Vision Sensor SBSI/SBSC-EN, 8062650 - 1607b - 13/09/2016
Page 159
Vision Sensor Manual
Fig. 158: Detector OCR, tab Classification
Parameters Functions
Font
For available fonts s. chap.
0-9 => numbers only
0-9+ => numbers and special characters
A-Z => only capital letters
A-Z+ => capital letters and special characters
No extension => all characters
Ref. String
(Checkbox)
Activates verification of contents of the information read. Verification is done on base of
regular expressions.
Ref. string
This text or regular expression is used for verification. Here can be entered definite
characters, which are compared directly, or with regular expressions to verify the
structure of the result read. Characters which look very similar as number or as letter
like "8" and "B" can be corrected automatically by use of regular expressions.
In the case of the 'Reference string' the detector algorithm purely uses this as a simple
check string, after it has 'segmented' and 'classified' the characters, and its only to
confirm that the decoded string is as the per the 'Reference string'. and it doesn't
influence the classification in any way.
In the case of the 'Reference string' that is made up of a 'regular expression', then the
'expression' will try to use known characters to 'best fit' the expression.ie Day 3 letter
(MON / TUE / WED / etc ) is the segmentation and decode gives M0N rather than MON
then the camera software will automatically 'correct' the (number) 0 to become a
(letter) O .
Add
expression
Opens a list with regular expressions.
Teach ref.
string
Reads the code below the Code Reader and copies the contents into Ref. string. Text
can be edited afterwards.
No. of
alternatives
This command controls how many 'other' near characters are to be considered ie if we
are physically looking at a number '8', the near characters could be 6,9,0,B,R,D,O,S and
only the closest matching 'x' number of near alternatives will be considered.
No. of
corrections
This command controls how many characters with in the string can be changed when
using a regular expression in the reference string ie Day 3 letter (MON / TUE / WED /
etc ) is the segmentation and decode gives the letters W6O rather than WED then with
a setting of '2' in this field the camera software will automatically 'correct' the (number)
6 and (letter) O to become a (letter) E and D - If the setting in the field was 1 then the
detector would fail.
Threshold
Threshold for good-bad decision: if number of corrections is higher than this threshold,
the text will be marked as "not read" (detector result false).
Most important elements of regular expressions
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