How to use my own traineddata language in OCR process?

[Clint William Theron]

Hi. I have a web-app and I'm using the Tesseract CDN like so:

<script src="https://unpkg.com/tesser...@v2.0.0-alpha.13/dist/tesseract.min.js"></script>

I then try to add the path to my own created traineddata language like so:

const worker = new TesseractWorker({
    langPath: 'https://lottoticketscanner.iclips.co.za/assets/tesseract/langs-folder/',
});

and finally I call the recognize method like so:

worker.recognize(canvas.toDataURL('image/png'), 'eng')
                        .progress(progress => console.log('progress', progress))
                        .then(result => console.log('result', result.text))
                        .finally(() => worker.terminate());

This doesn't seem to be using my language (that I created myself). I get the same output as I do when I remove the langPath. I mean I can cleary see my language is not being used in the recognized process. I know it's not because I tested my language (traineddata) in windows desktop and I get the results that I actually want. What needs to change in my code so my (custom) traineddata, and only mine, is being  used?

Thanks.

[Shree Devi Kumar]

You can name your custom traineddata file with a different name eg. mycustom.traineddata, copy the file to your tessdata folder (referred by tessdata_prefix) and then use 'mycustom' instead of 'eng' in your program.

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[Clint William Theron]

Thanks for your answer. I have a different error though. I'm not sure what you mean by tessdata folder. I'm using the tesseract CDN on a http web server in a html web page. The following images illustrates my current problem: 

The first image illustrates the type of server and directory structure I'm using and the second image shows the error. What is the resolution? I know I'm close now though, thanks to you.

My current code looks like so:

html

<script src="https://unpkg.com/tesser...@v2.0.0-alpha.13/dist/tesseract.min.js"></script>

js

const worker = new Tesseract.TesseractWorker({
    langPath: 'https://lottoticketscanner.iclips.co.za/assets/tesseract/tessdata/',
});


worker.recognize(cameraSensor2.toDataURL('image/png'), 'mycustom')

                        .progress(progress => console.log('progress', progress))

                        .then(result => console.log('result', result))
                        .finally(() => worker.terminate());

Thank you.                    

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[Shree Devi Kumar]

Check that mycustom.traineddata is available in https://lottoticketscanner.iclips.co.za/assets/tesseract/tessdata/

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[Clint William Theron]

The traineddata file is available in that location. I took a screenshot of the current error:

I changed the name to custom.traineddata but it's not relevant to the problem. I also changed the location of the file to see if that makes a different but didn't:

const worker = new Tesseract.TesseractWorker({

                  langPath: 'https://iclips.co.za/images/tessdata/',
                });

worker.recognize(cameraSensor2.toDataURL('image/png'), 'custom')...

Do you see what I'm missing here?

Thanks already

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[Shree Devi Kumar]

I have not used tesseract CDN on a http web server in a html web page. 

The error says that the traineddata file cannot be found. You need to check the value of TESSDATA_PREFIX and put your custom traineddata there.

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[Clint William Theron]

I don't know where to find the TESSDATA_PREFIX value since I'm using tesseract CDN on a http web server. What did you do? Did you create a node.js app? I install tesseract in windows 10 and I replaced the traineddata file in the tessdata  directory and it worked. I'm looking to build an online solution though. I got started and found out about the custom traineddata idea from the following link:

https://ourcodeworld.com/articles/read/580/how-to-convert-images-to-text-with-pure-javascript-using-tesseract-js

It's not necessary to use the CDN or even a html web page. The solution should just work online and use my custom traineddata language

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[Clint William Theron]

Where do I find the value of TESSDATA_PREFIX? 

[Clint William Theron]

Check here:

https://lottoticketscanner.iclips.co.za/assets/tesseract/tessdata/

mycustom.traineddata definitely points to the correct location. It must be something else. Would you help me figure it out or at least give me a working solution. Thanks already

[Clint William Theron]

If you recently tested the above link there was a auth require but I have taken that out now. The link should work now. Sorry for any inconvenience. 

[Shree Devi Kumar]

You are using https://github.com/naptha/tesseract.js

Please file your issue in that repo.

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[Clint William Theron]

in which group am I now? I don't understand the groups. I thought  https://groups.google.com/forum/#!forum/tesseract-ocr was the correct group to ask about tesseract.

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