title: read numbers and letters from an image using openCV
body: <p>I am developing an application to read the letters and numbers from an image using opencv in c++. I first changed the given colour image and colour template to binary image, then called the method cvMatchTemplate(). This method just highlighted the areas where the template matches.. But not clear..  I just dont want to see the area.. I need to parse the characters(letters &amp; numbers) from the image. I am new to openCV. Does anybody know any other method to get the result??</p>
  
  <p><img src="https://i.stack.imgur.com/oHYXo.jpg" alt="alt text"></p>
  
  <p>Image is taken from camera. the sample image is shown above. I need to get all the texts from the LED display(130 and Delft Tanthaf).</p>
  
  <p>Friends I tried with the sample application of face detection, It detects the faces. the HaarCascade file is provided with the openCV. I just loaded that file and called the method cvHaarDetectObjects(); To detect the letters I created the xml file by using the application letter_recog.cpp provided by openCV. But when I loading this file, it shows some error(OpenCV error: UnSpecified error > in unknown function, file ........\ocv\opencv\src\cxcore\cxpersistence.cpp,line 4720). I searched in web for this error and got the information about lib files used. I did so, but the error still remains. Is the error with my xml file or calling the method to load this xml file((CvHaarClassifierCascade*)cvLoad("builded xml file name",0,0,0);)?? please HELP...</p>
  
  <p>Thanks in advance</p>