Mute "Empty page!!" print when using libtesseract?

[MPursche]

Hello!

I have a use-case for Tesseract where I'm not always 100% sure that there is text in the image I try to do OCR on. When it runs and gets to one of these images it prints "Empty page!!" to the console which interferes with the user experience a lot.

I did some searching and I found this: https://github.com/tesseract-ocr/tesseract/wiki/FAQ#how-can-i-make-the-error-messages-go-to-tesseractlog-instead-of-stderr

However, I am using Tesseract as a library, not as a command line tool. Can I mute this behaviour from code?

I would prefer to modify my usage of libtesseract rather than make changes of libtesseract directly if possible since I am using a wrapper for C#, but if I have to I will compile my own libtesseract.dll.

I already tried redirecting Console.Out and Console.Error before making my calls to libtesseract but it didn't help.

[Zdenko Podobny]

Set parameter debug_file to /dev/null (or some filename, where you can check warning from tesseract)

Zdenko

ut 8. 10. 2019 o 12:57 MPursche <purs...@gmail.com> napísal(a):

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[MPursche]

Thanks that worked. :)

On Tuesday, October 8, 2019 at 2:23:26 PM UTC+2, zdenop wrote:

Set parameter debug_file to /dev/null (or some filename, where you can check warning from tesseract)

Zdenko

ut 8. 10. 2019 o 12:57 MPursche <purs...@gmail.com> napísal(a):

Hello!

I have a use-case for Tesseract where I'm not always 100% sure that there is text in the image I try to do OCR on. When it runs and gets to one of these images it prints "Empty page!!" to the console which interferes with the user experience a lot.

I did some searching and I found this: https://github.com/tesseract-ocr/tesseract/wiki/FAQ#how-can-i-make-the-error-messages-go-to-tesseractlog-instead-of-stderr

However, I am using Tesseract as a library, not as a command line tool. Can I mute this behaviour from code?

I would prefer to modify my usage of libtesseract rather than make changes of libtesseract directly if possible since I am using a wrapper for C#, but if I have to I will compile my own libtesseract.dll.

I already tried redirecting Console.Out and Console.Error before making my calls to libtesseract but it didn't help.

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[Lorenzo Bolzani]

Hi,

I suspect what you are using is not a real api bindings but more of a command line wrapper. This is very slow and inconvenient to use.

I would simply use the API, probably even the plain tesseract libs as you are using C#. The API does not write anything to the console.

Lorenzo

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[MPursche]

I think you might be right, I just installed this one from NuGet: https://github.com/charlesw/tesseract/

Do you know of a C# binding you would recommend?

On Tuesday, October 8, 2019 at 2:52:42 PM UTC+2, Lorenzo Blz wrote:

Hi,

I suspect what you are using is not a real api bindings but more of a command line wrapper. This is very slow and inconvenient to use.

I would simply use the API, probably even the plain tesseract libs as you are using C#. The API does not write anything to the console.

Lorenzo

Il giorno mar 8 ott 2019 alle ore 12:57 MPursche <purs...@gmail.com> ha scritto:

Hello!

I have a use-case for Tesseract where I'm not always 100% sure that there is text in the image I try to do OCR on. When it runs and gets to one of these images it prints "Empty page!!" to the console which interferes with the user experience a lot.

I did some searching and I found this: https://github.com/tesseract-ocr/tesseract/wiki/FAQ#how-can-i-make-the-error-messages-go-to-tesseractlog-instead-of-stderr

However, I am using Tesseract as a library, not as a command line tool. Can I mute this behaviour from code?

I would prefer to modify my usage of libtesseract rather than make changes of libtesseract directly if possible since I am using a wrapper for C#, but if I have to I will compile my own libtesseract.dll.

I already tried redirecting Console.Out and Console.Error before making my calls to libtesseract but it didn't help.

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[Lorenzo Bolzani]

I'm not a C# developer but I suppose you can just use the c++ library as is.

Lorenzo

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[Zdenko Podobny]

Unfortunately you are wrong on this:

1. He is using the real api binding (if not the best, at least most active C# tesseract solution)
2. Tesseract library prints output to stderr and stdout. Check the source.

Zdenko

Dňa ut 8. 10. 2019, 14:52 Lorenzo Bolzani <l.bo...@gmail.com> napísal(a):

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[Lorenzo Bolzani]

Ok, I trust you, strange I never noticed it. Maybe it does this only for some PSM modes that I do not use.

Thanks for clarifying.

Lorenzo

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