learnopencv/barcode-QRcodeScanner/barcode-QRcodeScanner.cpp

#include <opencv2/opencv.hpp>
#include <zbar.h>

using namespace cv;
using namespace std;
using namespace zbar;

typedef struct
{
  string type;
  string data;
  vector <Point> location;
} decodedObject;

// Find and decode barcodes and QR codes
void decode(Mat &im, vector<decodedObject>&decodedObjects)
{
  
  // Create zbar scanner
  ImageScanner scanner;

  // Configure scanner
  scanner.set_config(ZBAR_NONE, ZBAR_CFG_ENABLE, 1);
  
  // Convert image to grayscale
  Mat imGray;
  cvtColor(im, imGray,COLOR_BGR2GRAY);

  // Wrap image data in a zbar image
  Image image(im.cols, im.rows, "Y800", (uchar *)imGray.data, im.cols * im.rows);

  // Scan the image for barcodes and QRCodes
  int n = scanner.scan(image);
  
  // Print results
  for(Image::SymbolIterator symbol = image.symbol_begin(); symbol != image.symbol_end(); ++symbol)
  {
    decodedObject obj;
    
    obj.type = symbol->get_type_name();
    obj.data = symbol->get_data();
    
    // Print type and data
    cout << "Type : " << obj.type << endl;
    cout << "Data : " << obj.data << endl << endl;
    
    // Obtain location
    for(int i = 0; i< symbol->get_location_size(); i++)
    {
      obj.location.push_back(Point(symbol->get_location_x(i),symbol->get_location_y(i)));
    }
    
    decodedObjects.push_back(obj);
  }
}

// Display barcode and QR code location  
void display(Mat &im, vector<decodedObject>&decodedObjects)
{
  // Loop over all decoded objects
  for(int i = 0; i < decodedObjects.size(); i++)
  {
    vector<Point> points = decodedObjects[i].location;
    vector<Point> hull;
    
    // If the points do not form a quad, find convex hull
    if(points.size() > 4)
      convexHull(points, hull);
    else
      hull = points;
    
    // Number of points in the convex hull
    int n = hull.size();
    
    for(int j = 0; j < n; j++)
    {
      line(im, hull[j], hull[ (j+1) % n], Scalar(255,0,0), 3);
    }
    
  }
  
  // Display results 
  imshow("Results", im);
  waitKey(0);
  
}

int main(int argc, char* argv[])
{
  
  // Read image
  Mat im = imread("zbar-test.jpg");
  
  // Variable for decoded objects 
  vector<decodedObject> decodedObjects;
  
  // Find and decode barcodes and QR codes
  decode(im, decodedObjects);

  // Display location 
  display(im, decodedObjects);
  
  return EXIT_SUCCESS;
}