Leadtools.Forms.Ocr Namespace > IOcrPageCollection Interface > InsertPage Method : InsertPage(Int32,RasterImage,OcrProgressCallback) Method |
IOcrPage InsertPage( int pageIndex, RasterImage image, OcrProgressCallback callback )
'Declaration Overloads Function InsertPage( _ ByVal pageIndex As Integer, _ ByVal image As RasterImage, _ ByVal callback As OcrProgressCallback _ ) As IOcrPage
'Usage Dim instance As IOcrPageCollection Dim pageIndex As Integer Dim image As RasterImage Dim callback As OcrProgressCallback Dim value As IOcrPage value = instance.InsertPage(pageIndex, image, callback)
IOcrPage InsertPage( int pageIndex, RasterImage image, OcrProgressCallback callback )
function Leadtools.Forms.Ocr.IOcrPageCollection.InsertPage(Int32,RasterImage,OcrProgressCallback)( pageIndex , image , callback )
IOcrPage^ InsertPage( int pageIndex, RasterImage^ image, 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.
If image contains more than one page, then the current page as defined in RasterImage.Page is the one inserted to the OCR document.
To insert all or specific range of the pages of a multi-page Leadtools.RasterImage object to the OCR document, either iterate through the pages by changing to the value of RasterImage.Page to go from 1 to RasterImage.PageCount or use the InsertPages(int pageIndex, RasterImage image, int imageFirstPageNumber, int imageLastPageNumber, OcrProgressCallback callback) method.
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.
Public Sub InsertPageFromRasterImageExample() 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() ' Create an instance of the engine Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Plus, 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, Nothing) ' Create an OCR document Using ocrDocument As IOcrDocument = ocrEngine.DocumentManager.CreateDocument() ' Loop through the images, insert them in the reverse order For i As Integer = 0 To 3 Dim pageFileName As String = Path.Combine(imagesPath, String.Format("Ocr{0}.tif", i + 1)) Using image As RasterImage = codecs.Load(pageFileName) ocrDocument.Pages.InsertPage(0, image, Nothing) End Using Next ' 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" End Class
public void InsertPageFromRasterImageExample() { 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(); // Create an instance of the engine using(IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Plus, 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, null); // Create an OCR document using(IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument()) { // Loop through the images, insert them in the reverse order for(int i = 0; i < 4; i++) { string pageFileName = Path.Combine(LEAD_VARS.ImagesDir, string.Format("Ocr{0}.tif", i + 1)); using(RasterImage image = codecs.Load(pageFileName)) ocrDocument.Pages.InsertPage(0, image, null); } // 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"; }
[TestMethod] public async Task InsertPageFromRasterImageExample() { string pdfFileName = "Ocr1.pdf"; RasterCodecs codecs = new RasterCodecs(); // Create an instance of the engine 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, String.Empty, Tools.OcrEnginePath); // Create an OCR document IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument(); // Loop through the images, insert them in the reverse order for(int i = 0; i < 4; i++) { string pageFileName = string.Format(@"Assets\Ocr{0}.tif", i + 1); StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(pageFileName); using (RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile))) ocrDocument.Pages.InsertPage(0, image, null); } // Recognize ocrDocument.Pages.Recognize(null); // Save StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(pdfFileName, CreationCollisionOption.ReplaceExisting); await ocrDocument.SaveAsync(LeadStreamFactory.Create(saveFile), DocumentFormat.Pdf, null); // Shutdown the engine ocrEngine.Shutdown(); codecs.Dispose(); }
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2