Tesseract usage in C#

ambrish dhaka

I am a beginner in C#. I am trying to use tesseract.exe located as an independent application in Program files, which I have installed as a separate program. I want to use this .exe file to read clipboard image and then store the output in a windows form. All this needs to be done with a button click. My code is as follows:

private void B8_Click(object sender, EventArgs e)
{
string ts = "C:\\Program Files (x86)\\Tesseract-OCR\\tesseract.exe";
m = Clipboard.GetImage();
string lang = "eng";
if (m != null)
{
Process w = new Process();
w.StartInfo.UseShellExecute = false;
w.StartInfo.FileName = ts;
w.StartInfo.Arguments = string.Format("\"{0}\" \"{1}\" -l {2}", m, v, lang);
w.Start();
w.Close();
tb5.AppendText(v + Environment.NewLine);
Clipboard.Clear();
m = null;
v = null;
}
else
{
MessageBox.Show("No Image.");
}

This gives nothing in textbox. Thanks in advance.

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

Kip Hackman6y ago
You can use LEADTOOLS Recognition SDK technology in your application.

https://www.leadtools.com/sdk/recognition-imaging

The Recognition SDK technology allows you to recognize and extarct text from documents and images.

Here is some sample code:
// Create an instance of the engine
using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD, false))
{
    // Start the engine using default parameters
    ocrEngine.Startup(null, null, null, LEAD_VARS.OcrLEADRuntimeDir);

    string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif");
    string pdfFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.pdf");

    // Create an OCR document
    using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument())
    {
        // Add a page to the document
        IOcrPage ocrPage = ocrDocument.Pages.AddPage(tifFileName, null);

        // Recognize the page
        ocrPage.AutoZone(null);
        ocrPage.Recognize(null);

        // Save the document we have as PDF
        ocrDocument.Save(pdfFileName, DocumentFormat.Pdf, null);
    }
    ocrEngine.Shutdown();
}
Bidyasagar Mishra7y ago
first declare the 'v'.
James Axsom7y ago
Examing your code at face value without knowing what you have coded in addition to what you are showing us there are couple things that strike me as odd.

The variable v is not declared and doesn't have a type. This should throw a runtime error.
The variable v won't put a value in the textbox because its by value parameter as opposed to be a by reference parameter.

If v were a by reference parameter then any changes to v while inside string.Format would show up in your texbox. Unforunately you have no control to force the parameter in string.Format to be by reference because Microsoft designed it to be by value parameter.

So where are you declaring variables: m and v and what types they?
Željko Perić7y ago
Hello, https://www.c-sharpcorner.com/members/ambrish-dhaka

I think that there is error in line 11 in above program code.

Try this link

https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.processstartinfo.arguments?view=netframework-4.8

Are variables m, v type of string ?

All the best,
Peric Željko
Amit Gupta7y ago
Have you gone through the correct command line? Check this out

https://stackoverflow.com/questions/26251599/can-i-test-tesseract-ocr-in-windows-command-line