OcrAutoPreprocessPageCommand Enumeration

Summary

Performs page pre-processing commands

Syntax

Objective-C

C++/CLI

Java

Python

[SerializableAttribute()] 
public enum OcrAutoPreprocessPageCommand

typedef NS_ENUM(NSInteger, LTOcrAutoPreprocessPageCommand) { 
 LTOcrAutoPreprocessPageCommandNone,  
 LTOcrAutoPreprocessPageCommandDeskew,  
 LTOcrAutoPreprocessPageCommandRotate,  
 LTOcrAutoPreprocessPageCommandInvert,  
 LTOcrAutoPreprocessPageCommandAll 
};

public enum OcrAutoPreprocessPageCommand

[SerializableAttribute()] 
public enum class OcrAutoPreprocessPageCommand

class OcrAutoPreprocessPageCommand(Enum): 
   Deskew = 0 
   Rotate = 1 
   Invert = 2 
   All = 3

Members

Value	Member	Description
0	Deskew	Automatic deskewing. If the image is skewed, the IOcrPage.AutoPreprocess method will try to deskew it
1	Rotate	Automatic rotation. If the image is rotated (its view perspective is anything other than top-left), the IOcrPage.AutoPreprocess method will auto orient it to top-left. This command is especially useful if the image upside-down.
2	Invert	Automatic inversion. If the image is black and white and is inverted (contains white on black data), the IOcrPage.AutoPreprocess method will automatically convert the image data to be black on white
3	All	Run all the commands (Deskew, Rotate, Invert)

Remarks

The OCR engine can perform a series of image pre-processing steps in order to enhance the quality of the image before starting its recognition.

Perform these image pre-processing steps by calling the IOcrPage.AutoPreprocess method. Call this method prior to calling IOcrPage.Recognize.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Ocr; 
using Leadtools.Forms.Common; 
using Leadtools.Document.Writer; 
using Leadtools.WinForms; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
public void AutoPreprocessExample() 
{ 
   string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "Clean.tif"); 
   string pdfFileName = Path.Combine(LEAD_VARS.ImagesDir, "Clean.pdf"); 
 
   // Create an instance of the engine 
   using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD)) 
   { 
      // Start the engine using default parameters 
      ocrEngine.Startup(null, null, null, LEAD_VARS.OcrLEADRuntimeDir); 
 
      // Create an OCR document 
      using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument()) 
      { 
         // Add this image to the document 
         IOcrPage ocrPage = ocrDocument.Pages.AddPage(tifFileName, null); 
 
         // Auto-preprocess it 
         ocrPage.AutoPreprocess(OcrAutoPreprocessPageCommand.Deskew, null); 
         ocrPage.AutoPreprocess(OcrAutoPreprocessPageCommand.Invert, null); 
         ocrPage.AutoPreprocess(OcrAutoPreprocessPageCommand.Rotate, null); 
 
         // Recognize it and save it as PDF 
         ocrPage.Recognize(null); 
         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:\LEADTOOLS23\Resources\Images"; 
   public const string OcrLEADRuntimeDir = @"C:\LEADTOOLS23\Bin\Common\OcrLEADRuntime"; 
}

Requirements

Target Platforms

Reference

Leadtools.Ocr Namespace

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Help Version 23.0.2024.4.19

Leadtools.Ocr Assembly

Introduction

Getting Started

Namespaces

Leadtools.Ocr Namespace

Assemblies