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BlankPageDetectorCommand Class
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Leadtools.ImageProcessing.Core Namespace : BlankPageDetectorCommand Class



Detects whether an image is a blank page. This command is available in the Document\Medical Toolkits.

Syntax

Visual Basic (Declaration) 
Public Class BlankPageDetectorCommand 
   Inherits RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As BlankPageDetectorCommand
C# 
public class BlankPageDetectorCommand : RasterCommand, IRasterCommand 
C++/CLI 
public ref class BlankPageDetectorCommand : public RasterCommand, IRasterCommand 

Example

Run the BlankPageDetectorCommand on an image and determine whether it is blank.

Visual BasicCopy Code
Public Sub BlankPageDetectorCommandExample()
   RasterCodecs.Startup()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Clean.tif")

   ' Prepare the command
   Dim command As BlankPageDetectorCommand = New BlankPageDetectorCommand
     'Determine whether the image is blank.
   command.Flags = BlankPageDetectorCommandFlags.DetectNoisyPage

   command.Run(leadImage)
   MessageBox.Show(" Is Blank : " & command.IsBlank & "\n Accuracy : " & (command.Accuracy * 1.0 / 100) & "%", "Blank Page Detection Results")


   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void BlankPageDetectorCommandExample() 
{ 
   // Load an image 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Clean.tif"); 
 
   // Prepare the command 
   BlankPageDetectorCommand command = new BlankPageDetectorCommand(); 
   //Determine whether the image is a blank page 
   command.Flags = BlankPageDetectorCommandFlags.DetectNoisyPage; 
   command.Run(image); 
 
   MessageBox.Show(" Is Blank   : " + command.IsBlank + "\n Accuracy : " + (command.Accuracy * 1.0 / 100) + "%", "Blank Page Detection Results"); 
 
   RasterCodecs.Shutdown(); 
}

Remarks

  • For various reasons, documents being scanned can contain a significant number of blank pages. Disk storage space for the scanned items can be reduced if such pages can be removed before the documents are stored. This command detects whether a page is blank and returns an accuracy value. It can detect blank pages (despite noise, bleed-through, or lines) with high precision and speed.
  • This command does not support 12- or 16-bit grayscale or 48- or 64-bit color images (Exception: Image format not recognized).
  • This command does not support signed data images (Exception: Signed image data not supported).
  • This command does not support 32-bit grayscale images.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Core.BlankPageDetectorCommand

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also