Leadtools.Forms.Ocr Namespace > IOcrPageCollection Interface > AddPages Method : AddPages(RasterImage,Int32,Int32,OcrProgressCallback) Method |
void AddPages( RasterImage image, int imageFirstPageNumber, int imageLastPageNumber, OcrProgressCallback callback )
'Declaration Overloads Sub AddPages( _ ByVal image As RasterImage, _ ByVal imageFirstPageNumber As Integer, _ ByVal imageLastPageNumber As Integer, _ ByVal callback As OcrProgressCallback _ )
'Usage Dim instance As IOcrPageCollection Dim image As RasterImage Dim imageFirstPageNumber As Integer Dim imageLastPageNumber As Integer Dim callback As OcrProgressCallback instance.AddPages(image, imageFirstPageNumber, imageLastPageNumber, callback)
void AddPages( RasterImage image, int imageFirstPageNumber, int imageLastPageNumber, OcrProgressCallback callback )
- (BOOL)addPagesWithImage:(LTRasterImage*)image imageFirstPageNumber:(int)imageFirstPageNumber imageLastPageNumber:(int)imageLastPageNumber target:(id)target selector:(SEL)selector error:(NSError**)outError;
public void addPages(RasterImage image, int imageFirstPageNumber, int imageLastPageNumber, OcrProgressListener callback)
function Leadtools.Forms.Ocr.IOcrPageCollection.AddPages(RasterImage,Int32,Int32,OcrProgressCallback)( image , imageFirstPageNumber , imageLastPageNumber , callback )
void AddPages( RasterImage^ image, int imageFirstPageNumber, int imageLastPageNumber, OcrProgressCallback^ callback )
This method copies the Leadtools.RasterImage object image data into the newly created IOcrPage. Therefore, after this method returns, there is no relationship between image and the IOcrPage inside the OCR document. For example, if you do not need the image object after calling this method, you should dispose it after this method returns.
This method guarantees that no changes will be made to image.
A short-cut to add all the pages of a Leadtools.RasterImage object to the OCR document is AddPages(image, 1, -1, callback)
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To add a single page from a Leadtools.RasterImage object, you can use AddPage(RasterImage image, OcrProgressCallback callback).
This method will add the page(s) to the end of the collection if you already have pages in this IOcrPageCollection.
You can use the OcrProgressCallback to show the operation progress or to abort it. For more information and an example, refer to OcrProgressCallback.
The LEADTOOLS OCR engine supports pages of dots per inch (DPI) values of 150 and greater. If you try to add a page with a DPI of less than 150 then the engine might be able to recognize any data from this page.
Note, the LEADTOOLS Plus OCR engine does not support image size greater than A3 paper size (11.7 by 16.5 inches at 300 dpi). Attempting to add an image that has a size greater than A3 will result in an error. For document of size greater than the maximum allowed, you must first resize the image before adding it to the LEADTOOLS Plus OCR engine. The Professional and Advantage engines do not have a restriction on the image size.
Note: The value of the "Recognition.ShareOriginalImage" (only supported by the Advantage OCR engine) setting is not used when calling this method. The engine will make a copy of image and store it in the page. Calling IOcrPage.GetRasterImage(OcrPageType.Original) on the page will return a null reference.
Imports Leadtools Imports Leadtools.Codecs Imports Leadtools.Forms.Ocr Imports Leadtools.Forms Imports Leadtools.Forms.DocumentWriters Imports Leadtools.WinForms Imports Leadtools.ImageProcessing.Core Imports Leadtools.Drawing Public Sub AddMultiPageRasterImageExample() Dim imagesPath As String = LEAD_VARS.ImagesDir Dim pdfFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.pdf") ' Load the Ocr1.tif, Ocr2.tif, Ocr3.tif and Ocr4.tif to a single RasterImage object Dim codecs As New RasterCodecs() Dim image As RasterImage = Nothing For i As Integer = 0 To 3 Dim pageFileName As String = Path.Combine(imagesPath, String.Format("Ocr{0}.tif", i + 1)) Dim tempImage As RasterImage = codecs.Load(pageFileName) If (image Is Nothing) Then image = tempImage Else image.AddPage(tempImage) End If Next Console.WriteLine("RasterImage has {0} pages", image.PageCount) ' Create an instance of the engine Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, 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.OcrAdvantageRuntimeDir) ' Create an OCR document Using ocrDocument As IOcrDocument = ocrEngine.DocumentManager.CreateDocument() ' Add the 2nd and 3rd pages to the document Console.WriteLine("Adding the pages from 2 to 3 to the document") ocrDocument.Pages.AddPages(image, 2, 3, Nothing) Console.WriteLine("OCR document has {0} pages", ocrDocument.Pages.Count) ' We do not need the image anymore image.Dispose() ' Recognize ocrDocument.Pages.Recognize(Nothing) ' Save ocrDocument.Save(pdfFileName, DocumentFormat.Pdf, Nothing) 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 OcrAdvantageRuntimeDir As String = "C:\LEADTOOLS 18\Bin\Common\OcrAdvantageRuntime" End Class
using Leadtools; using Leadtools.Codecs; using Leadtools.Forms.Ocr; using Leadtools.Forms.DocumentWriters; using Leadtools.Forms; using Leadtools.ImageProcessing.Core; public void AddMultiPageRasterImageExample() { string pdfFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.pdf"); // Load the Ocr1.tif, Ocr2.tif, Ocr3.tif and Ocr4.tif to a single RasterImage object RasterCodecs codecs = new RasterCodecs(); RasterImage image = null; for (int i = 0; i < 4; i++) { string pageFileName = Path.Combine(LEAD_VARS.ImagesDir, string.Format("Ocr{0}.tif", i + 1)); RasterImage tempImage = codecs.Load(pageFileName); if (image == null) image = tempImage; else image.AddPage(tempImage); } Console.WriteLine("RasterImage has {0} pages", image.PageCount); // Create an instance of the engine using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, 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.OcrAdvantageRuntimeDir); // Create an OCR document using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument()) { // Add the 2nd and 3rd pages to the document Console.WriteLine("Adding the pages from 2 to 3 to the document"); ocrDocument.Pages.AddPages(image, 2, 3, null); Console.WriteLine("Document has {0} pages", ocrDocument.Pages.Count); // We do not need the image anymore image.Dispose(); // Recognize ocrDocument.Pages.Recognize(null); // Save ocrDocument.Save(pdfFileName, DocumentFormat.Pdf, null); } // 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 OcrAdvantageRuntimeDir = @"C:\LEADTOOLS 18\Bin\Common\OcrAdvantageRuntime"; }