From bf688f0a5614d9f02cadb5e111f83896a75f1065 Mon Sep 17 00:00:00 2001
From: Suleyman TURKMEN <sturkmen@hotmail.com>
Date: Sat, 7 Sep 2019 04:11:40 +0300
Subject: [PATCH] Update bgfg.cpp

---
 modules/bgsegm/samples/bgfg.cpp | 97 ++++++++++++++++++++-------------
 1 file changed, 60 insertions(+), 37 deletions(-)

diff --git a/modules/bgsegm/samples/bgfg.cpp b/modules/bgsegm/samples/bgfg.cpp
index 773f32d29..cbb2cfcce 100644
--- a/modules/bgsegm/samples/bgfg.cpp
+++ b/modules/bgsegm/samples/bgfg.cpp
@@ -8,15 +8,15 @@ using namespace cv;
 using namespace cv::bgsegm;
 
 const String about =
-    "\nA program demonstrating the use and capabilities of different background subtraction algrorithms\n"
+    "\nA program demonstrating the use and capabilities of different background subtraction algorithms\n"
     "Using OpenCV version " + String(CV_VERSION) +
-    "\nPress q or ESC to exit\n";
+    "\n\nPress 'c' to change the algorithm"
+    "\nPress 'm' to toggle showing only foreground mask or ghost effect"
+    "\nPress 'n' to change number of threads"
+    "\nPress SPACE to toggle wait delay of imshow"
+    "\nPress 'q' or ESC to exit\n";
 
-const String keys =
-        "{help h usage ? |      | print this message   }"
-        "{vid            |      | path to a video file }"
-        "{algo           | GMG  | name of the algorithm (GMG, CNT, KNN, MOG, MOG2) }"
-        ;
+const String algos[7] = { "GMG", "CNT", "KNN", "MOG", "MOG2", "GSOC", "LSBP" };
 
 static Ptr<BackgroundSubtractor> createBGSubtractorByName(const String& algoName)
 {
@@ -31,42 +31,26 @@ static Ptr<BackgroundSubtractor> createBGSubtractorByName(const String& algoName
         algo = createBackgroundSubtractorMOG();
     else if(algoName == String("MOG2"))
         algo = createBackgroundSubtractorMOG2();
+    else if(algoName == String("GSOC"))
+        algo = createBackgroundSubtractorGSOC();
+    else if(algoName == String("LSBP"))
+        algo = createBackgroundSubtractorLSBP();
 
     return algo;
 }
 
 int main(int argc, char** argv)
 {
-    CommandLineParser parser(argc, argv, keys);
+    CommandLineParser parser(argc, argv, "{@video | vtest.avi | path to a video file}");
     parser.about(about);
     parser.printMessage();
-    if (parser.has("help"))
-    {
-        parser.printMessage();
-        return 0;
-    }
 
-    String videoPath = parser.get<String>("vid");
-    String algoName = parser.get<String>("algo");
+    String videoPath = samples::findFile(parser.get<String>(0),false);
 
-    if (!parser.check())
-    {
-        parser.printErrors();
-        return 0;
-    }
-
-    Ptr<BackgroundSubtractor> bgfs = createBGSubtractorByName(algoName);
-    if (!bgfs)
-    {
-        std::cerr << "Failed to create " << algoName << " background subtractor" << std::endl;
-        return -1;
-    }
+    Ptr<BackgroundSubtractor> bgfs = createBGSubtractorByName(algos[0]);
 
     VideoCapture cap;
-    if (argc > 1)
-        cap.open(videoPath);
-    else
-        cap.open(0);
+    cap.open(videoPath);
 
     if (!cap.isOpened())
     {
@@ -76,24 +60,63 @@ int main(int argc, char** argv)
 
     Mat frame, fgmask, segm;
 
-    namedWindow("FG Segmentation", WINDOW_NORMAL);
+    int delay = 30;
+    int algo_index = 0;
+    int nthreads = getNumberOfCPUs();
+    bool show_fgmask = false;
 
     for (;;)
     {
         cap >> frame;
 
         if (frame.empty())
-            break;
+        {
+            cap.set(CAP_PROP_POS_FRAMES, 0);
+            cap >> frame;
+        }
 
         bgfs->apply(frame, fgmask);
 
-        frame.convertTo(segm, CV_8U, 0.5);
-        add(frame, Scalar(100, 100, 0), segm, fgmask);
+        if (show_fgmask)
+            segm = fgmask;
+        else
+        {
+            frame.convertTo(segm, CV_8U, 0.5);
+            add(frame, Scalar(100, 100, 0), segm, fgmask);
+        }
+
+        putText(segm, algos[algo_index], Point(10, 30), FONT_HERSHEY_PLAIN, 2.0, Scalar(255, 0, 255), 2, LINE_AA);
+        putText(segm, format("%d threads", nthreads), Point(10, 60), FONT_HERSHEY_PLAIN, 2.0, Scalar(255, 0, 255), 2, LINE_AA);
 
         imshow("FG Segmentation", segm);
 
-        int c = waitKey(30);
-        if (c == 'q' || c == 'Q' || (c & 255) == 27)
+        int c = waitKey(delay);
+
+        if (c == ' ')
+            delay = delay == 30 ? 1 : 30;
+
+        if (c == 'c' || c == 'C')
+        {
+            algo_index++;
+            if ( algo_index > 6 )
+                 algo_index = 0;
+
+            bgfs = createBGSubtractorByName(algos[algo_index]);
+        }
+
+        if (c == 'n' || c == 'N')
+        {
+            nthreads++;
+            if ( nthreads > 8 )
+                 nthreads = 1;
+
+            setNumThreads(nthreads);
+        }
+
+        if (c == 'm' || c == 'M')
+            show_fgmask = !show_fgmask;
+
+        if (c == 'q' || c == 'Q' || c  == 27)
             break;
     }