how to train tesseract?

[Cenk KIZILDAĞ]

Hi,

I would like to recognize only digits with the code sample below:

try

            {

               

 

             System.Drawing.Bitmap imagee=new Bitmap(pictureBox1.Image);

             System.Drawing.Bitmap imagee2=AForge.Imaging.Image.Clone(imagee,System.Drawing.Imaging.PixelFormat.Format24bppRgb);

             //GET IMAGE FROM FILE

 

             //CONVERT IMAGE TO TEXT

             tessnet2.Tesseract ocr = new tessnet2.Tesseract(); 

             ocr.SetVariable("tessedit_char_whitelist", "0123456789");

             ocr.Init(@"C:\Users\197199\Documents\Visual Studio 2013\Projects\OCR\OCR\bin\Debug\tessdata", "eng", true); 

              List<tessnet2.Word> res=ocr.DoOCR(imagee2,Rectangle.Empty);

 

             foreach(tessnet2.Word word in res)

             {

             textBox1.Text=textBox1.Text+word.Text+Environment.NewLine;

             }

             //CONVERT IMAGE TO TEXT

            }

            catch( Exception ex)

            {

                textBox1.Text = ex.Message;

            }

Here is the image that I would like to recognize:

And the outcome is:

88

12

18

28

41

48

How can I fix this? Any help please.

Thanks in advance & Best Regards.

[Dmitri Silaev]

As the first mandatory step you need to do perspective correction, e.g. using paper sheet boundaries (is it a lottery ticket?)

Then depending on how it goes further with Tesseract you may need either to:

- Train for this particular font

- Blur a bit to make characters more "fleshy"

- Scale down vertically by a factor of 1.5 to match closer to standard trained fonts

Each step in turn is a multi-step process. PM me if you're interested.

Best regards,
Dmitri Silaev
www.CustomOCR.com

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[Cenk KIZILDAĞ]

Hi Dmitri,

Thanks for your reply. I need your asistance. Would you please help me?

Thanks in advance & Best Regards.

29 Haziran 2015 Pazartesi 23:39:33 UTC+3 tarihinde Dmitri Silaev yazdı:

[Dmitri Silaev]

Hi Cenk,

Sure, do not hesitate to contact me directly.

-Dmitri

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