Cannot convert from 'system.drawing.bitmap' to 'tesseract.pix'

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Hi

I am trying to get text from image using Tesseract with C# below is the code:

Bitmap img = (Bitmap)Bitmap.FromFile("/Users/prkotagi/Desktop/Test.bmp"); 
TesseractEngine engine = new TesseractEngine("/Volumes/Macintosh HD - Data/Csharpcode/eng.traineddata","eng",EngineMode.Default);
Page page = engine.Process(img, PageSegMode.Auto);
string result = page.GetText();
Console.WriteLine(result);

But we are gerting error as

cannot convert from 'system.drawing.bitmap' to 'tesseract.pix'

at line

Page page = engine.Process(img, PageSegMode.Auto);

What I have tried:

I tried with OCR nothing works. Please let me know the solution for the above one.

Posted 9-Nov-20 22:21pm

Member 14988829

Updated 9-Nov-20 22:44pm

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Richard MacCutchan 10-Nov-20 4:52am

That just means that the Process method expects a tesseract.pix object not a Bitmap.

2 solutions

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Sandeep Mewara · Answer 1 · 2020-11-09T22:44:00

Quote:
cannot convert from 'system.drawing.bitmap' to 'tesseract.pix'

Based on error, seems Process() is expecting parameter of type tesseract.pix and not an bitmap.

Believe there is something like PixConverter[^] that can be used:

C#

using (var img = PixConverter.ToPix(imgsource))
{
    using (var page = engine.Process(img))
    {
        ocrtext = page.GetText();
    }
}

Example reference: tesseract-samples/Program.cs [^]

Alternatively, looking at the demo sample provided, it seems you need to do following:

C#

var tesseractPath = solutionDirectory + @"\tesseract-master.1153";
var imageFile = File.ReadAllBytes(fileName);
var text = ParseText(tesseractPath, imageFile, "eng", "fra");

//results in
Console.WriteLine("File:" + fileName + "\n" + text + "\n");

Reference: GitHub - doxakis/How-to-use-tesseract-ocr-4.0-with-csharp: How to use Tesseract OCR 4.0 with C#[^]

OriginalGriff · Answer 2 · 2020-11-09T22:45:00

Solution 2

You need to convert it to a format that the engine understands. See teh first example here: TesseractEngine.Process C# (CSharp) Code Examples - HotExamples[^]

Posted 9-Nov-20 22:45pm

OriginalGriff