Public Shared Function GetTransformationParameters( _
   ByVal image As RasterImage, _
   ByVal referencePoints() As Point, _
   ByVal transformedPoints() As Point _
) As TransformationParameters

Visual Basic (Usage)	Copy Code
Dim image As RasterImage Dim referencePoints() As Point Dim transformedPoints() As Point Dim value As TransformationParameters   value = CoreUtilities.GetTransformationParameters(image, referencePoints, transformedPoints)

public static TransformationParameters GetTransformationParameters( 
   RasterImage image,
   Point[] referencePoints,
   Point[] transformedPoints
)

public:
static TransformationParameters GetTransformationParameters( 
   RasterImage image,
   array<Point>^ referencePoints,
   array<Point>^ transformedPoints
) 

Parameters

image

RasterImage object that references the transformed image.

referencePoints

Pointer to an array of reference points. These points represent the center of mass points for the registration marks in the reference image. You have to provide this information.

transformedPoints

Pointer to an array of transformed points. These points are the center of mass points in the image. You have to provide this information.

Return Value

This example computes the translation parameters. The example makes the assumption that you have saved the position of the registration marks of the reference image in a file. You should modify this example and replace the manual assignment of the rmData with your own code to load the reference registration mark data before testing this example.

Visual Basic

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Public Sub GetTransformationParametersExample()    RasterCodecs.Startup()    Dim codecs As New RasterCodecs()    codecs.ThrowExceptionsOnInvalidImages = True    Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg")    ' Prepare the command    Dim rmData(2) As SearchRegistrationMarksCommandData    ' Mark1    rmData(0) = New SearchRegistrationMarksCommandData    rmData(0).Rectangle = New Rectangle(680, 20, 941 - 680, 218 - 20)    Dim pt0(0) As Point    rmData(0).MarkDetectedPoints = pt0    rmData(0).Width = 31    rmData(0).Height = 29    rmData(0).Type = RegistrationMarkCommandType.TShape    rmData(0).MinimumScale = 90    rmData(0).MaximumScale = 110    rmData(0).SearchMarkCount = 1    ' Mark2    rmData(1) = New SearchRegistrationMarksCommandData    rmData(1).Rectangle = New Rectangle(665, 790, 899 - 665, 961 - 790)    Dim pt1(0) As Point    rmData(1).MarkDetectedPoints = pt1    rmData(1).Width = 31    rmData(1).Height = 29    rmData(1).Type = RegistrationMarkCommandType.TShape    rmData(1).MinimumScale = 90    rmData(1).MaximumScale = 110    rmData(1).SearchMarkCount = 1    ' Mark3    rmData(2) = New SearchRegistrationMarksCommandData    rmData(2).Rectangle = New Rectangle(7, 1073, 298 - 7, 1246 - 1073)    Dim pt2(0) As Point    rmData(2).MarkDetectedPoints = pt2    rmData(2).Width = 31    rmData(2).Height = 29    rmData(2).Type = RegistrationMarkCommandType.TShape    rmData(2).MinimumScale = 90    rmData(2).MaximumScale = 110    rmData(2).SearchMarkCount = 1    Dim command1 As New SearchRegistrationMarksCommand(rmData)    command1.Run(leadImage)    If ((rmData(2).MarkDetectedCount <> 1) OrElse (rmData(1).MarkDetectedCount <> 1) OrElse (rmData(0).MarkDetectedCount <> 1)) Then       Return    End If    Dim original() As Point = _    { _       New Point(81400, 11300), _       New Point(78600, 87400), _       New Point(14300, 115400) _    }    Dim detected() As Point = _    { _       rmData(0).MarkDetectedPoints(0), _       rmData(1).MarkDetectedPoints(0), _       rmData(2).MarkDetectedPoints(0) _    }    ' Find center of mass for detected registration marks in the transformed image    Dim transformed() As Point = CoreUtilities.GetRegistrationMarksCenterMass(leadImage, detected)    ' Find transformation parameters    Dim parameters As TransformationParameters = CoreUtilities.GetTransformationParameters(leadImage, original, transformed)    ' Apply transformatin parameters to correct the image    Dim applyCommand As New ApplyTransformationParametersCommand(parameters.XTranslation, parameters.YTranslation, parameters.Angle, parameters.XScale, parameters.YScale, ApplyTransformationParametersCommandFlags.Normal)    applyCommand.Run(leadImage)    RasterCodecs.Shutdown() End Sub

C#

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public void GetTransformationParametersExample()  {     // Load an image     RasterCodecs.Startup();     RasterCodecs codecs = new RasterCodecs();     codecs.ThrowExceptionsOnInvalidImages = true;       RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg");       // Prepare the command     SearchRegistrationMarksCommandData[] rmData = new SearchRegistrationMarksCommandData[3];       //Mark1     rmData[0] = new SearchRegistrationMarksCommandData();     rmData[0].Rectangle = new Rectangle(680, 20, 941 - 680, 218 - 20);     rmData[0].MarkDetectedPoints = new Point[1];     rmData[0].Width = 31;     rmData[0].Height = 29;     rmData[0].Type = RegistrationMarkCommandType.TShape;     rmData[0].MinimumScale = 90;     rmData[0].MaximumScale = 110;     rmData[0].SearchMarkCount = 1;       //Mark2     rmData[1] = new SearchRegistrationMarksCommandData();     rmData[1].Rectangle = new Rectangle(665, 790, 899 - 665, 961 - 790);     rmData[1].MarkDetectedPoints = new Point[1];     rmData[1].Width = 31;     rmData[1].Height = 29;     rmData[1].Type = RegistrationMarkCommandType.TShape;     rmData[1].MinimumScale = 90;     rmData[1].MaximumScale = 110;     rmData[1].SearchMarkCount = 1;       //Mark3     rmData[2] = new SearchRegistrationMarksCommandData();     rmData[2].Rectangle = new Rectangle(7, 1073, 298 - 7, 1246 - 1073);     rmData[2].MarkDetectedPoints = new Point[1];     rmData[2].Width = 31;     rmData[2].Height = 29;     rmData[2].Type = RegistrationMarkCommandType.TShape;     rmData[2].MinimumScale = 90;     rmData[2].MaximumScale = 110;     rmData[2].SearchMarkCount = 1;     SearchRegistrationMarksCommand command1 = new SearchRegistrationMarksCommand(rmData);     command1.Run(image);     if ((rmData[2].MarkDetectedCount != 1) || (rmData[1].MarkDetectedCount != 1) || (rmData[0].MarkDetectedCount != 1))        return;       Point[] original =     {        new Point(81400, 11300),        new Point(78600, 87400),        new Point(14300, 115400)     };       Point[] detected =     {        rmData[0].MarkDetectedPoints[0],        rmData[1].MarkDetectedPoints[0],        rmData[2].MarkDetectedPoints[0]     };       //Find center of mass for detected registration marks in the transformed image     Point[] transformed = CoreUtilities.GetRegistrationMarksCenterMass(image, detected);     //Find transformation parameters     TransformationParameters parameters = CoreUtilities.GetTransformationParameters(image, original, transformed);     //Apply transformation parameters to correct the image     ApplyTransformationParametersCommand applyCommand = new ApplyTransformationParametersCommand(parameters.XTranslation, parameters.YTranslation, parameters.Angle, parameters.XScale, parameters.YScale, ApplyTransformationParametersCommandFlags.Normal);     applyCommand.Run(image);       RasterCodecs.Shutdown();  }

• This method detects transformation parameters of the transformed image by comparing it with the reference image. The number of reference and detected points must be three.
• Use GetRegistrationMarksCenterMass to fill the referencePoints array with the points representing the center of masses for each of the reference marks from the reference image.
• Fill the transformedPoints array by performing the following steps:
  
  
  • Use SearchRegistrationMarksCommand to find the new positions for the reference marks.
  • Using GetRegistrationMarksCenterMass to fill the transformedPoints array with points representing the center of masses for each of the transformed reference marks.
• The properties of TransformationParameters which are: XTranslation, YTranslation, Angle, XScale and YScale are internally divided by 100. For example, an Angle of 500 would mean to rotate the image 5 degrees clockwise.
• The results of this method must be sent without any modification to the ApplyTransformationParameters method in order to correct the image.
• If you want to correct the image yourself, you have to perform the inverse operations in this order:
  
  
  • Shift the image by (-TransformationParameters.XTranslation / 100, -TransformationParameters.YTranslation / 100) using CombineCommand
  • Rotate without resizing by - (TransformationParameters.Angle)
  • Resize using scaling factors of (100 / TransformationParameters.XScale, 100 / TransformationParameters.YScale) using SizeCommand or ResizeCommand.
• If you simply want to automatically straighten the image, use the DeskewCommand.
• This method 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 signed images.

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Reference