Tutorial: Scanning Barcodes / QR Codes with OpenCV using ZBar

Categories Computer Vision, Uncategorized
screenshot.12
With the ZBar library, scanning Barcodes / QR codes is quite simple. ZBar is able to identify multiple bar code /qr code types and able to give the coords of their locations.

This tutorial was written using:
Microsoft Visual Studio 2008 Express
OpenCV 2.4.2
Windows Vista 32-bit
ZBar 0.1

You will need OpenCV installed before doing this tutorial

Tutorial here: http://ayoungprogrammer.blogspot.ca/2012/10/tutorial-install-opencv-242-for-windows.html

1. Install ZBar (Windows Installer)

http://sourceforge.net/projects/zbar/files/zbar/0.10/zbar-0.10-setup.exe/download

Check install developmental libraries and headers (You will need this)

Install ZBar in the default directory
“C:Program FilesZBar”

2. Import headers and libraries

Tools ->Options 

Projects & Solutions -> VC++ Directories
Go to “Include files” and add: “C:Program FilesZBarinclude”

 Go to “Library files and add: “C:Program FilesZBarlib”

3. Link libraries in current project

Create an empy blank console project
Right click your project -> Properties -> Configuration Properties -> Linker -> Input

In additional dependencies copy and paste the following:
libzbar-0.lib
opencv_core242d.lib
opencv_imgproc242d.lib
opencv_highgui242d.lib
opencv_ml242d.lib
opencv_video242d.lib
opencv_features2d242d.lib
opencv_calib3d242d.lib
opencv_objdetect242d.lib
opencv_contrib242d.lib
opencv_legacy242d.lib
opencv_flann242d.lib

4. Test Program

Make a new file in your project: main.cpp
 #include "zbar.h"  
 #include "cv.h"  
 #include "highgui.h"  
 #include <iostream>  
 using namespace std;  
 using namespace zbar;  
 using namespace cv;  
 int main(void){  
      ImageScanner scanner;  
      scanner.set_config(ZBAR_NONE, ZBAR_CFG_ENABLE, 1);  
       // obtain image data  
      char file[256];  
      cin>>file;  
      Mat img = imread(file,0);  
      Mat imgout;  
      cvtColor(img,imgout,CV_GRAY2RGB);  
      int width = img.cols;  
      int height = img.rows;  
   uchar *raw = (uchar *)img.data;  
   // wrap image data  
   Image image(width, height, "Y800", raw, width * height);  
   // scan the image for barcodes  
   int n = scanner.scan(image);  
   // extract results  
   for(Image::SymbolIterator symbol = image.symbol_begin();  
     symbol != image.symbol_end();  
     ++symbol) {  
                vector<Point> vp;  
     // do something useful with results  
     cout << "decoded " << symbol->get_type_name()  
        << " symbol "" << symbol->get_data() << '"' <<" "<< endl;  
           int n = symbol->get_location_size();  
           for(int i=0;i<n;i++){  
                vp.push_back(Point(symbol->get_location_x(i),symbol->get_location_y(i))); 
           }  
           RotatedRect r = minAreaRect(vp);  
           Point2f pts[4];  
           r.points(pts);  
           for(int i=0;i<4;i++){  
                line(imgout,pts[i],pts[(i+1)%4],Scalar(255,0,0),3);  
           }  
           cout<<"Angle: "<<r.angle<<endl;  
   }  
      imshow("imgout.jpg",imgout);  
   // clean up  
   image.set_data(NULL, 0);  
       waitKey();  
 }  

5. Copy libzbar-0.dll from C:/Program Files/ZBar/bin to your project folder

6. Run program 

Sample Images

Creating a Ribbon Add-in for Office Word in NetOffice Visual Studio Express 2008 without VSTO

Categories Uncategorized
addin1
Usually, to create an add-in for office, you will need Visual Studio Tools for Office (VSTO) which you will need to buy with Visual Studio Professional Edition which is something like $800. However, there are free alternative which work quite well: NetOffice. NetOffice is a free C# / VB library you can use to create your own ribbon add-ins for Office. In this tutorial we will be doing Word.

1. Install NetOffice

Extract the folder somewhere convenient

2. Create a project

Run NetOffice.DevelopToolbox
Go to VS Project Wizard tab -> Click New project 
Select automatic add-in under project type 
Select VS2008 Express under Environment
Select C# under Language (or VB if you want to use VB instead)
Version 3.5 .NET runtime
Select VS Project folder under project folder
Check off Word
Fill out the description of your add-in
Fill out additional options
Check out I want to customize Ribbon UI
Hit finish

3. Run Project

Open project with C# Visual Studio Express 2008
You should have these files already in:
Compile the project (Press F5)
You should get this error:

4. Run Office Word 2007

And we should have our first add-in working:
If you click any of the buttons, you will get a message box!