EnablePreprocessing Property

Summary

Enable applying auto segmentation, deep auto pre-processing to the image and then re-scanning If no barcodes of this symbology are found.

Syntax

Objective-C

C++/CLI

Python

public bool EnablePreprocessing { get; set; }

@property (nonatomic, assign) BOOL enablePreprocessing;

public:  
   property bool EnablePreprocessing 
   { 
      bool get() 
      void set(bool value) 
   }

EnablePreprocessing # get and set (MicroPDF417BarcodeReadOptions)

Property Value

true to apply auto segmentation and deep auto pre-processing to the image then re-scanning if no barcodes of this symbology is found, otherwise; false. The default value is false.

Remarks

When reading 2D barcodes, LEADTOOLS can perform internal auto preprocessing and segmentation on the image and try again if the engine cannot detect the barcode required. This may take extra processing and increase the barcode detection time. Therefore, it is best to set EnablePreprocessing to true only in certain situations, as follows:

The application is reading barcodes of this type exclusively (for example, a dedicated barcode reader is being used). In this case, reading the barcodes is always more important than recognition speed.
The application uses barcode detection on a server. In this case, the time spent on the actual barcode detection is most probably less than the time required to send the image to the server and get the result back due to network latency. Thus it makes sense to enable pre-processing in this situation.
The images provided have a small resolution (DPI) or are known to come from a source that does not always provide clean images (for example, a Fax machine or a Scanner). Enabling pre-processing here ensures that the barcodes can be read regardless of the quality of the input image.

The LEADTOOLS .NET C# Barcode demos leave pre-processing disabled by default. If the engine tries to read a barcode of this type but cannot find it, it will then ask the user if EnablePreprocessing should be enabled and reading be retried. An approach like that (or an automated one: Read. If failure, enable and read again) can also be used.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
 
 
public void MicroPDF417Barcode_Example() 
{ 
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyMicroPDF417Barcodes.tif"); 
 
   BarcodeEngine engine = new BarcodeEngine(); 
 
   // Create the image to write the barcodes to 
   int resolution = 300; 
   using (RasterImage image = RasterImage.Create((int)(8.5 * resolution), (int)(11.0 * resolution), 1, resolution, RasterColor.FromKnownColor(RasterKnownColor.White))) 
   { 
      // Write two MicroPDF417 barcodes 
      WriteBarcode(engine.Writer, image, "DATA1", MicroPDF417BarcodeSymbolSize.Smallest, true); 
      WriteBarcode(engine.Writer, image, "DATA2", MicroPDF417BarcodeSymbolSize.Size44X4, false); 
 
      // Save the image 
      using (RasterCodecs codecs = new RasterCodecs()) 
      { 
         codecs.Save(image, imageFileName, RasterImageFormat.CcittGroup4, 1); 
      } 
   } 
 
   // Now read the barcodes again 
   using (RasterCodecs codecs = new RasterCodecs()) 
   { 
      using (RasterImage image = codecs.Load(imageFileName)) 
      { 
         ReadBarcodes(engine.Reader, image); 
      } 
   } 
} 
 
private void WriteBarcode(BarcodeWriter writer, RasterImage image, string value, MicroPDF417BarcodeSymbolSize symbolSize, bool topLeft) 
{ 
   // Create the barcode data 
   MicroPDF417BarcodeData barcode = new MicroPDF417BarcodeData(); 
   barcode.Value = value; 
   barcode.DataCode = 0; 
   barcode.Symbology = BarcodeSymbology.MicroPDF417; 
 
   // We will use the alignment to position the barcodes, so use all of the image 
   barcode.Bounds = new LeadRect(0, 0, image.ImageWidth, image.ImageHeight); 
 
   // Set the write options 
   MicroPDF417BarcodeWriteOptions options = new MicroPDF417BarcodeWriteOptions(); 
 
   if (topLeft) 
   { 
      options.HorizontalAlignment = BarcodeAlignment.Near; 
      options.VerticalAlignment = BarcodeAlignment.Near; 
   } 
   else 
   { 
      options.HorizontalAlignment = BarcodeAlignment.Far; 
      options.VerticalAlignment = BarcodeAlignment.Far; 
   } 
 
   options.UseMode128Emulation = false; 
   options.IsLinked = false; 
   options.EnableGroupMode = false; 
   options.XModule = 30; 
   options.XModuleAspectRatio = 3; 
   options.LimitByRowsAndColumns = true; 
   options.SymbolSize = symbolSize; 
 
   // Write it 
   Console.WriteLine("Writing barcode with symbol size: {0} and Data: {1}", symbolSize, value); 
   writer.WriteBarcode(image, barcode, options); 
} 
 
private void ReadBarcodes(BarcodeReader reader, RasterImage image) 
{ 
   // Setup read options 
   MicroPDF417BarcodeReadOptions options = new MicroPDF417BarcodeReadOptions(); 
   options.SearchDirection = BarcodeSearchDirection.Horizontal; 
   options.EnableDoublePass = false; 
   options.ReadMode = MicroPDF417BarcodeReadMode.Mode0; 
   options.ReadOptionalMacroFileNameField = false; 
   options.ReadOptionalMacroSegmentCountField = false; 
   options.ReadOptionalMacroTimestampField = false; 
   options.ReadOptionalMacroSenderField = false; 
   options.ReadOptionalMacroAddresseeField = false; 
   options.ReadOptionalMacroFileSizeField = false; 
   options.ReadOptionalMacroChecksumField = false; 
   options.ReadOptionalMacro79AndAZField = false; 
   options.EnableDoublePassIfSuccess = true; 
   options.EnablePreprocessing = true; 
 
   Console.WriteLine("Reading Barcodes"); 
   BarcodeData[] barcodes = reader.ReadBarcodes(image, LeadRect.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.MicroPDF417 }, new BarcodeReadOptions[] { options }); 
   Console.WriteLine("{0} barcodes found:", barcodes.Length); 
   foreach (MicroPDF417BarcodeData barcode in barcodes) 
   { 
      Console.WriteLine(" At {0} data: {1} and symbology: {2}", barcode.Bounds, barcode.Value, barcode.Symbology); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.IOException; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.barcode.*; 
import leadtools.codecs.*; 
 
 
public void microPDF417BarcodeExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   String imageFileName = combine(LEAD_VARS_IMAGES_DIR, "MicroPDF417Barcode.tif"); 
   String outputFileName = combine(LEAD_VARS_IMAGES_DIR, "Result.tif"); 
   RasterCodecs codecs = new RasterCodecs(); 
   BarcodeEngine engine = new BarcodeEngine(); 
 
   // Create the image to write the barcodes to 
   int resolution = 300; 
   RasterImage image = RasterImage.create( 
      (int) (8.5 * resolution),  
      (int) (11.0 * resolution),  
      1,  
      resolution, 
      RasterColor.fromKnownColor(RasterKnownColor.WHITE) 
   ); 
 
   // Write two MicroPDF417 barcodes 
   writeBarcode(engine.getWriter(), image, "DATA1", MicroPDF417BarcodeSymbolSize.SMALLEST, true); 
   writeBarcode(engine.getWriter(), image, "DATA2", MicroPDF417BarcodeSymbolSize.SIZE44X4, false); 
 
   // Save the image 
   codecs.save(image, imageFileName, RasterImageFormat.CCITT_GROUP4, 1); 
 
   // Now read the barcodes again 
   image = codecs.load(imageFileName); 
   codecs.save(image, outputFileName, RasterImageFormat.TIF, 0); 
   readBarcodes(engine.getReader(), image); 
 
   assertTrue("file unsuccessfully saved to " + outputFileName, (new File(outputFileName)).exists()); 
   System.out.printf("File saved successfully to %s%n", outputFileName); 
} 
 
// Create the barcode data 
private void writeBarcode(BarcodeWriter writer, RasterImage image, String value, MicroPDF417BarcodeSymbolSize symbolSize, boolean topLeft) { 
   MicroPDF417BarcodeData barcode = new MicroPDF417BarcodeData(); 
   barcode.setValue(value); 
   barcode.setDataCode(0); 
   barcode.setSymbology(BarcodeSymbology.MICRO_PDF417); 
 
   // We will use the alignment to position the barcodes, so use all of the image 
   barcode.setBounds(new LeadRect(0, 0, image.getImageWidth(), image.getImageHeight())); 
 
   // Set the write options 
   MicroPDF417BarcodeWriteOptions options = new MicroPDF417BarcodeWriteOptions(); 
 
   if (topLeft) { 
      options.setHorizontalAlignment(BarcodeAlignment.NEAR); 
      options.setVerticalAlignment(BarcodeAlignment.NEAR); 
   } else { 
      options.setHorizontalAlignment(BarcodeAlignment.FAR); 
      options.setVerticalAlignment(BarcodeAlignment.FAR); 
   } 
 
   options.setUseMode128Emulation(false); 
   options.setLinked(false); 
   options.setEnableGroupMode(false); 
   options.setXModule(30); 
   options.setXModuleAspectRatio(3); 
   options.setLimitByRowsAndColumns(true); 
   options.setSymbolSize(symbolSize); 
 
   // Write it 
   System.out.printf("Writing barcode with symbol size: %1s and Data: %2s%n", symbolSize, value); 
   writer.writeBarcode(image, barcode, options); 
} 
 
// Setup read options 
private void readBarcodes(BarcodeReader reader, RasterImage image) { 
   MicroPDF417BarcodeReadOptions options = new MicroPDF417BarcodeReadOptions(); 
   options.setSearchDirection(BarcodeSearchDirection.HORIZONTAL); 
   options.setEnableDoublePass(false); 
   options.setReadMode(MicroPDF417BarcodeReadMode.MODE0); 
   options.setReadOptionalMacroFileNameField(false); 
   options.setReadOptionalMacroSegmentCountField(false); 
   options.setReadOptionalMacroTimestampField(false); 
   options.setReadOptionalMacroSenderField(false); 
   options.setReadOptionalMacroAddresseeField(false); 
   options.setReadOptionalMacroFileSizeField(false); 
   options.setReadOptionalMacroChecksumField(false); 
   options.setReadOptionalMacro79AndAZField(false); 
   options.setEnableDoublePassIfSuccess(true); 
   options.setEnablePreprocessing(true); 
 
   System.out.println("Reading Barcodes"); 
   BarcodeData[] barcodes = reader.readBarcodes(image, LeadRect.getEmpty(), 0, 
         new BarcodeSymbology[] { BarcodeSymbology.MICRO_PDF417 }, new BarcodeReadOptions[] { options }); 
   System.out.printf("%s barcodes found:%n", barcodes.length); 
 
   for (BarcodeData barcode : barcodes) { 
      System.out.printf(" At %1s data: %2s and symbology: %3s%n", barcode.getBounds(), barcode.getValue(), 
            barcode.getSymbology()); 
   } 
}

Requirements

Target Platforms

Reference

MicroPDF417BarcodeReadOptions Class

MicroPDF417BarcodeReadOptions Members

Leadtools.Barcode Namespace

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Help Version 23.0.2024.2.29

Leadtools.Barcode Assembly

Introduction

Getting Started

Namespaces

Leadtools.Barcode Namespace

Assemblies