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MathematicalFunctionCommand Class
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Re-maps the image colors according to a mathematical function such as: square, logarithm, square root, sine and cosine. Supported in Silverlight, Windows Phone 7

Object Model

MathematicalFunctionCommand Class

Syntax

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

Example

Run the Leadtools.ImageProcessing.Color.MathematicalFunctionCommand on an image with square function selected and factor = 50.

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

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

   ' Prepare the command
   Dim command As MathematicalFunctionCommand = New MathematicalFunctionCommand
   command.Type = MathematicalFunctionCommandType.Square
   command.Factor = 50
   'Apply Square Function to this image.
   command.Run(leadImage)
   codecs.Save(leadImage, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24)

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 MathematicalFunctionCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

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

      // Prepare the command
      MathematicalFunctionCommand command = new MathematicalFunctionCommand();
      command.Type   = MathematicalFunctionCommandType.Square;
      command.Factor = 50;
      //Apply Square Function to this image.
      command.Run(image);
      codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24);

   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void MathematicalFunctionCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   MathematicalFunctionCommand command = new MathematicalFunctionCommand();
   command.Type   = MathematicalFunctionCommandType.Square;
   command.Factor = 50;
   //Apply Square Function to this image.
   command.Run(image);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
}
SilverlightVBCopy Code
Public Sub MathematicalFunctionCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As MathematicalFunctionCommand = New MathematicalFunctionCommand()
   command.Type = MathematicalFunctionCommandType.Square
   command.Factor = 50
   'Apply Square Function to this image.
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub

Remarks

  • This class uses the RGB color space.
  • This class makes it possible to apply one of five mathematical functions to an image's pixel values: square, square root, logarithm, sine and cosine.
  • Set the mathematical operation to be performed on each pixel's values in the Type property. The resulting values are multiplied by the Factor property value. The Factor property can be any value greater than 0. It is divided internally by different amounts, according to the type of the function being used.
  • If the image has a region, the effect will be applied on the region only.
  • This class supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
  • This command does not support 32-bit grayscale images.
For more information, refer to Changing Brightness and Contrast.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Color.MathematicalFunctionCommand

Requirements

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

See Also