OCR Tesseract Image DPI

The OcrInput class will automatically resolve low-resolution images for IronTesseract.

Although Tesseract generally requires a 300 DPI input, IronTesseract has been tuned to work with 99+% accuracy on 225 DPI scans. This can double OCR speed.

Too high a DPI is slow. Too low a DPI causes inaccuracies. If in doubt, do nothing, and Iron Tesseract will preconfigure everything for you.

// Import the IronOcr namespace
using IronOcr;

class Program
{
    static void Main()
    {
        // Construct an IronTesseract instance
        var Ocr = new IronTesseract();

        // Create an OcrInput object and provide the path to the image file
        using (var Input = new OcrInput(@"path\to\your\low-resolution-image.png"))
        {
            // Optionally, set the DPI (Dots Per Inch) if you need to adjust for specific image resolutions.
            // OcrInput will handle low-resolution images automatically, so this step can often be skipped.
            Input.TargetDPI = 300;

            // Perform OCR on the input image, recognizing text
            var Result = Ocr.Read(Input);

            // Output the recognized text to the console
            Console.WriteLine(Result.Text);
        }
    }
}

// Import the IronOcr namespace
using IronOcr;

class Program
{
    static void Main()
    {
        // Construct an IronTesseract instance
        var Ocr = new IronTesseract();

        // Create an OcrInput object and provide the path to the image file
        using (var Input = new OcrInput(@"path\to\your\low-resolution-image.png"))
        {
            // Optionally, set the DPI (Dots Per Inch) if you need to adjust for specific image resolutions.
            // OcrInput will handle low-resolution images automatically, so this step can often be skipped.
            Input.TargetDPI = 300;

            // Perform OCR on the input image, recognizing text
            var Result = Ocr.Read(Input);

            // Output the recognized text to the console
            Console.WriteLine(Result.Text);
        }
    }
}

' Import the IronOcr namespace
Imports IronOcr

Friend Class Program
	Shared Sub Main()
		' Construct an IronTesseract instance
		Dim Ocr = New IronTesseract()

		' Create an OcrInput object and provide the path to the image file
		Using Input = New OcrInput("path\to\your\low-resolution-image.png")
			' Optionally, set the DPI (Dots Per Inch) if you need to adjust for specific image resolutions.
			' OcrInput will handle low-resolution images automatically, so this step can often be skipped.
			Input.TargetDPI = 300

			' Perform OCR on the input image, recognizing text
			Dim Result = Ocr.Read(Input)

			' Output the recognized text to the console
			Console.WriteLine(Result.Text)
		End Using
	End Sub
End Class

In the provided C# code:

• We begin by importing the IronOcr library, which is necessary for using its OCR functionalities.
• We instantiate IronTesseract to process our images.
• We then create an OcrInput object with a file path to our low-resolution image.
• Optionally, the TargetDPI property can be set to adjust the image DPI if necessary. However, IronTesseract is capable of handling low DPI on its own.
• Finally, we call the Read method on the Ocr object, which processes the input image and extracts the text. The recognized text is output to the console.