ManualPerspectiveDeskewCommand Class

Summary

Corrects the view perspective.

Syntax

Objective-C

C++

Java

public class ManualPerspectiveDeskewCommand : RasterCommand

Public Class ManualPerspectiveDeskewCommand  
   Inherits RasterCommand

@interface LTManualPerspectiveDeskewCommand : LTRasterCommand

public class ManualPerspectiveDeskewCommand extends RasterCommand

public ref class ManualPerspectiveDeskewCommand : public RasterCommand

Remarks

The ManualPerspectiveDeskewCommand can change the specified image. To keep the original image unchanged, use this function on a copy.
Typically, this command is used as a step in preprocessing images from digital cameras. It changes the image based on a view perspective equation, taking the depth of the objects into account as well as their relative dimensions.
It is best to choose input points that are far apart from each other.
Use the ManualPerspectiveDeskewCommand, PerspectiveDeskewCommand or KeyStoneCommand if there is a planar deformation along all three axes. Use the UnWarpCommand if there is a cylindrical deformation. Use the DeskewCommand if there is deformation along the x-axis and y-axes.
Use the Run method to fix the distorted image. Obtain the deskewed image from the OutputImage property.
This function supports 24-bit and 36-bit color images and 8-bit and 16-bit grayscale images. Support for 16-bit grayscale is available in the Document/Medical Imaging toolkits. This command supports signed/unsigned images.
For more information, refer to Deskewing.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void ManualPerspectiveDeskewCommandExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   //Load an image 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "PerspectiveDeskew.jpg")); 
 
   LeadPoint[] PolyPoints = new LeadPoint[4]; 
   LeadPoint[] MappingPoints = new LeadPoint[4]; 
 
   //The four corners of the polygon 
   PolyPoints[0] = new LeadPoint(131, 193); 
   PolyPoints[1] = new LeadPoint(456, 151); 
   PolyPoints[2] = new LeadPoint(535, 282); 
   PolyPoints[3] = new LeadPoint(124, 354); 
 
   //Prepare the command 
   ManualPerspectiveDeskewCommand command = new ManualPerspectiveDeskewCommand(); 
 
   command.InPoints = PolyPoints; 
 
   MappingPoints[0] = new LeadPoint(0, 0); 
   MappingPoints[1] = new LeadPoint(610, 0); 
   MappingPoints[2] = new LeadPoint(610, 421); 
   MappingPoints[3] = new LeadPoint(0, 421); 
 
   command.MappingPoints = MappingPoints; 
 
   //Apply  
   command.Run(image); 
 
   codecs.Save(command.OutputImage, 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"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
 
Public Sub ManualPerspectiveDeskewCommandExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   'Load an image 
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "PerspectiveDeskew.jpg")) 
 
   'Dim PolyPoints As List(Of LeadPoint) = New List(Of LeadPoint)() 
   Dim PolyPoints() As LeadPoint = New LeadPoint(4) {} 
   Dim MappingPoints() As LeadPoint = New LeadPoint(4) {} 
 
   'The four corners of the polygon 
   PolyPoints(0) = New LeadPoint(131, 193) 
   PolyPoints(1) = New LeadPoint(456, 151) 
   PolyPoints(2) = New LeadPoint(535, 282) 
   PolyPoints(3) = New LeadPoint(124, 354) 
 
   'Prepare the command 
   Dim command As ManualPerspectiveDeskewCommand = New ManualPerspectiveDeskewCommand() 
 
   command.InPoints = PolyPoints 
 
   MappingPoints(0) = New LeadPoint(0, 0) 
   MappingPoints(1) = New LeadPoint(610, 0) 
   MappingPoints(2) = New LeadPoint(610, 421) 
   MappingPoints(3) = New LeadPoint(0, 421) 
 
   command.MappingPoints = MappingPoints 
 
 
   'Apply  
   command.Run(image) 
 
   codecs.Save(command.OutputImage, 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

Requirements

Target Platforms

Reference

ManualPerspectiveDeskewCommand Members

Leadtools.ImageProcessing.Core Namespace

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Help Version 20.0.2020.4.3

Leadtools.ImageProcessing.Core Assembly

Introduction

Getting Started

Namespaces

Leadtools.ImageProcessing.Core Namespace

Assemblies