Tesseract reads most numbers correctly but not all. how to improve ?

Asked by MP on 2019-05-03

So I tryed all the PSM setting of Tesseract but with all it still reads the "5" as an S, and the "30" as 3 O (so as letters instead of numbers).

NumberCheck: 5
[error] script [ app_part7 ] stopped with error at line --unknown--
[error] Error caused by: Traceback (most recent call last): File "X:\Sikulix projects\app_part7.sikuli\app_part7.py", line 23, in <module> if int(r.text()) == 0: ValueError: invalid literal for int() with base 10: 'S '

the weird part is , in the numbercheck (which I putted there as a check up) he reads the number correctly, but once I want to do a certain action with the read number, it is like he reads it again but then incorrect...

How can I change the config of Tesseract? I read the doc, but things like tr.setdpi(50) dont work...

so my questions:

1) I dont get the syntax how to change different parts of Tesseract

2) what is the best (read easiest way for a beginner in programming) to read those 2 numbers correctly? The numbers are really small like dpi 50 - 70 something. I read I should scale it to 300? How do I do that?

3) or is there another solution I am not seeing?

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RaiMan (raimund-hocke) said : #1

SikuliX 1.1.4? which?

please paste the relevant code snippet.

MP (jozzzzzz) said : #2


 r = Region(1059,318,18,17)
 regiononchangecheck = Region(1056,316,342,23)

    tr = TextOCR.start()

    def eventstop(event):


    print ("NumberCheck: ") + r.text()

    if int(r.text()) == 5:
         print ("0")
         action1 (click, etc)

MP (jozzzzzz) said : #3


1) So I found the settings I need that will solve my problem (i think).

I want that tesseract only uses numbers:

But again I have trouble using the right syntax in sikulix.

tr.setoutputbase digits (not working)

2) Another solution is:

 made it a bit different (with tess-two). Maybe it will be useful for somebody.

So you need to initialize first the API.

TessBaseAPI baseApi = new TessBaseAPI();
baseApi.init(datapath, language, ocrEngineMode);

Then set the following variables

baseApi.setVariable(TessBaseAPI.VAR_CHAR_BLACKLIST, "!?@#$%&*()<>_-+=/:;'\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
baseApi.setVariable(TessBaseAPI.VAR_CHAR_WHITELIST, ".,0123456789");
baseApi.setVariable("classify_bln_numeric_mode", "1");

Yet again I cant seem to get the syntax right. How do I let tesseract know in sikulix the baseApi commands?

MP (jozzzzzz) said : #5

Hey raiman,, As mentioned in the first post, I read the doc first.
Tr.setDPI(50) for example doesnt work. In the doc there is no answer how the syntax then must be.

MP (jozzzzzz) said : #6

Maybe I should mention:

I tryed ofc the command
tr.setVariable(variableKey, variableValue) from your doc before making this topic.

Can you show me how you do this for example with saying tessact only to read numbers ?

Cause the only one I get to work is tr.setPSM(number)

RaiMan (raimund-hocke) said : #7

I have no experience.

it is either
... which sets a single option

... which IMHO accepts a list of confi file names

about both you have to consult the Tesseract docs (with 1.1.4 it is Tesseract 3)

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