InvertedText Method

Visual Basic
C#
Objective-C
Java
C++

[FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault, 
   Action="", 
   Name="", 
   Namespace="", 
   ProtectionLevel=ProtectionLevel.None, 
   HasProtectionLevel=false)]
[OperationContractAttribute("InvertedText")]
DocumentResponse InvertedText( 
   InvertedTextRequest request
)

'Declaration
 
<FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault, 
   Action="", 
   Name="", 
   Namespace="", 
   ProtectionLevel=ProtectionLevel.None, 
   HasProtectionLevel=False)>
<OperationContractAttribute("InvertedText")>
Function InvertedText( _
   ByVal request As InvertedTextRequest _
) As DocumentResponse

'Usage
 
Dim instance As IDocumentProcessingService
Dim request As InvertedTextRequest
Dim value As DocumentResponse
 
value = instance.InvertedText(request)

[FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault, 
   Action="", 
   Name="", 
   Namespace="", 
   ProtectionLevel=ProtectionLevel.None, 
   HasProtectionLevel=false)]
[OperationContractAttribute("InvertedText")]
DocumentResponse^ InvertedText( 
   InvertedTextRequest^ request
)

Parameters

request: A System.Runtime.Serialization.DataContractAttribute containing the data that will be used in this InvertedText operation.

Return Value

A System.Runtime.Serialization.DataContractAttribute containing the modified image resulting from the InvertedText operation.

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.

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

Copy Code

Imports Leadtools.Services
Imports leadtools.services.datacontracts._2009._01
Imports leadtools.services.raster.datacontracts._2009._01
Imports leadtools.services.imageprocessing.datacontracts._2009._01

Public Sub InvertedTextExample()
   Dim client As DocumentProcessingServiceClient = New DocumentProcessingServiceClient()
   Dim sourceBinaryData As RawBinaryData = New RawBinaryData()
   sourceBinaryData.Data = File.ReadAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "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(Path.Combine(LEAD_VARS.ImagesDir, "InvertedText.bmp"), (TryCast(response.Destination, RawBinaryData)).Data)
      End If
   End If

   If Not response.Region Is Nothing Then
      Dim bitmap As Bitmap = New Bitmap(Path.Combine(LEAD_VARS.ImagesDir, "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(Path.Combine(LEAD_VARS.ImagesDir, "InvertedTextRegion.bmp"))

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

   client.Close()
End Sub

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

using Leadtools.Services;
using leadtools.services.datacontracts._2009._01;
using leadtools.services.raster.datacontracts._2009._01;
using leadtools.services.imageprocessing.datacontracts._2009._01;

public void InvertedTextExample()
{
   DocumentProcessingServiceClient client = new DocumentProcessingServiceClient();
   RawBinaryData sourceBinaryData = new RawBinaryData();
   sourceBinaryData.Data = File.ReadAllBytes(Path.Combine(LEAD_VARS.ImagesDir,"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(Path.Combine(LEAD_VARS.ImagesDir,"InvertedText.bmp"), (response.Destination as RawBinaryData).Data);
   }

   if (response.Region != null)
   {
      Bitmap bitmap = new Bitmap(Path.Combine(LEAD_VARS.ImagesDir, "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(Path.Combine(LEAD_VARS.ImagesDir, "InvertedTextRegion.bmp"));

      region2.Dispose();
      region1.Dispose();
      bitmap.Dispose();
      graphics.Dispose();
   }

   client.Close();
}

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

Target Platforms

Reference

IDocumentProcessingService Interface
IDocumentProcessingService Members