = waitKey();
+        }
+    }
+    else if (!video_file.empty())
+    {
+    }
+    else if (use_camera)
+    {
+        VideoCapture video;
+        video.open(0);
+        Mat image;
+        if (!video.isOpened())
+        {
+            cout << "Video not opened";
+            return 0;
+        }
+        while (key != 27)
+        {
+            video >> image;
+            if (image.empty())
+            {
+                cout << "Not image";
+            }
+            else
+            {
+                vector<Rect> objects;
+                detector.detectMultiScale(image, objects);
+                drawDetections(objects, Scalar(255, 0, 0), image);
+                imshow("Detection", image);
+                key = waitKey(1);
+            }
+        }
+    }
+    else
+    {
+        cout << "Declare a source of images to detect on." << endl;
+    }
+
+    return 0;
+}
+
+
+