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opencv_tutorials_t7 [2016/06/07 15:41] – joaomatosopencv_tutorials_t7 [2016/06/07 15:50] – joaomatos
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  I recommend you to type the code on your own to get familiarized with the program language. If you have trouble , the original code is attached bellow ( Running on Visual Studio 2015 + OpenCV 3.1 ) * Check the installation guide to make sure that you linked all the OpenCV modules to your Visual Studio.  I recommend you to type the code on your own to get familiarized with the program language. If you have trouble , the original code is attached bellow ( Running on Visual Studio 2015 + OpenCV 3.1 ) * Check the installation guide to make sure that you linked all the OpenCV modules to your Visual Studio.
 +
 +
  
 ---- ----
 ===== Tracking an object using image moments ===== ===== Tracking an object using image moments =====
  
 +{{ ::track_moment.jpg?direct |}}
  
 <Code C++ linenums:1> <Code C++ linenums:1>
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 //Function to track an object using image moments. //Function to track an object using image moments.
-void TrackObject(int &x, int &y, Mat threshold, Mat &image) {+void TrackObject(Mat threshold, Mat &image) {
  
  //We will not use the threshold image directly we will use a copy  //We will not use the threshold image directly we will use a copy
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  threshold.copyTo(temp);  threshold.copyTo(temp);
  
 +        //x and y values for the location of the object
 + int x = 0, y = 0;
  
  //Initializing two vectors to be used on the findContours function  //Initializing two vectors to be used on the findContours function
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  //matrix storage for binary threshold image  //matrix storage for binary threshold image
  Mat threshold;  Mat threshold;
- //x and y values for the location of the object +
- int x = 0, y = 0;+
  //create slider bars for HSV filtering  //create slider bars for HSV filtering
  createTrackbars();  createTrackbars();
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  if (useTrack)  if (useTrack)
  {  {
- TrackObject(x, y, threshold, coloredimage);+ TrackObject(threshold, coloredimage);
  }  }
  
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 <Code C++ linenums:84> <Code C++ linenums:84>
 //Function to track an object using image moments. //Function to track an object using image moments.
-void TrackObject(int &x, int &y, Mat threshold, Mat &image) {+void TrackObject(Mat threshold, Mat &image) {
    
  //We will not use the threshold image directly we will use a copy  //We will not use the threshold image directly we will use a copy
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  threshold.copyTo(temp);  threshold.copyTo(temp);
                  
 +        //x and y values for the location of the object
 + int x = 0, y = 0;
 +
         //Tracking success.         //Tracking success.
  bool objectFound = false;  bool objectFound = false;
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  Here we create the on/off toggles to use the morphological transformations (by pressing 'm') and to run the tracking algorithm (by pressing 't') . Each time 'm' or 't' is pressed the Booleans useTrack and useFeatures will change values from TRUE to FALSE and vice-versa. Every time these values are TRUE , it will enter inside the conditional loop that will call the respective functions , **"DilateAndErode()"** and **"TrackObject()"**.  Here we create the on/off toggles to use the morphological transformations (by pressing 'm') and to run the tracking algorithm (by pressing 't') . Each time 'm' or 't' is pressed the Booleans useTrack and useFeatures will change values from TRUE to FALSE and vice-versa. Every time these values are TRUE , it will enter inside the conditional loop that will call the respective functions , **"DilateAndErode()"** and **"TrackObject()"**.
  
 +
 +----
 +<Code C++ linenums:226>
 +                //show frames 
 + imshow("Threshold Image", threshold);
 + imshow("Live Web Cam", coloredimage);
 + imshow("HSV Image", HSV);
    
 + key = waitKey(25);
 + 
 + }
 + 
 + 
 + 
 + return 0;
 +}
 + 
 +</Code>
 +
 + Finally we open and display three different windows to show the Live web cam video , the threshold version and the HSV version. The key value is updated using **"key = waitKey(25)"**. And our program is done !
opencv_tutorials_t7.txt · Last modified: 2016/06/07 15:57 by joaomatos