Detect and Extract MRTD - Android Java

This tutorial shows how to create an MRTD extraction and processing application in Android using the LEADTOOLS SDK.

Overview  
Summary This tutorial covers how to use LEADTOOLS MRTD SDK technology in a an Android Java application.
Completion Time 30 minutes
Android Studio Project Download tutorial project (156 KB)
Platform Android (Java)
IDE Android Studio
Runtime License Download LEADTOOLS
Try it in another language

Required Knowledge

Get familiar with the basic steps of creating a project and working with the OcrEngine by reviewing the Add References and Set a License and Recognize-Text-from-Images with OCR tutorials, before working on the Detect and Extract MRTD - Android Java tutorial.

Create the Project and add the Maven artifacts

Start with a copy of the project created in the Display Images in an Image Viewer tutorial. If you do not have that project, follow the steps in that tutorial to create it.

Ensure that you add the needed Artifacts to the project.

For a complete list of which LEADTOOLS libraries are required for your application, refer to Files to be Included With Your Application.

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:

Set the Application Layout

In the Project Explorer window, open the activity_main.xml file found in the app/src/main/res/layout directory. Below the RasterImageViewer XML code add a new RUN OCR button.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:weightSum="1.0" 
    android:background="@android:color/black"> 
 
    <Button 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:text="Select Image From Gallery" 
        android:onClick="onSelectImage"/> 
 
    <leadtools.controls.RasterImageViewer 
        android:id="@+id/rasterimageviewer" 
        android:layout_width="match_parent" 
        android:layout_height="0dp" 
        android:layout_weight=".96" 
        android:background="@android:color/white"/> 
 
    <Button 
        android:id="@+id/button" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:text="Read MRTD" 
        android:onClick="readMRTD"/> 
</LinearLayout> 

Add the MRTD Detection and Extraction Code

In MainActivity.java, add the following import statements before the MainActivity class.

Java
import leadtools.forms.commands.MRTDErrors; 
import leadtools.forms.commands.MRTDReader; 

Add the following member variables to the MainActivity class.

Java
private MRTDReader mrtdReader; 

Update the onCreate() function as shown below.

Java
@Override 
 protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
 
     mrtdReader = new MRTDReader(); 
 } 

Create a readMRTD(View v) function to detect if an MRTD or MRZ is present. If one is present parse the value.

Java
public void readMRTD(View v ) 
{ 
    RasterImage image = mViewer.getImage(); 
 
    if(image != null) 
    { 
        try 
        { 
            mrtdReader.setOcrEngine(ocrEngine); 
            mrtdReader.processImage(image); 
            { 
                //if (!(mrtdReader.getBounds().isEmpty())) 
                if (mrtdReader.getErrors() == MRTDErrors.NO_ERROR.getValue()) 
                    for (var val : mrtdReader.getResults().entrySet()) 
                    { 
                        sb.append(val.getKey().toString()); 
                        sb.append(val.getValue().getReadableValue()); 
                        sb.append(val.getValue().getMrzCharacters()); 
                        sb.append((val.getValue().isValid())); 
                        sb.append("\n\n"); 
                    } 
                if(sb.length() != 0) 
                { 
                    Toast.makeText(this, sb.toString(), Toast.LENGTH_LONG).show(); 
                } 
                else 
                { 
                    Toast.makeText(this, "No detection found: " + mrtdReader.getErrors(), Toast.LENGTH_LONG).show(); 
                } 
            } 
        } 
 
        catch(Exception ex){ 
            Toast.makeText(this, ex.getMessage(), Toast.LENGTH_LONG).show(); 
        } 
    } 
    else 
    { 
        Toast.makeText(this, "No File Is Loaded", Toast.LENGTH_LONG).show(); 
    } 
} 

Run the Project

Press Shift + F10 to run the application. Follow the steps below to test the application.

Wrap-up

This tutorial showed how to use the MRTDReader class to read MRZ and MRTD data.

See Also

Help Version 22.0.2022.9.27
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© 1991-2022 LEAD Technologies, Inc. All Rights Reserved.


Products | Support | Contact Us | Intellectual Property Notices
© 1991-2022 LEAD Technologies, Inc. All Rights Reserved.