Example





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ResetROI Method (GdPictureOCR)

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Resets the previously specified region of interest, means completely removes the region's data.
Syntax
'Declaration

 


Public Function ResetROI() As GdPictureStatus
public GdPictureStatus ResetROI()
public function ResetROI(): GdPictureStatus; 
public function ResetROI() : GdPictureStatus;
public: GdPictureStatus ResetROI(); 
public:

GdPictureStatus ResetROI();

Return Value

A member of the GdPictureStatus enumeration. If the method has been successfully followed, then the return value is GdPictureStatus.OK.

We strongly recommend always checking this status first.

Example
How to reset the used region of interest. 
Dim caption As String = "Example: ResetROI"

    Using gdpictureOCR As GdPictureOCR = New GdPictureOCR()

        'Set up your prefered parameters for OCR.

        gdpictureOCR.ResourcesFolder = "\GdPicture.Net 14\redist\OCR"

        If gdpictureOCR.AddLanguage(OCRLanguage.English) = GdPictureStatus.OK Then

            'Set up the image you want to process.

            Dim gdpictureImaging As GdPictureImaging = New GdPictureImaging()

            'The standard open file dialog displays to allow you to select the file.

            Dim image As Integer = gdpictureImaging.TiffCreateMultiPageFromFile("")

            If gdpictureImaging.GetStat() = GdPictureStatus.OK Then

                'This example expects that the input tiff file has 2 pages.

                If gdpictureImaging.TiffGetPageCount(image) <> 2 Then

                    MessageBox.Show("This example expects 2 pages tiff files.", caption)

                    Goto [Error]

                End If

 

                'Select the first page.

                If gdpictureImaging.TiffSelectPage(image, 1) <> GdPictureStatus.OK Then

                    MessageBox.Show("The TiffSelectPage() method has failed with the status: " + gdpictureImaging.GetStat().ToString(), caption)

                    Goto [Error]

                 End If

            

                'Set the image. This step is mandatory.

                gdpictureOCR.SetImage(image)

                If gdpictureOCR.GetStat() <> GdPictureStatus.OK Then

                    MessageBox.Show("The SetImage() method has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption)

                    GoTo [error]

                End If

 

                'Define the required ROI.

                gdpictureOCR.SetROI(100, 100, 200, 50)

                'Define the character set for phone numbers.

                gdpictureOCR.CharacterSet = "0123456789"

                'Run the OCR process.

                gdpictureOCR.RunOCR("PhoneNumberRegion")

                If gdpictureOCR.GetStat() <> GdPictureStatus.OK Then

                    MessageBox.Show("The OCR process has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption)

                    Goto [Error]

                End If

 

                'Reset the required ROI.

                gdpictureOCR.SetROI(150, 300, 200, 200)

                'Define the character set for addresses.

                gdpictureOCR.CharacterSet = ""

                gdpictureOCR.Context = OCRContext.OCRContextSingleBlock

                'Run the OCR process.

                gdpictureOCR.RunOCR("AddressRegion")

                If gdpictureOCR.GetStat() <> GdPictureStatus.OK Then

                    MessageBox.Show("The OCR process has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption)

                    Goto [Error]

                End If

 

                'Analyze your OCR results using the identifiers "PhoneNumberRegion" And "AddressRegion".

                'Continue ...

 

                'Prepare GdPictureOCR for the next process.

 

                'Release unused results for better memory management.

                gdpictureOCR.ReleaseOCRResults()

                'Reset region of interest to the whole page.

                gdpictureOCR.ResetROI()

                gdpictureOCR.Context = OCRContext.OCRContextDocument

 

                'Select the second page.

                gdpictureImaging.ReleaseGdPictureImage(image)

                If gdpictureImaging.TiffSelectPage(image, 2) <> GdPictureStatus.OK Then

                    MessageBox.Show("The TiffSelectPage() method has failed with the status: " + gdpictureImaging.GetStat().ToString(), caption)

                    Goto [Error]

                End If

                

                'Set another image.

                gdpictureOCR.SetImage(image)

                If gdpictureOCR.GetStat() <> GdPictureStatus.OK Then

                    MessageBox.Show("The SetImage() method has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption)

                    GoTo [error]

                End If

 

                'Run the OCR process.

                Dim pageText As String = gdpictureOCR.RunOCR()

                If gdpictureOCR.GetStat() <> GdPictureStatus.OK Then

                    MessageBox.Show("The OCR process has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption)

                    Goto [Error]

                End If

 

                Dim text As String = gdpictureOCR.GetOCRResultText(pageText)

                If gdpictureOCR.GetStat() = GdPictureStatus.OK Then

                    MessageBox.Show("The text on the page is : " + vbCrLf + text, caption)

                Else

                    MessageBox.Show("The GetOCRResultText() method has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption)

                End If

 

[error]:

                gdpictureImaging.ReleaseGdPictureImage(image)

            Else

                MessageBox.Show("The error occurred when setting up the image: " + gdpictureImaging.GetStat().ToString() + " or " + gdpictureOCR.GetStat().ToString(), caption)

            End If

            gdpictureImaging.Dispose()

        Else

            MessageBox.Show("The AddLanguage() method has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption)

        End If

        gdpictureOCR.ReleaseOCRResults()

    End Using
string caption = "Example: ResetROI";

using (GdPictureOCR gdpictureOCR = new GdPictureOCR())

{

    //Set up your prefered parameters for OCR.

    gdpictureOCR.ResourcesFolder = "\\GdPicture.Net 14\\redist\\OCR";

    if (gdpictureOCR.AddLanguage(OCRLanguage.English) == GdPictureStatus.OK)

    {

        //Set up the image you want to process.

        GdPictureImaging gdpictureImaging = new GdPictureImaging();

        //The standard open file dialog displays to allow you to select the file.

        int image = gdpictureImaging.TiffCreateMultiPageFromFile("");

        if (gdpictureImaging.GetStat() == GdPictureStatus.OK)

        {

            //This example expects that the input tiff file has 2 pages.

            if (gdpictureImaging.TiffGetPageCount(image) != 2)

            {

                MessageBox.Show("This example expects 2 pages tiff files.", caption);

                goto error;

            }

 

            //Select the first page.

            if (gdpictureImaging.TiffSelectPage(image, 1) != GdPictureStatus.OK)

            {

                MessageBox.Show("The TiffSelectPage() method has failed with the status: " + gdpictureImaging.GetStat().ToString(), caption);

                goto error;

            }

            

            //Set the image. This step is mandatory.

            gdpictureOCR.SetImage(image);

            if (gdpictureOCR.GetStat() != GdPictureStatus.OK)

            {

                MessageBox.Show("The SetImage() method has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption);

                goto error;

            }

             

            //Define the required ROI.

            gdpictureOCR.SetROI(100, 100, 200, 50);

            //Define the character set for phone numbers.

            gdpictureOCR.CharacterSet = "0123456789";

 

            //Run the OCR process.

            gdpictureOCR.RunOCR("PhoneNumberRegion");

            if (gdpictureOCR.GetStat() != GdPictureStatus.OK)

            {

                MessageBox.Show("The OCR process has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption);

                goto error;

            }

 

            //Reset the required ROI.

            gdpictureOCR.SetROI(150, 300, 200, 200);

            //Define the character set for addresses.

            gdpictureOCR.CharacterSet = "";

            gdpictureOCR.Context = OCRContext.OCRContextSingleBlock;

 

            //Run the OCR process.

            gdpictureOCR.RunOCR("AddressRegion");

            if (gdpictureOCR.GetStat() != GdPictureStatus.OK)

            {

                MessageBox.Show("The OCR process has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption);

                goto error;

            }

 

            //Analyze your OCR results using the identifiers "PhoneNumberRegion" and "AddressRegion".

            //Continue ...

 

            //Prepare GdPictureOCR for the next process.

 

            //Releasing unused results for better memory management.

            gdpictureOCR.ReleaseOCRResults();

 

            //Reset region of interest to the whole page.

            gdpictureOCR.ResetROI();

            gdpictureOCR.Context = OCRContext.OCRContextDocument;

 

            //Select the second page.

            gdpictureImaging.ReleaseGdPictureImage(image);

            if (gdpictureImaging.TiffSelectPage(image, 2) != GdPictureStatus.OK)

            {

                MessageBox.Show("The TiffSelectPage() method has failed with the status: " + gdpictureImaging.GetStat().ToString(), caption);

                goto error;

            }

            

            //Set another image.

            gdpictureOCR.SetImage(image);

            if (gdpictureOCR.GetStat() != GdPictureStatus.OK)

            {

                MessageBox.Show("The SetImage() method has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption);

                goto error;

            }

 

            //Run the OCR process.

            string pageText = gdpictureOCR.RunOCR();

            if (gdpictureOCR.GetStat() != GdPictureStatus.OK)

            {

                MessageBox.Show("The OCR process has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption);

                goto error;

            }

            string text = gdpictureOCR.GetOCRResultText(pageText);

            if (gdpictureOCR.GetStat() == GdPictureStatus.OK)

            {

                MessageBox.Show("The text on the page is : \n" + text, caption);

            }

            else

            {

                MessageBox.Show("The GetOCRResultText() method has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption);

            }

 

        error:

            //Release the used image.

            gdpictureImaging.ReleaseGdPictureImage(image);

        }

        else

            MessageBox.Show("The error occurred when setting up the image: " + gdpictureImaging.GetStat().ToString() + " or " + gdpictureOCR.GetStat().ToString(), caption);

        gdpictureImaging.Dispose();

    }

    else

        MessageBox.Show("The AddLanguage() method has failed with the status: " + gdpictureOCR.GetStat().ToString(), caption);

    gdpictureOCR.ReleaseOCRResults();

}
See Also

Reference

GdPictureOCR Class
GdPictureOCR Members
SetROI Method
RunOCR Method
OCRContext Enumeration