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IsInverted Method

Gets a value that indicate whether this IOcrPage is inverted.
public bool IsInverted() 
- (BOOL)isInverted:(NSError **)error 
public boolean isInverted() 
bool IsInverted();  
def IsInverted(self): 

Return Value

true if this IOcrPage is inverted; otherwise, false.


You can use this method to detect if the page is inverted (has white text over black background). This method will work on the processing version of the image inside the page (OcrPageType.Processing).

Use AutoPreprocess with OcrAutoPreprocessPageCommand.Invert to automatically invert the page image prior to calling Recognize. This could enhance the quality of the image before starting its recognition.

If the image is inverted, IsInverted will return true, if you call AutoPreprocess on the page, all subsequent calls to IsInverted will return false since the image is no inverted. Hence, you must use IsInverted before calling AutoPreprocess.

Use GetPreprocessValues to obtain the accumulative pre-processing values applied to this IOcrPage.

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 
         ocrDocument.Save(pdfFileName, DocumentFormat.Pdf, null); 
      // Shutdown the engine 
      // Note: calling Dispose will also automatically shutdown the engine if it has been started 
static class LEAD_VARS 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
   public const string OcrLEADRuntimeDir = @"C:\LEADTOOLS23\Bin\Common\OcrLEADRuntime"; 

Target Platforms

Help Version 23.0.2024.4.19
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Leadtools.Ocr Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.