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InvertedText Method
See Also  Example
Leadtools.Services.ImageProcessing.ServiceContracts Namespace > IDocumentProcessingService Interface : InvertedText Method



request
A DataContractAttribute containing the data that will be used in this InvertedText operation.
request
A DataContractAttribute containing the data that will be used in this InvertedText operation.
Finds and modifies areas of inverted text in a 1-bit black and white image. This operation is available in the Document/Medical Toolkits.

Syntax

Visual Basic (Declaration) 
<OperationContractAttribute("InvertedText")>
<FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault, 
   Action="", 
   Name="", 
   Namespace="", 
   HasProtectionLevel=False)>
Overridable Function InvertedText( _
   ByVal request As InvertedTextRequest _
) As DocumentResponse
Visual Basic (Usage)Copy Code
Dim instance As IDocumentProcessingService
Dim request As InvertedTextRequest
Dim value As DocumentResponse
 
value = instance.InvertedText(request)
C# 
[OperationContractAttribute("InvertedText")]
[FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault, 
   Action="", 
   Name="", 
   Namespace="", 
   HasProtectionLevel=false)]
virtual DocumentResponse InvertedText( 
   InvertedTextRequest request
)
C++/CLI 
[OperationContractAttribute("InvertedText")]
[FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault, 
   Action="", 
   Name="", 
   Namespace="", 
   HasProtectionLevel=false)]
virtual DocumentResponse InvertedText( 
   InvertedTextRequest request
)

Parameters

request
A DataContractAttribute containing the data that will be used in this InvertedText operation.

Return Value

A DataContractAttribute containing the modified image resulting from the InvertedText operation.

Example

Visual BasicCopy Code
Public Sub InvertedTextExample()
   Dim client As DocumentProcessingServiceClient = New DocumentProcessingServiceClient()
   Dim sourceBinaryData As RawBinaryData = New RawBinaryData()
   sourceBinaryData.Data = File.ReadAllBytes(LeadtoolsExamples.Common.ImagesPath.Path & "clean.tif")

   Dim convertOptions As RasterConvertOptions = New RasterConvertOptions()

   convertOptions.Source = sourceBinaryData
   convertOptions.Destination = Nothing
   convertOptions.Format = RasterImageFormat.Bmp
   convertOptions.FirstPage = 1
   convertOptions.LastPage = 1
   convertOptions.BitsPerPixel = 24
   convertOptions.QualityFactor = 2

   Dim request As InvertedTextRequest = New InvertedTextRequest()

   request.ConvertOptions = convertOptions
   request.RegionData = Nothing
   request.Flags = InvertedTextCommandFlags.UseDpi Or InvertedTextCommandFlags.GetRegion
   request.MinimumInvertWidth = 5000
   request.MinimumInvertHeight = 500
   request.MinimumBlackPercent = 70
   request.MaximumBlackPercent = 95

   Dim response As DocumentResponse = client.InvertedText(request)
   If Not response.Destination Is Nothing Then
      If TypeOf response.Destination Is RawBinaryData Then
         File.WriteAllBytes(LeadtoolsExamples.Common.ImagesPath.Path & "InvertedText.bmp", (TryCast(response.Destination, RawBinaryData)).Data)
      End If
   End If

   If Not response.Region Is Nothing Then
      Dim bitmap As Bitmap = New Bitmap(LeadtoolsExamples.Common.ImagesPath.Path & "InvertedText.bmp")
      Dim graphics As Graphics = graphics.FromImage(bitmap)

      Dim region1 As Region = New Region()
      Dim regionData As RegionData = region1.GetRegionData()
      regionData.Data = response.Region.Data

      Dim region2 As Region = New Region(regionData)

      graphics.FillRegion(Brushes.Red, region2)

      bitmap.Save(LeadtoolsExamples.Common.ImagesPath.Path & "InvertedTextRegion.bmp")

      region2.Dispose()
      region1.Dispose()
      bitmap.Dispose()
      graphics.Dispose()
   End If

   client.Close()
End Sub
C#Copy Code
public void InvertedTextExample() 
{ 
   DocumentProcessingServiceClient client = new DocumentProcessingServiceClient(); 
   RawBinaryData sourceBinaryData = new RawBinaryData(); 
   sourceBinaryData.Data = File.ReadAllBytes(LeadtoolsExamples.Common.ImagesPath.Path + "clean.tif"); 
 
   RasterConvertOptions convertOptions = new RasterConvertOptions(); 
 
   convertOptions.Source = sourceBinaryData; 
   convertOptions.Destination = null; 
   convertOptions.Format = RasterImageFormat.Bmp; 
   convertOptions.FirstPage = 1; 
   convertOptions.LastPage = 1; 
   convertOptions.BitsPerPixel = 24; 
   convertOptions.QualityFactor = 2; 
 
   InvertedTextRequest request = new InvertedTextRequest(); 
 
   request.ConvertOptions = convertOptions; 
   request.RegionData = null; 
   request.Flags = InvertedTextCommandFlags.UseDpi | InvertedTextCommandFlags.GetRegion; 
   request.MinimumInvertWidth = 5000; 
   request.MinimumInvertHeight = 500; 
   request.MinimumBlackPercent = 70; 
   request.MaximumBlackPercent = 95; 
 
   DocumentResponse response = client.InvertedText(request); 
   if (response.Destination != null) 
   { 
      if (response.Destination is RawBinaryData) 
         File.WriteAllBytes(LeadtoolsExamples.Common.ImagesPath.Path + "InvertedText.bmp", (response.Destination as RawBinaryData).Data); 
   } 
 
   if (response.Region != null) 
   { 
      Bitmap bitmap = new Bitmap(LeadtoolsExamples.Common.ImagesPath.Path + "InvertedText.bmp"); 
      Graphics graphics = Graphics.FromImage(bitmap); 
 
      Region region1 = new Region(); 
      RegionData regionData = region1.GetRegionData(); 
      regionData.Data = response.Region.Data; 
 
      Region region2 = new Region(regionData); 
 
      graphics.FillRegion(Brushes.Red, region2); 
 
      bitmap.Save(LeadtoolsExamples.Common.ImagesPath.Path + "InvertedTextRegion.bmp"); 
 
      region2.Dispose(); 
      region1.Dispose(); 
      bitmap.Dispose(); 
      graphics.Dispose(); 
   } 
 
   client.Close(); 
}

Remarks

  • This operation finds and modifies areas of inverted text that are common in scanned text documents. Below is an example of inverted text:


    Modifying the area of inverted text yields the following:


  • This operation works only on 1-bit black and white images.
  • If a region is selected, only the selected region will be changed by this method. If no region is selected, the whole image will be processed.
  • This operation does not support signed data images.
  • This operation does not support 32-bit grayscale images.
For more information, refer to Cleaning Up 1-Bit Images.

Requirements

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

See Also

Applications developed with LEADTOOLS WCF components require runtime licenses. Server licensing is required for applications on a server. For more information, refer to: Imaging Pro/Document/Medical Features