KeyStoneCommand Class

C#
Visual Basic
WinRT C#
Java
Objective-C
WinRT JavaScript
C++

public class KeyStoneCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration

Public Class KeyStoneCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage

Dim instance As KeyStoneCommand

public sealed class KeyStoneCommand : Leadtools.ImageProcessing.IRasterCommand

@interface LTKeyStoneCommand : LTRasterCommand

public class KeyStoneCommand extends RasterCommand

function Leadtools.ImageProcessing.Core.KeyStoneCommand()

public ref class KeyStoneCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

The KeyStoneCommand is useful for correcting the perspective of images captured by portable devices. Frequently, images are distorted because they are projected onto a surface at an angle. Vertical lines become slanted, etc.
The KeyStoneCommand maps a polygon to a rectangle. The PerspectiveCommand maps a rectangle to a polygon.
If the input list of points that represents the polygon has more than 4 points, an Invalid Parameters Exception will be thrown.
This function 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 in the Document/Medical Imaging toolkits.
This command supports signed/unsigned images.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

   
Public Sub KeyStoneCommandExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True
   'Load an image
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"))

   'Dim PolyPoints As List(Of LeadPoint) = New List(Of LeadPoint)()
   Dim PolyPoints() As LeadPoint = New LeadPoint(4) {}

   'The four corners of the polygon
   PolyPoints(0) = New LeadPoint(94, 94)
   PolyPoints(1) = New LeadPoint(306, 43)
   PolyPoints(2) = New LeadPoint(318, 237)
   PolyPoints(3) = New LeadPoint(98, 237)

   'Prepare the command
   Dim command As KeyStoneCommand = New KeyStoneCommand()

   command.PolygonPoints = PolyPoints
   'Apply 
   command.Run(image)

   codecs.Save(command.TransformedBitmap, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), image.OriginalFormat, image.BitsPerPixel)

End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

      
public void KeyStoneCommandExample()
{
    RasterCodecs codecs = new RasterCodecs();
    codecs.ThrowExceptionsOnInvalidImages = true;
    //Load an image
    RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"));

    LeadPoint[] PolyPoints = new LeadPoint[4];

    //The four corners of the polygon
    PolyPoints[0]= new LeadPoint(94, 94);
    PolyPoints[1]= new LeadPoint(306, 43);
    PolyPoints[2]= new LeadPoint(318, 237);
    PolyPoints[3]= new LeadPoint(98, 237);

    //Prepare the command
    KeyStoneCommand command = new KeyStoneCommand();

    command.PolygonPoints = PolyPoints;
    //Apply 
    command.Run(image);

    codecs.Save(command.TransformedBitmap, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), image.OriginalFormat, image.BitsPerPixel);
}

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

Target Platforms

Reference

KeyStoneCommand Members
Leadtools.ImageProcessing.Core Namespace
PerspectiveDeskewCommand Class
ManualPerspectiveDeskewCommand Class
UnWarpCommand Class