Manages the OCR documents of this IOcrEngine.
public interface IOcrDocumentManager
Public Interface IOcrDocumentManager
public interface IOcrDocumentManager
@interface LTOcrDocumentManager : NSObject
public class OcrDocumentManager
function Leadtools.Forms.Ocr.IOcrDocumentManager()
public interface class IOcrDocumentManager
You can access the instance of the IOcrDocumentManager used by an IOcrEngine through the IOcrEngine.DocumentManager property.
The IOcrDocumentManager interface allows you to create IOcrDocument objects that encapsulate an OCR'ed document. Each OCR document contains a collection of IOcrPage that you can use to add and remove pages from the document. After you add the pages to the document and optionally manage the zones on the pages, you can call the IOcrPage.Recognize method on each page to obtain the recognition data and store them internally in the pages. Once you are done, you can use the save methods of the IOcrDocument object to save the document into its final format.
LEADTOOLS supports saving to various standard document formats such as PDF, Microsoft Word, HTML and several others through the LEADTOOLS Document Writers engine. For more information, refer to IOcrDocument and DocumentFormat.
IOcrDocumentManager supports creating documents in two ways:
In this mode, the OCR pages are required to be in memory before saving. This is not recommended when the document have a large amount of pages and either using a file-based document or using the LEADTOOLS Temporary file format (DocumentFormat.Ltd is required.
In memory-based IOcrDocument, the IOcrPageCollection holds the pages. The user can recognize any or all of the pages at any time and pages can be added or removed at will.
Use or IOcrDocumentManager.CreateDocument](iocrdocumentmanager-createdocument.html) or [IOcrDocumentManager.CreateDocument(string, OcrCreateDocumentOptions) with the OcrCreateDocumentOptions.InMemory flag to create such documents.
IOcrDocument.IsInMemory will be true for memory-based documents.
In this mode, the OCR pages are not required to be in memory before saving. This mode is recommended when the document have a large amount of pages and.
In file-based IOcrDocument, the IOcrPageCollection is a store-only view of the pages. when page is added, a snap shot of the current recognition data is saved into the document. This data cannot be modified any more and the page is no longer needed. The user must recognize the pages before they are added to the document and pages can only be added but not removed.
File-based documents can also be saved and re-loaded to continue adding pages or converting to final document at a later time. For more information and examples, refer to Programming with the LEADTOOLS .NET OCR.
Use IOcrDocumentManager.CreateDocument(string, OcrCreateDocumentOptions) without the OcrCreateDocumentOptions.InMemory flag to create such documents.
IOcrDocument.IsInMemory will be false for memory-based documents. The current back-end file name can be obtained through IOcrDocument.FileName.
Typical OCR operation using the IOcrEngine involves starting up the engine, create an IOcrDocument object using the IOcrDocumentManager.CreateDocument method and adding the pages into it and perform either automatic or manual zoning. Once this is done, After the recognition data is collected using IOcrPage.Recognize, you use the various IOcrDocument.Save methods to save the document to its final format such as PDF, DOC or HTML.
In addition to the above, you can use IOcrDocument.SaveXml to save the document as XML.
This example save a page to all the formats supported by the LEADTOOLS OCR Advantage engine.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Forms.Ocr;
using Leadtools.Forms;
using Leadtools.Forms.DocumentWriters;
using Leadtools.WinForms;
public void OcrDocumentManagerExample()
{
string tifFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif");
string tifFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "Ocr2.tif");
string outputDirectory = Path.Combine(LEAD_VARS.ImagesDir, "OutputDirectory");
// Create the output directory
if (Directory.Exists(outputDirectory))
Directory.Delete(outputDirectory, true);
Directory.CreateDirectory(outputDirectory);
// Create an instance of the engine
using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false))
{
// Start the engine using default parameters
Console.WriteLine("Starting up the engine...");
ocrEngine.Startup(null, null, null, LEAD_VARS.OcrAdvantageRuntimeDir);
// Create the OCR document
Console.WriteLine("Creating the OCR document...");
IOcrDocumentManager ocrDocumentManager = ocrEngine.DocumentManager;
using (IOcrDocument ocrDocument = ocrDocumentManager.CreateDocument())
{
// Add the pages to the document
Console.WriteLine("Adding the pages...");
ocrDocument.Pages.AddPage(tifFileName1, null);
ocrDocument.Pages.AddPage(tifFileName2, null);
// Recognize the pages to this document. Note, we did not call AutoZone, it will explicitly be called by Recognize
Console.WriteLine("Recognizing all the pages...");
ocrDocument.Pages.Recognize(null);
// Save to all the formats supported by this OCR engine
Array formats = Enum.GetValues(typeof(DocumentFormat));
foreach (DocumentFormat format in formats)
{
string friendlyName = DocumentWriter.GetFormatFriendlyName(format);
Console.WriteLine("Saving (using default options) to {0}...", friendlyName);
// Construct the output file name (output_directory + document_format_name + . + extension)
string extension = DocumentWriter.GetFormatFileExtension(format);
string outputFileName = Path.Combine(outputDirectory, format.ToString() + "." + extension);
// Save the document
ocrDocument.Save(outputFileName, format, null);
// If this is the LTD format, convert it to PDF
if (format == DocumentFormat.Ltd)
{
Console.WriteLine("Converting the LTD file to PDF...");
string pdfFileName = Path.Combine(outputDirectory, format.ToString() + "_pdf.pdf");
DocumentWriter docWriter = ocrEngine.DocumentWriterInstance;
docWriter.Convert(outputFileName, pdfFileName, DocumentFormat.Pdf);
}
}
// Now save to all the engine native formats (if any) supported by the engine
string[] engineFormats = ocrDocumentManager.GetSupportedEngineFormats();
foreach (string engineFormat in engineFormats)
{
string friendlyName = ocrDocumentManager.GetEngineFormatFriendlyName(engineFormat);
Console.WriteLine("Saving to engine native format {0}...", friendlyName);
// Construct the output file name (output_directory + "engine" + engine_format_name + . + extension)
string extension = ocrDocumentManager.GetEngineFormatFileExtension(engineFormat);
string outputFileName = Path.Combine(outputDirectory, "engine_" + engineFormat + "." + extension);
// To use this format, set it in the IOcrDocumentManager.EngineFormat and do a normal save using DocumentFormat.User
// Save the document
ocrDocumentManager.EngineFormat = engineFormat;
ocrDocument.Save(outputFileName, DocumentFormat.User, null);
}
}
// Shutdown the engine
// Note: calling Dispose will also automatically shutdown the engine if it has been started
Console.WriteLine("Shutting down...");
ocrEngine.Shutdown();
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
public const string OcrAdvantageRuntimeDir = @"C:\LEADTOOLS 19\Bin\Common\OcrAdvantageRuntime";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Forms.Ocr
Imports Leadtools.Forms
Imports Leadtools.Forms.DocumentWriters
Imports Leadtools.WinForms
Public Sub OcrDocumentManagerExample()
Dim tifFileName1 As String = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif")
Dim tifFileName2 As String = Path.Combine(LEAD_VARS.ImagesDir, "Ocr2.tif")
Dim outputDirectory As String = LEAD_VARS.ImagesDir
' Create an instance of the engine
Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, False)
' Start the engine using default parameters
Console.WriteLine("Starting up the engine...")
ocrEngine.Startup(Nothing, Nothing, Nothing, LEAD_VARS.OcrAdvantageRuntimeDir)
' Create the OCR document
Console.WriteLine("Creating the OCR document...")
Dim ocrDocumentManager As IOcrDocumentManager = ocrEngine.DocumentManager
Using ocrDocument As IOcrDocument = ocrDocumentManager.CreateDocument()
' Add the pages to the document
Console.WriteLine("Adding the pages...")
ocrDocument.Pages.AddPage(tifFileName1, Nothing)
ocrDocument.Pages.AddPage(tifFileName2, Nothing)
' Recognize the pages to this document. Note, we did not call AutoZone, it will explicitly be called by Recognize
Console.WriteLine("Recognizing all the pages...")
ocrDocument.Pages.Recognize(Nothing)
' Save to all the formats supported by this OCR engine
Dim formats As Array = [Enum].GetValues(GetType(DocumentFormat))
For Each format As DocumentFormat In formats
Dim friendlyName As String = DocumentWriter.GetFormatFriendlyName(format)
Console.WriteLine("Saving (using default options) to {0}...", friendlyName)
' Construct the output file name (output_directory + document_format_name + . + extension)
Dim extension As String = DocumentWriter.GetFormatFileExtension(format)
Dim outputFileName As String = Path.Combine(outputDirectory, format.ToString() & "." & extension)
' Save the document
ocrDocument.Save(outputFileName, format, Nothing)
' If this is the LTD format, convert it to PDF
If format = DocumentFormat.Ltd Then
Console.WriteLine("Converting the LTD file to PDF...")
Dim pdfFileName As String = Path.Combine(outputDirectory, format.ToString() & "_pdf.pdf")
Dim docWriter As DocumentWriter = ocrEngine.DocumentWriterInstance
docWriter.Convert(outputFileName, pdfFileName, DocumentFormat.Pdf)
End If
Next
' Now save to all the engine native formats (if any) supported by the engine
Dim engineFormats As String() = ocrDocumentManager.GetSupportedEngineFormats()
For Each engineFormat As String In engineFormats
Dim friendlyName As String = ocrDocumentManager.GetEngineFormatFriendlyName(engineFormat)
Console.WriteLine("Saving to engine native format {0}...", friendlyName)
' Construct the output file name (output_directory + "engine" + engine_format_name + . + extension)
Dim extension As String = ocrDocumentManager.GetEngineFormatFileExtension(engineFormat)
Dim outputFileName As String = Path.Combine(outputDirectory, "engine_" & engineFormat & "." & extension)
' To use this format, set it in the IOcrDocumentManager.EngineFormat and do a normal save using DocumentFormat.User
' Save the document
ocrDocumentManager.EngineFormat = engineFormat
ocrDocument.Save(outputFileName, DocumentFormat.User, Nothing)
Next
End Using
' Shutdown the engine
' Note: calling Dispose will also automatically shutdown the engine if it has been started
Console.WriteLine("Shutting down...")
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 19\Bin\Common\OcrAdvantageRuntime"
End Class
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