Tess4J and Maven

[Thomas Denson]

Hi Team,

I'm having some issues using the maven version of Tess4J.
I've created a new project, added the tess4j maven dependency. 3.2.1
And tried to run the example code from the website and I get the following error:

21:58:11.838 [main] ERROR net.sourceforge.tess4j.Tesseract - Input not set!
java.lang.IllegalStateException: Input not set!
    at com.github.jaiimageio.impl.plugins.tiff.TIFFImageReader.getNumImages(TIFFImageReader.java:259)
    at net.sourceforge.tess4j.util.ImageIOHelper.getIIOImageList(ImageIOHelper.java:366)
    at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:213)
    at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:197)
    at Main.main(Main.java:18)
java.lang.IllegalStateException: Input not set!

Sample code:

import java.io.File;

import net.sourceforge.tess4j.ITesseract;
import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;

public class Main {

    public static void main(String[] args) {
        File imageFile = new File("test.tif");
        ITesseract instance = new Tesseract();  // JNA Interface Mapping
        // ITesseract instance = new Tesseract1(); // JNA Direct Mapping

        try {
            String result = instance.doOCR(imageFile);
            System.out.println(result);
        } catch (TesseractException e) {
            System.err.println(e.getMessage());
        }
    }
}

Pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>test</groupId>
  <artifactId>test</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>pkgo ocr app</name>
  <description>A ocr app to read pkgo images and calculate stats</description>
  <dependencies>
    <dependency>
        <groupId>net.sourceforge.tess4j</groupId>
        <artifactId>tess4j</artifactId>
        <version>3.2.1</version>
    </dependency>
  </dependencies>
</project>

Any help would be greatly appreciated

[Quan Nguyen]

"Input not set!" means you have not set the input image file. It's most likely that the file does not exist at the specified location. Substituting with a full path will help you debug the issue better.

[Balaji Devadoss]

Hi I am able to run the java code with tesseract with below code in eclipse.

        Tesseract tesseract = new Tesseract(); 
        try { 
            String text1 = tesseract.doOCR(new File("C:\\Program Files (x86)\\Java\\jre1.8.0_231\\bin\\sample.png")); 
            System.out.print(text1);                    
        } 
        catch (TesseractException e) { 
            e.printStackTrace(); 
        }

But when i make a jar file out of this and run it in Oracle forms it gives below error. kindly advice.

16:09:10.149 [thread applet-oracle.forms.engine.Main-1] ERROR net.sourceforge.tess4j.Tesseract - No input source set!
java.lang.IllegalStateException: No input source set!
    at com.sun.imageio.plugins.png.PNGImageReader.getNumImages(Unknown Source)
    at net.sourceforge.tess4j.util.ImageIOHelper.getIIOImageList(Unknown Source)
    at net.sourceforge.tess4j.Tesseract.doOCR(Unknown Source)
    at net.sourceforge.tess4j.Tesseract.doOCR(Unknown Source)
    at Today2class.init(Today2class.java:34)
    at oracle.forms.handler.UICommon.instantiate(Unknown Source)
    at oracle.forms.handler.UICommon.onCreate(Unknown Source)
    at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
    at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
    at oracle.forms.engine.Runform.processMessage(Unknown Source)
    at oracle.forms.engine.Runform.processSet(Unknown Source)
    at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
    at oracle.forms.engine.Runform.onMessage(Unknown Source)
    at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
    at oracle.forms.engine.Runform.startRunform(Unknown Source)
    at oracle.forms.engine.Main.createRunform(Unknown Source)
    at oracle.forms.engine.Main.start(Unknown Source)
    at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter.start(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)

[Quan Nguyen]

You should not put your sample image in Java installation folder. Anyway, you need to verify the input file exist at the specified location.

File file = new File(<path to your input image>)
if (file.exists()) {
...
}

[Seth Whittaker]

Hi Team,

I have the following scenario:
Springboot application embeding Tess4J to run Tesseract OCR engine.
Environment: VM in GCP running Linux (pending choosing the best distribution).
* 2 GPU's available.

I'd like to know if there is already a version of Tess4J compiled with OpenCL to make use of available GPU's or
... How can I build Tesseract OCR engine with OpenCL to use GPU's or
... Do I have any other options to use GPU's

GPU = NVIDIA GPGPU

... please?