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DynamicBinary Method

Summary

Converts an image into a black and white image without changing its bits per pixel by using a local threshold value for each pixel of the image. This operation is useful for pre-processing images for the purpose of improving barcode recognition results.

Syntax

C#
VB
C++
[FaultContractAttribute(System.Type)] 
[OperationContractAttribute(Action="DynamicBinary", 
   AsyncPattern=false, 
   IsOneWay=false, 
   IsInitiating=true, 
   IsTerminating=false)] 
public CommandResponse DynamicBinary( 
   DynamicBinaryRequest request 
) 
  
<OperationContractAttribute("DynamicBinary")> 
<FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault,  
   Action="",  
   Name="",  
   Namespace="",  
   ProtectionLevel=ProtectionLevel.None,  
   HasProtectionLevel=False)> 
Function DynamicBinary( _ 
   ByVal request As Leadtools.Services.Imageprocessing.Datacontracts.DynamicBinaryRequest _ 
) As Leadtools.Services.Imageprocessing.Datacontracts.CommandResponse 
[OperationContractAttribute("DynamicBinary")] 
[FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault,  
   Action="",  
   Name="",  
   Namespace="",  
   ProtectionLevel=ProtectionLevel.None,  
   HasProtectionLevel=false)] 
Leadtools.Services.Imageprocessing.Datacontracts.CommandResponse^ DynamicBinary(  
   Leadtools.Services.Imageprocessing.Datacontracts.DynamicBinaryRequest^ request 
)  

Parameters

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

Return Value

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

Remarks
  • This operation converts an image into a black and white image without changing its bits per pixel.
  • Each pixel is compared to a dynamically-calculated threshold. If the intensity of the pixel is higher (that is, the pixel is brighter) than the dynamic threshold, the pixel will be set to white. If the intensity of the pixel is lower (that is, the pixel is darker) than the dynamic threshold, the pixel will be set to black.
  • Here are some hints on using this operation:
  • Increasing the Leadtools.Services.ImageProcessing.DataContracts.DynamicBinaryRequest.LocalContrast property increases the number of pixels that use the global threshold. This tends to preserve the general aspect of the image and reduces the improvement in the areas with many details. Reducing the LocalContrast property, increases the contrast in areas with many details.
  • Increasing the Leadtools.Services.ImageProcessing.DataContracts.DynamicBinaryRequest.Dimension property increases the area used for local contrast. This makes the color changes smoother.
  • This operation is good as a prerequisite for converting scanned images to 1-bit, because it uses one threshold for background and another for text.
  • This operation 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 operation does not support signed data images.
  • This operation does not support 32-bit grayscale images.

Use the AutoBinary when you simply want to apply binary segmentation to the bitmap using an automatically calculated threshold based on a two-peak method of statistical analysis on its histogram. Use the AutoBinary to convert an image into a black and white image without changing its bits per pixel.

Example

C#
VB
using Leadtools.Services; 
 
public void DynamicBinaryExample() 
{ 
   ColorProcessingServiceClient client = new ColorProcessingServiceClient(); 
 
   RawBinaryData sourceBinaryData = new RawBinaryData(); 
   sourceBinaryData.Data = File.ReadAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")); 
 
   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; 
 
   DynamicBinaryRequest request = new DynamicBinaryRequest(); 
   request.ConvertOptions = convertOptions; 
   request.RegionData = null; 
   request.Dimension = 8; 
   request.LocalContrast = 16; 
 
   CommandResponse response = client.DynamicBinary(request); 
   if (response.Destination != null) 
   { 
      if (response.Destination is RawBinaryData) 
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "DynamicBinary.bmp"), (response.Destination as RawBinaryData).Data); 
   } 
 
   client.Close(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
} 
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 DynamicBinaryExample() 
   Dim client As ColorProcessingServiceClient = New ColorProcessingServiceClient() 
 
   Dim sourceBinaryData As RawBinaryData = New RawBinaryData() 
   sourceBinaryData.Data = File.ReadAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")) 
 
   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 DynamicBinaryRequest = New DynamicBinaryRequest() 
   request.ConvertOptions = convertOptions 
   request.RegionData = Nothing 
   request.Dimension = 8 
   request.LocalContrast = 16 
 
   Dim response As CommandResponse = client.DynamicBinary(request) 
   If Not response.Destination Is Nothing Then 
      If TypeOf response.Destination Is RawBinaryData Then 
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "DynamicBinary.bmp"), (TryCast(response.Destination, RawBinaryData)).Data) 
      End If 
   End If 
 
   client.Close() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

Requirements

Target Platforms

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