Leadtools.Forms.Ocr Namespace : IOcrPageCollection Interface |
[DefaultMemberAttribute("Item")] public interface IOcrPageCollection : System.Collections.Generic.ICollection<IOcrPage>, System.Collections.Generic.IEnumerable<IOcrPage>, System.Collections.Generic.IList<IOcrPage>, System.Collections.IEnumerable
'Declaration <DefaultMemberAttribute("Item")> Public Interface IOcrPageCollection Inherits System.Collections.Generic.ICollection(Of IOcrPage), System.Collections.Generic.IEnumerable(Of IOcrPage), System.Collections.Generic.IList(Of IOcrPage), System.Collections.IEnumerable
'Usage Dim instance As IOcrPageCollection
[DefaultMemberAttribute("Item")] public interface IOcrPageCollection : System.Collections.Generic.ICollection<IOcrPage>, Windows.Foundation.Collections.IIterable //In WinRT the IEnumerableinterface is replaced by IIterable <IOcrPage>, Windows.Foundation.Collections.IVector //In WinRT the IListinterface is replaced by IVector <IOcrPage>, System.Collections.IEnumerable
@interface LTOcrPageCollection : NSMutableArray
public class OcrPageCollection implements List<OcrPage>
function Leadtools.Forms.Ocr.IOcrPageCollection() System.Collections.Generic.ICollection, System.Collections.Generic.IEnumerable, System.Collections.Generic.IList, System.Collections.IEnumerable
[DefaultMemberAttribute("Item")] public interface class IOcrPageCollection : public System.Collections.Generic.ICollection<IOcrPage>, System.Collections.Generic.IEnumerable<IOcrPage>, System.Collections.Generic.IList<IOcrPage>, System.Collections.IEnumerable
IOcrPageCollection holds the pages currently added into an OCR document (IOcrDocument). IOcrDocument through the IOcrDocument.Pages holds a collection of IOcrPage object. Each of these IOcrPage objects contains the raster image used to create it (the image used when the page is loaded or added) and a group of OCR zones for the page either added manually or through auto-zoning.
The IOcrPageCollection interface implements standard .NET ICollection, IList, and IEnumerable interfaces and hence, you can use the member of these interfaces to add, remove, get, set and iterate through the different pages of the OCR document.
The following list contains the major functionality of the IOcrPageCollection interface:
Methods | Description |
---|---|
AddPage | Adds a single page from a Leadtools.RasterImage, DIB or an image file in disk file, .NET stream, remote URL. |
AddPages | Adds multiple pages from a multi-page Leadtools.RasterImage or an image file in disk file, .NET stream or remote URL. |
InsertPage | Inserts into a specific location a single page from a Leadtools.RasterImage, DIB or an image file in disk file, .NET stream, remote URL. |
InsertPages | Inserts into a specific location multiple pages from a multi-page Leadtools.RasterImage or an image file in disk file, .NET stream or remote URL. |
Methods | Description |
---|---|
ExportPage | Saves a single page from the OCR document to a Leadtools.RasterImage object, an image file in disk file or a .NET stream. |
ExportPages | Saves multiple pages from the OCR document to a multi-page Leadtools.RasterImage object, an image file in disk file or a .NET stream. |
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.
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 PageCollectionExamples() ' For this example, we need a multi-page TIF file. ' Create a muti-page TIF from Ocr1.tif, Ocr2.tif, Ocr3.tif and Ocr4.tif Dim imagesPath As String = LEAD_VARS.ImagesDir Dim tifFileName As String = Path.Combine(imagesPath, "Ocr.tif") If (File.Exists(tifFileName)) Then File.Delete(tifFileName) End If Using codecs As New RasterCodecs() 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) codecs.Save(image, tifFileName, RasterImageFormat.CcittGroup4, 1, 1, 1, -1, CodecsSavePageMode.Append) End Using Next End Using Dim pdfFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Ocr.pdf") ' Create an instance of the engine Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, False) ' Start the engine using default parameters ocrEngine.Startup(Nothing, Nothing, Nothing, LEAD_VARS.OcrAdvantageRuntimeDir) ' Create an OCR document Using ocrDocument As IOcrDocument = ocrEngine.DocumentManager.CreateDocument() ' Load all the pages of the multi-page tif file we created into the document ocrDocument.Pages.AddPages(tifFileName, 1, -1, Nothing) Console.WriteLine("{0} pages added to the document", ocrDocument.Pages.Count) ' Auto-zone ocrDocument.Pages.AutoZone(Nothing) ' 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 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 PageCollectionExamples() { // For this example, we need a multi-page TIF file. // Create a muti-page TIF from Ocr1.tif, Ocr2.tif, Ocr3.tif and Ocr4.tif string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr.tif"); if (File.Exists(tifFileName)) File.Delete(tifFileName); using (RasterCodecs codecs = new RasterCodecs()) { 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)) codecs.Save(image, tifFileName, RasterImageFormat.CcittGroup4, 1, 1, 1, -1, CodecsSavePageMode.Append); } } string pdfFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr.pdf"); // Create an instance of the engine using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false)) { // Start the engine using default parameters ocrEngine.Startup(null, null, null, LEAD_VARS.OcrAdvantageRuntimeDir); // Create an OCR document using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument()) { // Load all the pages of the multi-page tif file we created into the form ocrDocument.Pages.AddPages(tifFileName, 1, -1, null); Console.WriteLine("{0} pages added to the document", ocrDocument.Pages.Count); // Auto-zone ocrDocument.Pages.AutoZone(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(); } } static class LEAD_VARS { public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; public const string OcrAdvantageRuntimeDir = @"C:\LEADTOOLS 18\Bin\Common\OcrAdvantageRuntime"; }
using Leadtools; using Leadtools.Codecs; using Leadtools.Forms.Ocr; using Leadtools.Forms.DocumentWriters; using Leadtools.Forms; using Leadtools.ImageProcessing.Core; [TestMethod] public async Task PageCollectionExamples() { // For this example, we need a multi-page TIF file. string tifFileName = @"Assets\Ocr1.tif"; string pdfFileName = "Ocr.pdf"; // Create an instance of the engine IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false); // Start the engine using default parameters ocrEngine.Startup(null, null, String.Empty, Tools.OcrEnginePath); // Create an OCR document IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument(); // Load all the pages of the multi-page tif file we created into the form using (RasterCodecs codecs = new RasterCodecs()) { StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(tifFileName); using (RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile))) { ocrDocument.Pages.AddPage(image, null); Debug.WriteLine("{0} pages added to the document", ocrDocument.Pages.Count); } } // Auto-zone ocrDocument.Pages.AutoZone(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(); }