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C#.net - Read Text from Image in C#.net

In this article i will show you how to read text from image by using OCR Components in C#.net.


What is OCR?
OCR (Optical Character Recognition) is the recognition of printed or written text characters by a computer. This involves photoscanning of the text character-by-character, analysis of the scanned-in image, and then translation of the character image into character codes, such as ASCII, commonly used in data processing.


OCR translates images of text, such as scanned documents, into actual text characters. Also known as text recognition, OCR makes it possible to edit and reuse the text that is normally locked inside scanned images. OCR works using a form of artificial intelligence known as pattern recognition, to identify individual text characters on a page, including punctuation marks, spaces, and ends of lines.


First off, you need to have MS Office 2007 installed or later version. This is obviously a dependency if you develop an application to use the OCR capabilites in the field – it won’t work without Office installed. Furthermore, the OCR capability doesn’t install by default when you install Office, you need to add a component called ‘Microsoft Office Document Imaging’ (MODI).


Instructions on how to add the required MODI component.


Step 1
Click Start, click Run, type appwiz.cpl in the Open box, and then click OK.


Step 2
Click to select the Office 2007 version that you have installed.


Step 3
Click Change.


Step 4
Click Add or Remove Features, and then click Continue.


Step 5
Expand Office Tools.

Click on Image for better View.


Step 6
Click Microsoft Office Document Imaging, and then click Run all from My Computer.

Click on Image for better View.


Step 7
Click Continue.


Now MODI Components installed on your Machine.lets create OCR Application in Visual Stdio.


Step 8
Create a Console Application and give the solution name as SolReadTextFromImage.


Step 9
Copy a Sample image file in Application BaseDirectory.(./bin/debug/SampleImage.JPG)

Click on Image for better View.


Step 10
Add a MODI Reference in our application.so we can use in our application for reading text from image.Right Click on project in Solution Explorer.right click on References,select the COM tab,then select Microsoft Office Document Imaging 12.0 Type Library.  

Click on Image for better View.


Step 11
The Code below will read text from image and store in text file,it is look like this

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1. #region Methods   
2.   
3.         /// <summary>   
4.         ///  Read Text from Image and display in console App   
5.         /// </summary>   
6.         /// <param name="ImagePath">specify the Image Path</param>   
7.         private static void ReadTextFromImage(String ImagePath)   
8.         {   
9.             try  
10.             {   
11.                 // Grab Text From Image   
12.                 MODI.Document ModiObj = new MODI.Document();   
13.                 ModiObj.Create(ImagePath);   
14.                 ModiObj.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);   
15.   
16.                 //Retrieve the text gathered from the image   
17.                 MODI.Image ModiImageObj = (MODI.Image)ModiObj.Images[0];   
18.                    
19.   
20.                 System.Console.WriteLine(ModiImageObj.Layout.Text);   
21.   
22.                 ModiObj.Close();   
23.             }   
24.             catch (Exception ex)   
25.             {   
26.                 throw new Exception(ex.Message);   
27.             }   
28.         }   
29.   
30.         /// <summary>   
31.         ///  Read Text from Image and Store in Text File   
32.         /// </summary>   
33.         /// <param name="ImagePath">specify the Image Path</param>   
34.         /// <param name="StoreTextFilePath">Specify the Store Text File</param>   
35.         private static void ReadTextFromImage(String ImagePath, String StoreTextFilePath)   
36.         {   
37.             try  
38.             {   
39.                 // Grab Text From Image   
40.                 MODI.Document ModiObj = new MODI.Document();   
41.                 ModiObj.Create(ImagePath);   
42.                 ModiObj.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);   
43.   
44.                 //Retrieve the text gathered from the image   
45.                 MODI.Image ModiImageObj = (MODI.Image)ModiObj.Images[0];   
46.                   
47.   
48.                 // Store Image Content in Text File   
49.                 FileStream CreateFileObj = new FileStream(StoreTextFilePath, FileMode.Create);   
50.                 //save the image text in the text file    
51.                 StreamWriter WriteFileObj = new StreamWriter(CreateFileObj);   
52.                 WriteFileObj.Write(ModiImageObj.Layout.Text);   
53.                 WriteFileObj.Close();   
54.   
55.                 ModiObj.Close();   
56.             }   
57.             catch (Exception ex)   
58.             {   
59.                 throw new Exception(ex.Message);    
60.             }   
61.         }  
62.  
63.         #endregion   
64.   
65.           

#region Methods

        /// <summary>
        ///  Read Text from Image and display in console App
        /// </summary>
        /// <param name="ImagePath">specify the Image Path</param>
        private static void ReadTextFromImage(String ImagePath)
        {
            try
            {
                // Grab Text From Image
                MODI.Document ModiObj = new MODI.Document();
                ModiObj.Create(ImagePath);
                ModiObj.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);

                //Retrieve the text gathered from the image
                MODI.Image ModiImageObj = (MODI.Image)ModiObj.Images[0];
                

                System.Console.WriteLine(ModiImageObj.Layout.Text);

                ModiObj.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /// <summary>
        ///  Read Text from Image and Store in Text File
        /// </summary>
        /// <param name="ImagePath">specify the Image Path</param>
        /// <param name="StoreTextFilePath">Specify the Store Text File</param>
        private static void ReadTextFromImage(String ImagePath, String StoreTextFilePath)
        {
            try
            {
                // Grab Text From Image
                MODI.Document ModiObj = new MODI.Document();
                ModiObj.Create(ImagePath);
                ModiObj.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);

                //Retrieve the text gathered from the image
                MODI.Image ModiImageObj = (MODI.Image)ModiObj.Images[0];
               

                // Store Image Content in Text File
                FileStream CreateFileObj = new FileStream(StoreTextFilePath, FileMode.Create);
                //save the image text in the text file 
                StreamWriter WriteFileObj = new StreamWriter(CreateFileObj);
                WriteFileObj.Write(ModiImageObj.Layout.Text);
                WriteFileObj.Close();

                ModiObj.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message); 
            }
        }

        #endregion

        

Step 12
Call both methods in main function,it is look like this

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1. static void Main(string[] args)   
2.         {   
3.             // Set Sample Image Path   
4.             String ImagePath = AppDomain.CurrentDomain.BaseDirectory + "SampleImage.jpg";   
5.   
6.             ReadTextFromImage(ImagePath);   
7.   
8.             // Set Store Image Content text file Path   
9.             String StoreTextFilePath = AppDomain.CurrentDomain.BaseDirectory + "SampleText.txt";   
10.   
11.             ReadTextFromImage(ImagePath, StoreTextFilePath);   
12.         }  

static void Main(string[] args)
        {
            // Set Sample Image Path
            String ImagePath = AppDomain.CurrentDomain.BaseDirectory + "SampleImage.jpg";

            ReadTextFromImage(ImagePath);

            // Set Store Image Content text file Path
            String StoreTextFilePath = AppDomain.CurrentDomain.BaseDirectory + "SampleText.txt";

            ReadTextFromImage(ImagePath, StoreTextFilePath);
        }

Full Code

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1. using System;   
2. using System.Collections.Generic;   
3. using System.Linq;   
4. using System.Text;   
5. using System.IO;   
6.   
7.   
8. namespace SolReadTextFromImage   
9. {   
10.     class Program   
11.     {   
12.         static void Main(string[] args)   
13.         {   
14.             // Set Sample Image Path   
15.             String ImagePath = AppDomain.CurrentDomain.BaseDirectory + "SampleImage.jpg";   
16.   
17.             ReadTextFromImage(ImagePath);   
18.   
19.             // Set Store Image Content text file Path   
20.             String StoreTextFilePath = AppDomain.CurrentDomain.BaseDirectory + "SampleText.txt";   
21.   
22.             ReadTextFromImage(ImagePath, StoreTextFilePath);   
23.         }  
24.  
25.         #region Methods   
26.   
27.         /// <summary>   
28.         ///  Read Text from Image and display in console App   
29.         /// </summary>   
30.         /// <param name="ImagePath">specify the Image Path</param>   
31.         private static void ReadTextFromImage(String ImagePath)   
32.         {   
33.             try  
34.             {   
35.                 // Grab Text From Image   
36.                 MODI.Document ModiObj = new MODI.Document();   
37.                 ModiObj.Create(ImagePath);   
38.                 ModiObj.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);   
39.   
40.                 //Retrieve the text gathered from the image   
41.                 MODI.Image ModiImageObj = (MODI.Image)ModiObj.Images[0];   
42.                   
43.   
44.                 System.Console.WriteLine(ModiImageObj.Layout.Text);   
45.   
46.                 ModiObj.Close();   
47.             }   
48.             catch (Exception ex)   
49.             {   
50.                 throw new Exception(ex.Message);   
51.             }   
52.         }   
53.   
54.         /// <summary>   
55.         ///  Read Text from Image and Store in Text File   
56.         /// </summary>   
57.         /// <param name="ImagePath">specify the Image Path</param>   
58.         /// <param name="StoreTextFilePath">Specify the Store Text File</param>   
59.         private static void ReadTextFromImage(String ImagePath, String StoreTextFilePath)   
60.         {   
61.             try  
62.             {   
63.                 // Grab Text From Image   
64.                 MODI.Document ModiObj = new MODI.Document();   
65.                 ModiObj.Create(ImagePath);   
66.                 ModiObj.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);   
67.   
68.                 //Retrieve the text gathered from the image   
69.                 MODI.Image ModiImageObj = (MODI.Image)ModiObj.Images[0];   
70.                   
71.   
72.                 // Store Image Content in Text File   
73.                 FileStream CreateFileObj = new FileStream(StoreTextFilePath, FileMode.Create);   
74.                 //save the image text in the text file    
75.                 StreamWriter WriteFileObj = new StreamWriter(CreateFileObj);   
76.                 WriteFileObj.Write(ModiImageObj.Layout.Text);   
77.                 WriteFileObj.Close();   
78.   
79.                 ModiObj.Close();   
80.             }   
81.             catch (Exception ex)   
82.             {   
83.                 throw new Exception(ex.Message);    
84.             }   
85.         }  
86.  
87.         #endregion   
88.     }   
89. }  

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;


namespace SolReadTextFromImage
{
    class Program
    {
        static void Main(string[] args)
        {
            // Set Sample Image Path
            String ImagePath = AppDomain.CurrentDomain.BaseDirectory + "SampleImage.jpg";

            ReadTextFromImage(ImagePath);

            // Set Store Image Content text file Path
            String StoreTextFilePath = AppDomain.CurrentDomain.BaseDirectory + "SampleText.txt";

            ReadTextFromImage(ImagePath, StoreTextFilePath);
        }

        #region Methods

        /// <summary>
        ///  Read Text from Image and display in console App
        /// </summary>
        /// <param name="ImagePath">specify the Image Path</param>
        private static void ReadTextFromImage(String ImagePath)
        {
            try
            {
                // Grab Text From Image
                MODI.Document ModiObj = new MODI.Document();
                ModiObj.Create(ImagePath);
                ModiObj.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);

                //Retrieve the text gathered from the image
                MODI.Image ModiImageObj = (MODI.Image)ModiObj.Images[0];
               

                System.Console.WriteLine(ModiImageObj.Layout.Text);

                ModiObj.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /// <summary>
        ///  Read Text from Image and Store in Text File
        /// </summary>
        /// <param name="ImagePath">specify the Image Path</param>
        /// <param name="StoreTextFilePath">Specify the Store Text File</param>
        private static void ReadTextFromImage(String ImagePath, String StoreTextFilePath)
        {
            try
            {
                // Grab Text From Image
                MODI.Document ModiObj = new MODI.Document();
                ModiObj.Create(ImagePath);
                ModiObj.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);

                //Retrieve the text gathered from the image
                MODI.Image ModiImageObj = (MODI.Image)ModiObj.Images[0];
               

                // Store Image Content in Text File
                FileStream CreateFileObj = new FileStream(StoreTextFilePath, FileMode.Create);
                //save the image text in the text file 
                StreamWriter WriteFileObj = new StreamWriter(CreateFileObj);
                WriteFileObj.Write(ModiImageObj.Layout.Text);
                WriteFileObj.Close();

                ModiObj.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message); 
            }
        }

        #endregion
    }
}

Output

Click on Image for better View.