How to recognize single hyphen in psm=6

[Ankhbayar Gansukh]

Hello,

I am new to tesseract and would be very appreciate if someone help me.

Tesseract5 recognizes succesfully single hyphen in psm=7.

Example: tesseract --psm 7  single_hyphen_char.jpg stdout

When use psm=6 it does not recognize single hyphen.

Example: tesseract --psm 6  single_hyphen_char.jpg stdout

I cannot use psm 7 because image can be multiline.

Any advice would be greatly appreciated!

Ankhbayar

[Zdenko Podobny]

 I’m having trouble understanding the issue you're encountering—you mentioned that your input could be multiline, but the example you provided only contains a single character. I’m also surprised that even psm 7 works in this case.  

 The problem is that a hyphen, when presented as a single character, can sometimes be interpreted as a vertical line or graphical element and may be ignored. Typically, in a multiline context, it's recognized correctly.  

Zdenko

pi 4. 10. 2024 o 19:16 'Ankhbayar Gansukh' via tesseract-ocr <tesser...@googlegroups.com> napísal(a):

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[Ankhbayar Gansukh]

Hi Zdenop, thank you for your reply.

The input images are dynamic, can be multiline or singleline. I attached only image which i have problem. 

Yes psm 7 the example image works fine somehow. 

In multiline context (psm 6) it recognizes hyphens fine when it together with other characters, but does not recognize single hyphen when alone.

I wonder is there any way to train to recognize correctly single hyphen. Or any tesseract option.

Thanks,

Ankhbayar