Tesseract - OCR recognition, invalid memory access

Question

I am trying to read a license plate of a car/truck using the java Tesseract. However, I am experiencing error. I still can’t understand why.

Follows:

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         

    File imageFile = new File("C:/teste/placa_caminhao.jpg");
    Tesseract tesseract = new Tesseract();
    tesseract.setDatapath("C:/teste/tesseract");
    tesseract.setLanguage("eng");


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

Error:

Exception in thread "AWT-Eventqueue-0" java.lang.Error: Invalid memory access at com.sun.jna.Native.invokePointer(Native Method) at com.sun.jna.Function.invokePointer(Function.java:470) at com.sun.jna.Function.invoke(Function.java:404) at com.sun.jna.Function.invoke(Function.java:315) at com.sun.jna.Library$Handler.invoke(Library.java:212) at com.sun.proxy. $Proxy0.Tessbaseapigetutf8text(Unknown Source) at net.sourceforge.tess4j.Tesseract.getOCRText(Tesseract.java:437) at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:292) at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:213) at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:197) at com.nexello.testesnexello.Main.jButton1ActionPerformed(Main.java:72) at com.nexello.testesnexello.Main.access$000(Main.java:14) at com.nexello.testesnexello.Main$1.actionPerformed(Main.java:39) at javax.swing.Abstractbutton.fireActionPerformed(Abstractbutton.java:2022) at javax.swing.Abstractbutton$Handler.actionPerformed(Abstractbutton.java:2348) at javax.swing.Defaultbuttonmodel.fireActionPerformed(Defaultbuttonmodel.java:402) at javax.swing.Defaultbuttonmodel.setPressed(Defaultbuttonmodel.java:259) at javax.swing.plaf.basic.Basicbuttonlistener.mouseReleased(Basicbuttonlistener.java:252) at java.awt.Component.processMouseEvent(Component.java:6539) at javax.swing.jcomponent.processMouseEvent(Jcomponent.java:3324) at java.awt.Component.processEvent(Component.java:6304) at java.awt.Container.processEvent(Container.java:2239) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2297) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.Lightweightdispatcher.retargetMouseEvent(Container.java:4904) at java.awt.Lightweightdispatcher.processMouseEvent(Container.java:4535) at java.awt.Lightweightdispatcher.dispatchEvent(Container.java:4476) at java.awt.Container.dispatchEventImpl(Container.java:2283) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.Eventqueue.dispatchEventImpl(Eventqueue.java:760) at java.awt.Eventqueue.access$500(Eventqueue.java:97) at java.awt.Eventqueue$3.run(Eventqueue.java:709) at java.awt.Eventqueue$3.run(Eventqueue.java:703) at java.security.Accesscontroller.doPrivileged(Native Method) at java.security.Protectiondomain$Javasecurityaccessimpl.doIntersectionPrivilege(Protectiondomain.java:74) at java.security.Protectiondomain$Javasecurityaccessimpl.doIntersectionPrivilege(Protectiondomain.java:84) at java.awt.Eventqueue$4.run(Eventqueue.java:733) at java.awt.Eventqueue$4.run(Eventqueue.java:731) at java.security.Accesscontroller.doPrivileged(Native Method) at java.security.Protectiondomain$Javasecurityaccessimpl.doIntersectionPrivilege(Protectiondomain.java:74) at java.awt.Eventqueue.dispatchEvent(Eventqueue.java:730) at java.awt.Eventdispatchthread.pumpOneEventForFilters(Eventdispatchthread.java:205) at java.awt.Eventdispatchthread.pumpEventsForFilter(Eventdispatchthread.java:116) at java.awt.Eventdispatchthread.pumpEventsForHierarchy(Eventdispatchthread.java:105) at java.awt.Eventdispatchthread.pumpEvents(Eventdispatchthread.java:101) at java.awt.Eventdispatchthread.pumpEvents(Eventdispatchthread.java:93) at java.awt.Eventdispatchthread.run(Eventdispatchthread.java:82)

Answer 1

The error was due to a missing lib. I just downloaded the file "wget https://github.com/tesseract-ocr/tessdata/raw/master/eng.traineddata", I put it in the right folder and it worked.

I found the solution in the link below: https://stackoverflow.com/questions/14800730/tesseract-running-error