Tess4J: Invalid memory access

[Subramaniyan Suresh]

I am using Tess4J in my project to extract text from an image (Using Eclipse IDE). I am getting the following error when I try run the OCR. Any suggestion?  

Error: Exception in thread "main" java.lang.Error: Invalid memory access

Note: I have attached the image file which I've used 

My Code:

package tesseractTraining;

import java.io.File;

import net.sourceforge.tess4j.*;

public class TesseractMainRunner {

public static void main(String[] args) {

File imageFile = new File("E:\\Tesseract\\Test Images\\sample.png");

Tesseract instance = new Tesseract();

try {

instance.setDatapath("C:\\Program Files (x86)\\Tesseract-OCR\\tessdata");

instance.setLanguage("eng");

String result = instance.doOCR(imageFile);

System.out.println(result);

} catch (TesseractException e) {

System.err.println(e.getMessage());

}

imageFile.exists();

}

}

[Quan Nguyen]

I tested your sample image and confirmed the error. It looks like a bug in the routine that determines the image's bit depth. A new version will be released once a fix is worked out and committed.

Thank you for reporting.

[Quan Nguyen]

The issue has been fixed in the latest releases published today.

Thanks.

On Sunday, September 2, 2018 at 11:50:53 AM UTC-5, Subramaniyan Suresh wrote:

[Subramaniyan Suresh]

Thanks for your quick turnaround.

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[Rajith Kariyawsam]

Still, the same error occurred for me.

code: 

<dependency>
    <groupId>net.sourceforge.tess4j</groupId>
    <artifactId>tess4j</artifactId>
    <version>4.3.1</version>
</dependency>

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
    <version>3.141.59</version>
</dependency>

File imgFile = findElement(captchaimgIdPath).getScreenshotAs(OutputType.FILE);
String pth = "C:\\Users\\username\\Downloads\\capthca1\\testcap.png"; //src/main/resources
Thread.sleep(2000);
FileHandler.copy(imgFile, new File(pth));
Thread.sleep(2000);
Tesseract cptcha = new Tesseract();
cptcha.setDatapath(pth);
cptcha.setLanguage("eng");
String text = cptcha.doOCR(new File(pth));

System.out.println(text);

[Quan Nguyen]

It looks like the datapath is set incorrectly. It should be set to tessdata folder.

[Rajith Kariyawsam]

Hi Quan,
I didn't got wht do you mean by 'tessdata ' folder.
given pth is the copied image(png) location.  my image name is 'testcap.png'

as per the below line 

String pth = "C:\\Users\\username\\Downloads\\capthca1\\testcap.png";

FileHandler.copy(imgFile, new File(pth));

Appreciate it if you can further describe it, please.

[Quan Nguyen]

cptcha.setDatapath(pth); <---- incorrect pth value

[Rajith Kariyawsam]

Hi Quan,

'pth' is the image location in my PC. 
I verified it with debug mood too.
As I know image location should set to the 'Datapath.'

If the 'pth' is incorrect what should pass for that parameter. 

Realy helpful if you can further explain it to me, please ?

[Rajith Kariyawsam]

Hi Quan,

I got the point. By the below video.
I miss download dependency.

https://www.youtube.com/watch?v=5DqW9KP-aQo&t=425s

And I will try that.
Thank you very much.

[Quan Nguyen]

setDatapath should be set to the path to tessdata folder, which contains *.traineddata files. It's not the path to your image files.