Improving accuracy on recognition Tesseract 4.3.1

[Nenad Kocev]

Hello, I recently discovered Tesseract and I've been using it to extract digits from images using tess4j library. With the settings posted bellow I get around 85% accuracy of recognition.

Is there a way to get 100% accuracy. I have example of an image in the attachments. Other images may differ only in number of digits they have and may also contain special characters like ",+-". Thanks for your help. 

Settings:

tesseract.setPageSegMode(7); // text is in single line

tesseract.setTessVariable("tessedit_char_whitelist", ",+-0123456789");
tesseract.setTessVariable("load_system_dawg ", "false");
tesseract.setTessVariable("load_freq_dawg ", "false");

[Quan Nguyen]

The whitelist feature is currently not working in Tesseract 4.0.0.

https://github.com/tesseract-ocr/tesseract/issues/751 

[Alberto Andreotti]

Hello,

You can try the OCR preprocessing  in spark NLP, if you are on Python or Scala.

Try to use the scaling option.

Alberto.

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[易鑫]

The latest Tesseract version is 4.0.0,how do you get the 4.3.1 version?

Alberto Andreotti <albertoa...@gmail.com> 于2019年2月25日周一 上午8:38写道：

Hello,

You can try the OCR preprocessing  in spark NLP, if you are on Python or Scala.

Try to use the scaling option.

Alberto.

On Feb 24, 2019 2:21 PM, "'Nenad Kocev' via tesseract-ocr" <tesser...@googlegroups.com> wrote:

Hello, I recently discovered Tesseract and I've been using it to extract digits from images using tess4j library. With the settings posted bellow I get around 85% accuracy of recognition.

Is there a way to get 100% accuracy. I have example of an image in the attachments. Other images may differ only in number of digits they have and may also contain special characters like ",+-". Thanks for your help. 

Settings:

tesseract.setPageSegMode(7); // text is in single line

tesseract.setTessVariable("tessedit_char_whitelist", ",+-0123456789");
tesseract.setTessVariable("load_system_dawg ", "false");
tesseract.setTessVariable("load_freq_dawg ", "false");

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[Quan Nguyen]

He was referring to the tess4j version.