Detect and Extract Barcodes - Java

This tutorial shows how to create a Java application that detects and extracts barcodes.

Overview
Summary This tutorial covers how to extract barcodes in a Java application.
Completion Time 30 minutes
Visual Studio Project Download tutorial project (2 KB)
Platform Java Application
IDE Visual Studio 2017, 2019
[Runtime License] Download LEADTOOLS

Required Knowledge

Get familiar with the basic steps of creating a project by reviewing the Add References and Set a License and Load and Save an Image tutorials, before working on the Detect and Extract Barcodes - Java tutorial.

Saving images is not necessary to this tutorial, so saving portion can be commented out.

Create the Project and Add LEADTOOLS References

In Eclipse, create a new Java project, and add the necessary LEADTOOLS references.

The references needed depend upon the purpose of the project. The following JAR files are needed for this tutorial:

The JAR files are located at <INSTALL_DIR>\LEADTOOLS21\Bin\Java

Set the License File

The License unlocks the features needed for the project. It must be set before any toolkit function is called. For details, including tutorials for different platforms, refer to Setting a Runtime License.

There are two types of runtime licenses:

Note

Adding LEADTOOLS references and setting a license are covered in more detail in the Add References and Set a License tutorial.

Add the Extract Barcode Information Code

With the project created, the references added, the license set, and the load image code added, coding can begin.

In the Package Explorer, open the _Main.java class. Add the following import statements to the import block at the top.

Java
import java.io.IOException; 
import java.nio.file.Files; 
import java.nio.file.Paths; 
 
import leadtools.*; 
import leadtools.barcode.*; 
import leadtools.codecs.*; 

Add a new method to the _Main class called ReadBarcode(RasterImage _image) and call it inside the main() method after the LoadImage() method call.

Java
public static void main(String[] args) throws IOException 
{ 
	Platform.setLibPath("C:\\LEADTOOLS21\\Bin\\CDLL\\x64"); 
	Platform.loadLibrary(LTLibrary.LEADTOOLS); 
	Platform.loadLibrary(LTLibrary.BARCODE); 
	Platform.loadLibrary(LTLibrary.CODECS); 
		 
	SetLicense(); 
 
	RasterCodecs codecs = new RasterCodecs(); 
	String inputFile = "C:\\LEADTOOLS21\\Resources\\Images\\noisy_barcode.jpg"; 
	//String outputFile = "C:\\Temp\\test.jpg"; 
	RasterImage image = LoadImage(inputFile, codecs); 
	ReadBarcode(image); 
	// SaveImage(image, outputFile, codecs); 
} 

Add the below code to the ReadBarcode method to detect and output barcode information to the console.

Java
static void ReadBarcode(RasterImage _image) 
{ 
	BarcodeEngine bcEngine = new BarcodeEngine(); 
	BarcodeData data = bcEngine.getReader().readBarcode(_image, LeadRect.getEmpty(), BarcodeSymbology.UNKNOWN); 
		 
	if (data != null) 
	{ 
		System.out.println("\nBarcode Found!" +  
                "\nBarcode Symbology: " + data.getSymbology() + 
				"\nBarcode Value: " + data.getValue() +  
				"\nBarcode Bounds: " + data.getBounds()); 
	} 
} 

Note

There are a few other properties inside the BarcodeData class, this tutorial utilizes the most common properties.

Run the Project

Run the project by selecting Run -> Run.

If the steps were followed correctly, the application loads the barcode image, runs barcode recognition, and then outputs the barcode information to the console.

Barcode information displayed to the console.

This tutorial uses this sample image.

Wrap-up

This tutorial showed how to run barcode recognition on an image. Also, it covered how to use the BarcodeEngine, BarcodeReader, and BarcodeData classes.

See Also

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