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ScrambleCommand Class
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Leadtools.ImageProcessing Namespace : ScrambleCommand Class



Scrambles all or a portion of an image.

Object Model

ScrambleCommand ClassLeadRect Structure

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()
      Dim codecs As RasterCodecs = New RasterCodecs()

      Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
      Dim scrambledFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_scrambled.bmp")
      Dim unscrambledFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_unscrambled.bmp")

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

      Dim rc As LeadRect = New LeadRect(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()
   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 ScrambleCommandExample()
   {
      RasterCodecs codecs = new RasterCodecs();

      string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
      string scrambledFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_scrambled.bmp");
      string unscrambledFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_unscrambled.bmp");

      // Load the source image from disk
      RasterImage image = codecs.Load(srcFileName);

      LeadRect rc = new LeadRect(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();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code


SilverlightVBCopy Code


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

            
            
See Also