UserFilterCommand Class

Summary

Filters the image based on a user-defined filter / mask. This command is similar to the spatial and binary filter commands.

Syntax

Objective-C

C++

Java

public class UserFilterCommand : RasterCommand

Public Class UserFilterCommand  
   Inherits RasterCommand

@interface LTUserFilterCommand : LTRasterCommand

public class UserFilterCommand extends RasterCommand

public ref class UserFilterCommand : public RasterCommand

Remarks

With this command you can create a user-defined filter and apply it to the image. The filter has a rectangular form (matrix) where the values are user-defined. It allows the creation of simple customized filters, where each value in matrix is multiplied by the corresponding pixel, and then the specified operation is performed on the results.
When the filter is applied to pixels from the edge and you choose the sum operation, the edge rows and columns are duplicated. For example, if the pixel (-1, 5) is needed, the pixel (0, 5) is used instead.
This command 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.

Example

Run the UserFilterCommand on an image, In this example the high pass.filter will be applied using user defined matrix.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Effects; 
 
public void UserFilterCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")); 
 
   // Prepare the command 
   int i, j; 
   UserFilterCommand command = new UserFilterCommand(); 
   command.CenterPoint = new LeadPoint(1, 1); 
   command.Divisor = 1; 
   command.Offset = 0; 
   command.Type = UserFilterCommandType.Sum; 
   command.FilterHeight = 3; 
   command.FilterWidth = 3; 
   command.Matrix = new int[9]; 
 
   // Initialize the array with factor used to apply the high pass filter. 
   for (i = 0; i < 3; i++) 
   { 
      for (j = 0; j < 3; j++) 
      { 
         if (j == 1 || i == 1) 
         { 
            if (j == 1 && i == 1) 
               command.Matrix[i * 3 + j] = 5; 
            else 
               command.Matrix[i * 3 + j] = -1; 
         } 
         else 
            command.Matrix[i * 3 + j] = 0; 
      } 
   } 
 
   // Apply the high pass custom filter. 
   command.Run(image); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Effects 
 
Public Sub UserFilterCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")) 
 
   ' Prepare the command 
   Dim i As Integer 
   Dim j As Integer 
   Dim matrix() As Integer 
   ReDim matrix(8) 
 
   Dim command As UserFilterCommand = New UserFilterCommand 
   command.CenterPoint = New LeadPoint(1, 1) 
   command.Divisor = 1 
   command.Offset = 0 
   command.Type = UserFilterCommandType.Sum 
   command.FilterHeight = 3 
   command.FilterWidth = 3 
   command.Matrix = matrix 
 
   ' Initialize the array with factor used to apply the high pass filter. 
   For i = 0 To 2 
      For j = 0 To 2 
         If (j = 1 Or i = 1) Then 
            If (j = 1 And i = 1) Then 
               command.Matrix(i * 3 + j) = 5 
            Else 
               command.Matrix(i * 3 + j) = -1 
            End If 
         Else 
            command.Matrix(i * 3 + j) = 0 
         End If 
      Next 
   Next 
 
   ' Apply the high pass custom filter. 
   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:\LEADTOOLS21\Resources\Images" 
End Class