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Programming / Document Cleanup / Connected characters and oversampled characters

Connected characters and oversampled characters

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Sometimes characters in documents appear thick and their features unclear, like if there was too much ink while printing them. This is usually the result of repeated scanning and printing of the document, especially using the low setting such as DPI. Erosion can help fix this issue.

Before / After

Here is the code example how it works.

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

Dim oGdPictureImaging As New GdPictureImaging()

'Loading the image from a file.

Dim imageId As Integer = oGdPictureImaging.CreateGdPictureImageFromFile("input.tif")

'Checking if the image resource has been loaded correctly.

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

    MessageBox.Show("The image can't be loaded. Error: " + oGdPictureImaging.GetStat().ToString(), "Document Cleanup Example", MessageBoxButtons.OK, MessageBoxIcon.Error)

Else

    'Now you can erode the black content of your image.

    Dim status As GdPictureStatus = oGdPictureImaging.FxBitonalErode8(imageId)

    If status <> GdPictureStatus.OK Then

        MessageBox.Show("Error: " + oGdPictureImaging.GetStat().ToString(), "Document Cleanup Example", MessageBoxButtons.OK, MessageBoxIcon.Error)

    Else

        'After you are done with your processing, you can save the image.

        status = oGdPictureImaging.SaveAsTIFF(imageId, "Eroded_Image.tif", TiffCompression.TiffCompressionAUTO)

        If status <> GdPictureStatus.OK Then

            MessageBox.Show("Error: " + oGdPictureImaging.GetStat().ToString(), "Document Cleanup Example", MessageBoxButtons.OK, MessageBoxIcon.Error)

        End If

    End If

    oGdPictureImaging.ReleaseGdPictureImage(imageId)

End If

oGdPictureImaging.Dispose()
Copy Code 
//We assume that GdPicture has been correctly installed and unlocked.

GdPictureImaging oGdPictureImaging = new GdPictureImaging();

//Loading the image from a file.

int imageId = oGdPictureImaging.CreateGdPictureImageFromFile("input.tif");

//Checking if the image resource has been loaded correctly.

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

{

    MessageBox.Show("The image can't be loaded. Error: " + oGdPictureImaging.GetStat().ToString(), "Document Cleanup Example", MessageBoxButtons.OK, MessageBoxIcon.Error);

}

else

{

    //Now you can erode the black content of your image.

    GdPictureStatus status = oGdPictureImaging.FxBitonalErode8(imageId);

    if (status != GdPictureStatus.OK)

    {

        MessageBox.Show("Error: " + oGdPictureImaging.GetStat().ToString(), "Document Cleanup Example", MessageBoxButtons.OK, MessageBoxIcon.Error);

    }

    else

    {

        //After you are done with your processing, you can save the image.

        status = oGdPictureImaging.SaveAsTIFF(imageId, "Eroded_Image.tif", TiffCompression.TiffCompressionAUTO);

        if (status != GdPictureStatus.OK)

        {

            MessageBox.Show("Error: " + oGdPictureImaging.GetStat().ToString(), "Document Cleanup Example", MessageBoxButtons.OK, MessageBoxIcon.Error);

        }

    }

    oGdPictureImaging.ReleaseGdPictureImage(imageId);

}

oGdPictureImaging.Dispose();