HolePunchRemove Method

Finds and removes hole punches. This operation is available in the Document/Medical Toolkits.

Syntax

Visual Basic
C#
Objective-C
Java
C++

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

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

'Usage
 
Dim instance As IDocumentProcessingService
Dim request As HolePunchRemoveRequest
Dim value As DocumentResponse
 
value = instance.HolePunchRemove(request)

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

Parameters

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

Return Value

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

Remarks

This operation detects and removes hole punches that are common in scanned documents.
This operation works only on 1-bit black and white images.
Hole punch configurations may consist of 2 or more holes.
If a region is selected, only the selected region will be changed by this operation. 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.
Before calling this operation, ensure that the hole punch is free of any other stray marks. If you do not, the hole will not be recognized. Use the LineRemove operation to remove any horizontal or vertical lines from the image. Use the other Document Cleanup operations to remove other imaging artifacts such as dots, blobs, borders, inverted text, bumps and nicks. This will have the added benefit of making your image smaller when compressed.

For example, the following image must have the vertical line removed:

Once the image has been cleaned, as shown in the following figure, the hole punch can be removed:

For more information, refer to Cleaning Up 1-Bit Images.

Example

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 HolePunchRemoveExample()
   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 HolePunchRemoveRequest = New HolePunchRemoveRequest()

   request.ConvertOptions = convertOptions
   request.RegionData = Nothing
   request.Flags = HolePunchRemoveCommandFlags.GetRegion Or HolePunchRemoveCommandFlags.UseDpi Or HolePunchRemoveCommandFlags.UseCount Or HolePunchRemoveCommandFlags.UseLocation
   request.MinimumHoleCount = 2
   request.MaximumHoleCount = 4
   request.MinimumHoleWidth = 0
   request.MinimumHoleHeight = 0
   request.MaximumHoleWidth = 0
   request.MaximumHoleHeight = 0
   request.Location = HolePunchRemoveCommandLocation.Left

   Dim response As DocumentResponse = client.HolePunchRemove(request)
   If Not response.Destination Is Nothing Then
      If TypeOf response.Destination Is RawBinaryData Then
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "HolePunchRemove.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, "HolePunchRemove.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, "HolePunchRemoveRegion.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 HolePunchRemoveExample()
{
   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;

   HolePunchRemoveRequest request = new HolePunchRemoveRequest();

   request.ConvertOptions = convertOptions;
   request.RegionData = null;
   request.Flags = HolePunchRemoveCommandFlags.GetRegion | HolePunchRemoveCommandFlags.UseDpi | HolePunchRemoveCommandFlags.UseCount | HolePunchRemoveCommandFlags.UseLocation;
   request.MinimumHoleCount = 2;
   request.MaximumHoleCount = 4;
   request.MinimumHoleWidth = 0;
   request.MinimumHoleHeight = 0;
   request.MaximumHoleWidth = 0;
   request.MaximumHoleHeight = 0;
   request.Location = HolePunchRemoveCommandLocation.Left;

   DocumentResponse response = client.HolePunchRemove(request);
   if (response.Destination != null)
   {
      if (response.Destination is RawBinaryData)
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "HolePunchRemove.bmp"), (response.Destination as RawBinaryData).Data);
   }

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

Requirements

Target Platforms

Reference

IDocumentProcessingService Interface
IDocumentProcessingService Members