ocr on real (dirty) printing

[Peter Joh. Brunner]

I have a problem using tesseract with german fraktur.

firstly the text to be ocr'd is real printed text of about 1930.
the printing is a little dirty i.e. there are little points and strokes between
the letters.
though these are far smaller than the other letters, they are interpreted as
normal letters.

Is there a possibility to give parameters to tesseract that it
. either should neglect letters which do not fit the majority of the other
  letters,
. or it should only use letters in a given range of size
. or to firstly make the boxes,
  then correct the boxes, by hand or program,
  finally translate using the corrected boxes

a solution with a dictionary is not possible, because the text consists of only
names of persons and locations.

Another thing i wonder is:
when i ocr an image from .tiff to .txt
and makebox of the same image
some (few) letters are different recognized!

thanks for help in advance

[Peter Joh. Brunner]

once again, with more information:

I have a problem using tesseract with german fraktur.

I work with tesseract 3.02.02 on SUSE Linux 13.2

firstly the text to be ocr'd is real printed text of about 1930.
the printing is a little dirty i.e. there are little points and strokes between
the letters.
though these are far smaller than the other letters, they are interpreted as

normal letters.oes-frak.frak.exp017

Is there a possibility to give parameters to tesseract that it
. either should neglect letters which do not fit the majority of the other
  letters,
. or it should only use letters in a given range of size
. or to firstly make the boxes,
  then correct the boxes, by hand or program,
  finally translate using the corrected boxes

I have already tried with a config-file to modify
  textord_min_xheight 24
  textord_xheight_mode_fraction 0.9
  textord_xheight_error_margin 0.1
  textord_descx_ratio_min 0.3
  tessedit_redo_xheight FALSE
it changes some things but nothing to neglect the points and strokes

following an example:
the appended picture is translated to the text
  15 Ellser Exdmsund Mögsgzerg