Hi Ketut,

On Tue, Jun 10, 2014 at 11:30:39PM -0700, ketut ariasa wrote: 
> I have a very limited OCR application using tesseract, where I want to
> recognize only 8 letters and numbers begin with the letter 'D'.
> Is there a way to restrict tesseract to attempt to 
> recognize only 8 digits letters and number (with the implicit hope that this
> improves accuracy)?

You should try playing with user-patterns. Read the tesseract 
manpage, and the section of code it references (yes, it probably 
should be better documented!)

Nick

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