BlankPageDetectorCommand Class

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public class BlankPageDetectorCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration
 
Public Class BlankPageDetectorCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage
 
Dim instance As BlankPageDetectorCommand

public sealed class BlankPageDetectorCommand : Leadtools.ImageProcessing.IRasterCommand

@interface LTBlankPageDetectorCommand : LTRasterCommand

public class BlankPageDetectorCommand extends RasterCommand

function Leadtools.ImageProcessing.Core.BlankPageDetectorCommand()

public ref class BlankPageDetectorCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

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 supports unsigned 8-bit data images, but not signed ones.
This command does not support 32-bit grayscale images.
For Silverlight and Windows Phone, to load a 24-bit color images, set the Leadtools.Codecs.CodecsLoadOptions.UseWriteableBitmap property to false.

In Silverlight and Windows Phone versions of LEADTOOLS, this image processing command will fail if the image data for the RasterImage object is stored internally using a Silverlight WriteableBitmap object. For more information, refer to Image Processing Command Limitations in Silverlight.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

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

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

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";
}

function BlankPageDetectorCommandExample()
{
   var codecs = new Leadtools.Codecs.RasterCodecs();
   codecs.throwExceptionsOnInvalidImages = true;

   // Load the image
   var srcFileName = "Assets\\Clean.tif";
   return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
      return codecs.loadAsync(Leadtools.LeadStreamFactory.create(loadFile));
   }).then(function (image){
      // Prepare the command
      with (Leadtools.ImageProcessing.Core) {
         var command = new BlankPageDetectorCommand();
         //Determine whether the image is a blank page
         command.flags = BlankPageDetectorCommandFlags.detectNoisyPage;
         command.run(image);

         console.error(" Is Blank   : " + command.isBlank + "\n Accuracy : " + (command.accuracy * 1.0 / 100) + "% ", "Blank Page Detection Results");
      }
   });
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

      
public async Task BlankPageDetectorCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   // Load the image
   string srcFileName = @"Assets\Clean.tif";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // 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");

}

using Leadtools;
using Leadtools.Examples;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

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();
}

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

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

Target Platforms

Reference

BlankPageDetectorCommand Members
Leadtools.ImageProcessing.Core Namespace
Introduction to Image Processing With LEADTOOLS
DeskewCommand Class
DespeckleCommand Class
LineRemoveCommand Class
AutoCropCommand Class