PdfFocusCOCROptions Class

public class COCROptions

Public Class COCROptions

using System.IO;
using SautinSoft;
using System;

namespace Example
{
    class Program
    {
        static void Main(string[] args)
        {
            // Note: Please rebuild the project to restore Nuget packages.

            LoadScannedPdf();
        }

        /// <summary>
        /// Load a scanned PDF document with help of Tesseract OCR (free OCR library) and save the result as DOCX document.
        /// </summary>
        static void LoadScannedPdf()
        {
            // Here we'll load a scanned PDF document (perform OCR) containing a text on English, Russian and Vietnamese.
            // Next save the OCR result as a new DOCX document.

            // First steps:

            // 1. Download data files for English, Russian and Vietnamese languages.
            // Please download the files: eng.traineddata, rus.traineddata and vie.traineddata.
            // From here (good and fast): https://github.com/tesseract-ocr/tessdata_fast
            // or (best and slow): https://github.com/tesseract-ocr/tessdata_best

            // 2. Copy the files: eng.traineddata, rus.traineddata and vie.traineddata to
            // the folder "tessdata" in the Project root.

            // 3. Be sure that the folder "tessdata" also contains "pdf.ttf" file.

            // Let's start:
            string inpFile = @"..\..\scan.pdf";
            string outFile = "Result.docx";

            PdfFocus f = new PdfFocus();
            f.OCROptions.Mode = PdfFocus.COCROptions.eOCRMode.AllImages;
            f.OCROptions.Method += PerformOCRTesseract;

            f.OpenPdf(inpFile);
            bool result = false;
            if (f.PageCount > 0)
            {
                result = f.ToWord(outFile) == 0;
            }
            // Open the result for demonstration purposes.
            if (result)
            {                
                System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile) { UseShellExecute = true });
            }
            else
                Console.WriteLine("Conversion failed!");
        }
        public static byte[] PerformOCRTesseract(byte[] image)
        {
            // Specify that Tesseract use three 3 languages: English, Russian and Vietnamese.
            //string tesseractLanguages = "rus+eng+vie";
            string tesseractLanguages = "eng";

            // A path to a folder which contains languages data files and font file "pdf.ttf".
            // Language data files can be found here:
            // Good and fast: https://github.com/tesseract-ocr/tessdata_fast
            // or
            // Best and slow: https://github.com/tesseract-ocr/tessdata_best
            // Also this folder must have write permissions.
            string tesseractData = Path.GetFullPath(@"..\..\tessdata\");

            // A path for a temporary PDF file (because Tesseract returns OCR result as PDF document)
            string tempFile = Path.Combine(tesseractData, Path.GetRandomFileName());

            bool skipImages = true;

            try
            {
                using (Tesseract.IResultRenderer renderer = Tesseract.PdfResultRenderer.CreatePdfRenderer(tempFile, tesseractData, skipImages))
                {
                    using (renderer.BeginDocument("Serachablepdf"))
                    {
                        using (Tesseract.TesseractEngine engine = new Tesseract.TesseractEngine(tesseractData, tesseractLanguages, Tesseract.EngineMode.Default))
                        {
                            engine.DefaultPageSegMode = Tesseract.PageSegMode.Auto;
                            using (MemoryStream msImg = new MemoryStream(image))
                            {
                                System.Drawing.Image imgWithText = System.Drawing.Image.FromStream(msImg);
                                for (int i = 0; i < imgWithText.GetFrameCount(System.Drawing.Imaging.FrameDimension.Page); i++)
                                {
                                    imgWithText.SelectActiveFrame(System.Drawing.Imaging.FrameDimension.Page, i);
                                    using (MemoryStream ms = new MemoryStream())
                                    {
                                        imgWithText.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                                        byte[] imgBytes = ms.ToArray();
                                        using (Tesseract.Pix img = Tesseract.Pix.LoadFromMemory(imgBytes))
                                        {
                                            using (var page = engine.Process(img, "Serachablepdf"))
                                            {
                                                renderer.AddPage(page);
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                return File.ReadAllBytes(tempFile + ".pdf");
            }
            catch (Exception e)
            {
                Console.WriteLine();
                Console.WriteLine("Please be sure that you have Language data files (*.traineddata) in your folder \"tessdata\"");
                Console.WriteLine("The Language data files can be download from here: https://github.com/tesseract-ocr/tessdata_fast");
                Console.ReadKey();
                throw new Exception("Error Tesseract: " + e.Message);
            }
            finally
            {
                if (File.Exists(tempFile + ".pdf"))
                    File.Delete(tempFile + ".pdf");
            }
        }

    }
}

Option Infer On

Imports System.IO
Imports SautinSoft
Imports System

Namespace Example
    Friend Class Program
        Shared Sub Main(ByVal args() As String)
            ' Note: Please rebuild the project to restore Nuget packages.

            LoadScannedPdf()
        End Sub

        ''' <summary>
        ''' Load a scanned PDF document with help of Tesseract OCR (free OCR library) and save the result as DOCX document.
        ''' </summary>
        Private Shared Sub LoadScannedPdf()
            ' Here we'll load a scanned PDF document (perform OCR) containing a text on English, Russian and Vietnamese.
            ' Next save the OCR result as a new DOCX document.

            ' First steps:

            ' 1. Download data files for English, Russian and Vietnamese languages.
            ' Please download the files: eng.traineddata, rus.traineddata and vie.traineddata.
            ' From here (good and fast): https://github.com/tesseract-ocr/tessdata_fast
            ' or (best and slow): https://github.com/tesseract-ocr/tessdata_best

            ' 2. Copy the files: eng.traineddata, rus.traineddata and vie.traineddata to
            ' the folder "tessdata" in the Project root.

            ' 3. Be sure that the folder "tessdata" also contains "pdf.ttf" file.

            ' Let's start:
            Dim inpFile As String = "..\scan.pdf"
            Dim outFile As String = "Result.docx"

            Dim f As New PdfFocus()
            f.OCROptions.Mode = PdfFocus.COCROptions.eOCRMode.AllImages
            f.OCROptions.Method = AddressOf PerformOCRTesseract

            f.OpenPdf(inpFile)
            Dim result As Boolean = False
            If f.PageCount > 0 Then
                result = f.ToWord(outFile) = 0
            End If
            ' Open the result for demonstration purposes.
            If result Then
                System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(outFile) With {.UseShellExecute = True})
            Else
                Console.WriteLine("Conversion failed!")
            End If
        End Sub
        Public Shared Function PerformOCRTesseract(ByVal image() As Byte) As Byte()
            ' Specify that Tesseract use three 3 languages: English, Russian and Vietnamese.
            'string tesseractLanguages = "rus+eng+vie";
            Dim tesseractLanguages As String = "eng"

            ' A path to a folder which contains languages data files and font file "pdf.ttf".
            ' Language data files can be found here:
            ' Good and fast: https://github.com/tesseract-ocr/tessdata_fast
            ' or
            ' Best and slow: https://github.com/tesseract-ocr/tessdata_best
            ' Also this folder must have write permissions.
            Dim tesseractData As String = Path.GetFullPath("..\tessdata\")

            ' A path for a temporary PDF file (because Tesseract returns OCR result as PDF document)
            Dim tempFile As String = Path.Combine(tesseractData, Path.GetRandomFileName())

            Dim skipImages As Boolean = True

            Try
                Using renderer As Tesseract.IResultRenderer = Tesseract.PdfResultRenderer.CreatePdfRenderer(tempFile, tesseractData, skipImages)
                    Using renderer.BeginDocument("Serachablepdf")
                        Using engine As New Tesseract.TesseractEngine(tesseractData, tesseractLanguages, Tesseract.EngineMode.Default)
                            engine.DefaultPageSegMode = Tesseract.PageSegMode.Auto
                            Using msImg As New MemoryStream(image)
                                Dim imgWithText As System.Drawing.Image = System.Drawing.Image.FromStream(msImg)
                                Dim i As Integer = 0
                                Do While i < imgWithText.GetFrameCount(System.Drawing.Imaging.FrameDimension.Page)
                                    imgWithText.SelectActiveFrame(System.Drawing.Imaging.FrameDimension.Page, i)
                                    Using ms As New MemoryStream()
                                        imgWithText.Save(ms, System.Drawing.Imaging.ImageFormat.Png)
                                        Dim imgBytes() As Byte = ms.ToArray()
                                        Using img As Tesseract.Pix = Tesseract.Pix.LoadFromMemory(imgBytes)
                                            Using page = engine.Process(img, "Serachablepdf")
                                                renderer.AddPage(page)
                                            End Using
                                        End Using
                                    End Using
                                    i += 1
                                Loop
                            End Using
                        End Using
                    End Using
                End Using

                Return File.ReadAllBytes(tempFile & ".pdf")
            Catch e As Exception
                Console.WriteLine()
                Console.WriteLine("Please be sure that you have Language data files (*.traineddata) in your folder ""tessdata""")
                Console.WriteLine("The Language data files can be download from here: https://github.com/tesseract-ocr/tessdata_fast")
                Console.ReadKey()
                Throw New Exception("Error Tesseract: " & e.Message)
            Finally
                If File.Exists(tempFile & ".pdf") Then
                    File.Delete(tempFile & ".pdf")
                End If
            End Try
        End Function
    End Class
End Namespace