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Programming / OCR / How to automatically rotate pages of a multipage TIFF file using OCR

How to automatically rotate pages of a multipage TIFF file using OCR

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This is how to automatically rotate pages of a multipage TIFF file with help of OCR Tesseract engine method. After the successful rotation of all pages the source file is saved to the destination file.

Copy Code 
'We assume that GdPicture has been correctly installed and unlocked.

Dim filepath As String = "multipage.tif"

Dim destpath As String = "output.tif"

'Specify your path.

Dim DICT_PATH As String = "C:\GdPicture.NET 14\Redist\OCR"

'Specify your language.

Dim LANG As OCRLanguage = OCRLanguage.English



Dim status As GdPictureStatus

Using gdpictureImaging As New GdPictureImaging()

    Dim hasRotation As Boolean = False

    Dim imageID As Integer = gdpictureImaging.CreateGdPictureImageFromFile(filepath)

    status = gdpictureImaging.GetStat()

    If status = GdPictureStatus.OK Then

        Dim pageCount As Integer = gdpictureImaging.GetPageCount(imageID)

        For i As Integer = 1 To pageCount

            status = gdpictureImaging.SelectPage(imageID, i)

            If status = GdPictureStatus.OK Then

                Using gdpictureOCR As GdPictureOCR = New GdPictureOCR()

                    gdpictureOCR.ResourceFolder = DICT_PATH

                    gdpictureOCR.AddLanguage(LANG)

                    status = gdpictureOCR.SetImage(imageID)

                    Dim pageRotation As Integer = gdpictureOCR.GetOrientation()

                    If pageRotation <> 0 Then

                        hasRotation = True

                        status = gdpictureImaging.RotateAngle(imageID, 360 - pageRotation)

                    End If

                End Using

            End If

            If status <> GdPictureStatus.OK Then

                MessageBox.Show("Error: " + status, "Rotation + OCR Example", MessageBoxButtons.OK, MessageBoxIcon.Error)

                Exit For

            End If

        Next

        If status = GdPictureStatus.OK Then

            If hasRotation Then

                status = gdpictureImaging.TiffSaveMultiPageToFile(imageID, destpath, TiffCompression.TiffCompressionAUTO)

                If status = GdPictureStatus.OK Then

                    MessageBox.Show("Done!", "Rotation + OCR Example", MessageBoxButtons.OK, MessageBoxIcon.Information)

                Else

                    MessageBox.Show("Error: " + status, "Rotation + OCR Example", MessageBoxButtons.OK, MessageBoxIcon.Error)

                End If

            Else

                System.IO.File.Copy(filepath, destpath)

            End If

        End If

        gdpictureImaging.ReleaseGdPictureImage(imageID)

    End If

End Using
Copy Code 
//We assume that GdPicture has been correctly installed and unlocked.

string filepath = "multipage.tif";

string destpath = "output.tif";

string DICT_PATH = "C:\\GdPicture.NET 14\\Redist\\OCR"; //Specify your path.

OCRLanguage LANG = OCRLanguage.English; //Specify your language.



GdPictureStatus status;

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())

{

    bool hasRotation = false;

    int imageID = gdpictureImaging.CreateGdPictureImageFromFile(filepath);

    status = gdpictureImaging.GetStat();

    if (status == GdPictureStatus.OK)

    {

        int pageCount = gdpictureImaging.GetPageCount(imageID);

        for (int i = 1; i <= pageCount; i++)

        {

            status = gdpictureImaging.SelectPage(imageID, i);

            if (status == GdPictureStatus.OK)

            {

                using (GdPictureOCR gdpictureOCR = new GdPictureOCR())

                {

                    gdpictureOCR.ResourceFolder = DICT_PATH;

                    gdpictureOCR.AddLanguage(LANG);

                    status = gdpictureOCR.SetImage(imageID);

                    int pageRotation = gdpictureOCR.GetOrientation();

                    if (pageRotation != 0)

                    {

                        hasRotation = true;

                        status = gdpictureImaging.RotateAngle(imageID, 360 - pageRotation);

                    }

                }

            }

            if (status != GdPictureStatus.OK)

            {

                MessageBox.Show("Error: " + status, "Rotation + OCR Example", MessageBoxButtons.OK, MessageBoxIcon.Error);

                break;

            }

        }

        if (status == GdPictureStatus.OK)

        {

            if (hasRotation)

            {

                status = gdpictureImaging.TiffSaveMultiPageToFile(imageID, destpath, TiffCompression.TiffCompressionAUTO);

                if (status == GdPictureStatus.OK)

                    MessageBox.Show("Done!", "Rotation + OCR Example", MessageBoxButtons.OK, MessageBoxIcon.Information);

                else

                    MessageBox.Show("Error: " + status, "Rotation + OCR Example", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }

            else

            {

                System.IO.File.Copy(filepath, destpath);

            }

        }

        gdpictureImaging.ReleaseGdPictureImage(imageID);

    }

}