Actually, it doesn't serve regexp - the while list as an enumeration is
supported only.
On Friday, July 1, 2011 at 9:59:26 PM UTC+2, 8flm6 wrote:
>
> Yes a filtering by regular expressions sounds good, though I had
> hoped tesseract could do this on its own. I might try a set of
> trainedata
> limited to numbers as well, in addition to white and black lists.
> Maybe that works, I will post my results when finished.
>
> thanks for your reply!
>
> 8flm6
>
> On 1 Jul., 15:15, patrickq <patrick.questemb...@gmail.com> wrote:
> > Yes, Tesseract black lists and whitelists are useful almost
> > exclusively in situations where you really don't have the blacklisted
> > characters anywhere in the image (otherwise Tesseract will return the
> > next best guess, no matter how poor) or vice-versa where you have only
> > the whitelisted characters in image.
> >
> > The solution for achieving what you want is to set a variable telling
> > Tesseract to ignore any match it finds below a specified confidence
> > level. I wouldn't be surprised if there is such a variable but I have
> > no idea what it is.
> >
> > We take a different approach to detecting numbers with tolerance for
> > errors: we define in our regular expressions a long list of letters we
> > accept as digits them convert - but we do that only when it helps us
> > complete a pattern. For example:
> > - in (88B)1G2-2345 we accept and map to (888)162-2345
> > - but in "BB (123)456-7861" we leave the B's alone
> >
> > Patrick
> >
> > On Jul 1, 8:35 am, 8flm6 <8f...@gmx.de> wrote:
> >
> >
> >
> >
> >
> >
> >
> > > Hello,
> > > I'm trying to apply White- and Blacklists to my OCR-result. If I call:
> > > SetVariable("tessedit_char_whitelist", "0123456789")
> >
> > > Then all characters in the result are converted to numbers between 0
> > > and 9. Is that the correct behaviour
> > > of this option? After my understanding of a whitelist, only those
> > > characters should returned which are
> > > defined in the list, all others should be blocked.
> > > The same with the blacklist. I call:
> > > SetVariable("tessedit_char_blacklist", "0123456789")
> >
> > > This option converts all occurences of numbers to random characters.
> >
> > > This is the image I used:
> https://docs.google.com/leaf?id=0B2ifXewLRYsdMzY3MzIwMTUtZTkxNS00ZDM1...
> >
> > > Example results:
> > > normal output:
> > > Tesseract 3.00
> > > 123456789
> >
> > > whitelist output:
> > > 1185587301 3100
> > > 123456789
> >
> > > blacklist output:
> > > Tesseract B.OO
> > > QBASGYSQ
> >
> > > Any help would be appreciated!
> >
> > > thanks
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