public RasterImage ExportPage(
int pageIndex
)
Overloads Function ExportPage( _
ByVal pageIndex As Integer _
) As RasterImage
- (nullable LTRasterImage *)exportPageAtIndex:(NSUInteger)pageIndex
error:(NSError **)error
RasterImage^ ExportPage(
int pageIndex
)
pageIndex
The zero-based index of the page to export.
A RasterImage object containing a copy of the image data of the specified page.
This method copies the image data to the created RasterImage object image. Therefore, after this method returns, there is no relationship between the returned value and the IOcrPage inside the OCR document. The returned RasterImage object will need to be disposed.
To export more than one page to a multipage RasterImage object, use ExportPages(int firstPageIndex, int lastPageIndex).
This method is identical to calling IOcrPage.GetRasterImage() on the page whose index is at pageIndex.
This member only works with memory-based documents and will throw an exception otherwise. For more information, refer to IOcrDocumentManager.CreateDocument and Programming with the LEADTOOLS .NET OCR.
This example will add a page to an OCR document before exporting it back and saving it to disk
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Ocr;
using Leadtools.Document.Writer;
using Leadtools.Forms.Common;
using Leadtools.ImageProcessing.Core;
public void ExportPageToRasterImageExample()
{
string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif");
string exportedFileName = Path.Combine(LEAD_VARS.ImagesDir, "OcrExported.jpg");
RasterCodecs codecs = new RasterCodecs();
// Create an instance of the engine
using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD, false))
{
// Since we have a RasterCodecs object, re-use it in the OCR engine. Although
// this demo will not use it, it is always a good practice
ocrEngine.Startup(codecs, null, null, LEAD_VARS.OcrLEADRuntimeDir);
// Create an OCR document
using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument())
{
// Add the image to the document
ocrDocument.Pages.AddPage(tifFileName, null);
// Export it back as a RasterImage
RasterImage image = ocrDocument.Pages.ExportPage(0);
// Save this image to disk
codecs.Save(image, exportedFileName, RasterImageFormat.Jpeg, 0);
// We need to dispose the image ourselves
image.Dispose();
}
// Shutdown the engine
// Note: calling Dispose will also automatically shutdown the engine if it has been started
ocrEngine.Shutdown();
}
codecs.Dispose();
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
public const string OcrLEADRuntimeDir = @"C:\LEADTOOLS 20\Bin\Common\OcrLEADRuntime";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Ocr
Imports Leadtools.Document.Writer
Imports Leadtools.Forms
Imports Leadtools.ImageProcessing.Core
Public Sub ExportPageToRasterImageExample()
Dim tifFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif")
Dim exportedFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "OcrExported.jpg")
Dim codecs As New RasterCodecs()
' Create an instance of the engine
Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD, False)
' Since we have a RasterCodecs object, re-use it in the OCR engine. Although
' this demo will not use it, it is always a good practice
ocrEngine.Startup(codecs, Nothing, Nothing, LEAD_VARS.OcrLEADRuntimeDir)
' Create an OCR document
Using ocrDocument As IOcrDocument = ocrEngine.DocumentManager.CreateDocument()
' Add the image to the document
ocrDocument.Pages.AddPage(tifFileName, Nothing)
' Export it back as a RasterImage
Dim image As RasterImage = ocrDocument.Pages.ExportPage(0)
' Save this image to disk
codecs.Save(image, exportedFileName, RasterImageFormat.Jpeg, 0)
' We need to dispose the image ourselves
image.Dispose()
End Using
' Shutdown the engine
' Note: calling Dispose will also automatically shutdown the engine if it has been started
ocrEngine.Shutdown()
End Using
codecs.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
Public Const OcrLEADRuntimeDir As String = "C:\LEADTOOLS 20\Bin\Common\OcrLEADRuntime"
End Class
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