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ScrambleCommand Class
See Also  Members   Example 
Leadtools.ImageProcessing Namespace : ScrambleCommand Class



Scrambles all or a portion of an image.

Syntax

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

Example

This example will scramble the upper-left quadrant of an image using the key 123 and then save the image to disk. It will then unscrambles it and saves it disk for comparism.

Visual BasicCopy Code
Public Sub ScrambleCommandExample()
 RasterCodecs.Startup()
 Dim codecs As RasterCodecs = New RasterCodecs()

 Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"
 Dim scrambledFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_scrambled.bmp"
 Dim unscrambledFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_unscrambled.bmp"

 ' Load the source image from disk
 Dim image As RasterImage = codecs.Load(srcFileName)

 Dim rc As Rectangle = New Rectangle(0, 0, image.Width \ 2, image.Height \ 2)
 Dim key As Integer = 123

 ' Scramble it and save it to disk
 Dim command As ScrambleCommand = New ScrambleCommand()
 command.Flags = ScrambleCommandFlags.Encrypt
 command.Rectangle = rc
 command.Key = key
 command.Run(image)
 codecs.Save(image, scrambledFileName, RasterImageFormat.Bmp, 24)

 ' Unscramble the image and save it to disk
 command.Flags = ScrambleCommandFlags.Decrypt
 command.Run(image)
 codecs.Save(image, unscrambledFileName, RasterImageFormat.Bmp, 24)

 ' Clean Up
 image.Dispose()
 RasterCodecs.Shutdown()
      End Sub
C#Copy Code
public void ScrambleCommandExample() 
{ 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"; 
   string scrambledFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_scrambled.bmp"; 
   string unscrambledFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_unscrambled.bmp"; 
 
   // Load the source image from disk 
   RasterImage image = codecs.Load(srcFileName); 
 
   Rectangle rc = new Rectangle(0, 0, image.Width / 2, image.Height / 2); 
   int key = 123; 
 
   // Scramble it and save it to disk 
   ScrambleCommand command = new ScrambleCommand(); 
   command.Flags = ScrambleCommandFlags.Encrypt; 
   command.Rectangle = rc; 
   command.Key = key; 
   command.Run(image); 
   codecs.Save(image, scrambledFileName, RasterImageFormat.Bmp, 24); 
 
   // Unscramble the image and save it to disk 
   command.Flags = ScrambleCommandFlags.Decrypt; 
   command.Run(image); 
   codecs.Save(image, unscrambledFileName, RasterImageFormat.Bmp, 24); 
 
   // Clean Up 
   image.Dispose(); 
   RasterCodecs.Shutdown(); 
}

Remarks

This command is available in the Document/Medical Imaging editions toolkits.

Scrambling a rectangular area means that the pixels in that area are shuffled around into a pseudo-random location within the area.

  • No colors are introduced
  • Color counts remain unchanged

Given the same encrypt area (defined by ScrambleCommand.Rectangle) and the same ScrambleCommand.Key, setting ( ScrambleCommand.Flags = ScrambleCommandFlags.Encrypt) is the inverse of (ScrambleCommand.Flags = ScrambleCommandFlags.Decrypt).

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.ScrambleCommand

Requirements

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

See Also