MathematicalFunctionCommand Class

Summary

Re-maps the image colors according to a mathematical function such as: square, logarithm, square root, sine and cosine.

Syntax

Objective-C

C++

Java

public class MathematicalFunctionCommand : RasterCommand

Public Class MathematicalFunctionCommand  
   Inherits RasterCommand

@interface LTMathematicalFunctionCommand : LTRasterCommand

public class MathematicalFunctionCommand extends RasterCommand

public ref class MathematicalFunctionCommand : public RasterCommand

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.

Example

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

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
 
public void MathematicalFunctionCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\NaturalFruits.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"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Color 
 
Public Sub MathematicalFunctionCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ImageProcessingDemo\\NaturalFruits.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#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Examples; 
 
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(); 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Color 
 
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