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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. Supported in Silverlight, Windows Phone 7

Object Model

BlankPageDetectorCommand Class

Syntax

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

Example

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

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

   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "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")


End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
C#Copy Code
public void BlankPageDetectorCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

      RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "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");

   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void BlankPageDetectorCommandExample(RasterImage image)
{
   // Prepare the command
   BlankPageDetectorCommand command = new BlankPageDetectorCommand();
   //Determine whether the image is a blank page
   command.Flags = BlankPageDetectorCommandFlags.DetectNoisyPage;
   command.Run(image);
   Debug.WriteLine(" Is Blank   : " + command.IsBlank + "\n Accuracy : " + (command.Accuracy * 1.0 / 100) + "%", "Blank Page Detection Results", MessageBoxButton.OK);

   image.Dispose();
}
SilverlightVBCopy Code
Public Sub BlankPageDetectorCommandExample(ByVal image As RasterImage)
   ' Prepare the command
   Dim command As BlankPageDetectorCommand = New BlankPageDetectorCommand()
   'Determine whether the image is a blank page
   command.Flags = BlankPageDetectorCommandFlags.DetectNoisyPage
   command.Run(image)
   Debug.WriteLine(" Is Blank   : " & command.IsBlank + Constants.vbLf & " Accuracy : " & (command.Accuracy * 1.0 / 100) & "%", "Blank Page Detection Results", MessageBoxButton.OK)

   image.Dispose()
End Sub

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: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also