Panasonic IMAGECHECKER PV230 Manual page 25

Segment pre-process filter
It is used when characters cannot be stably cut out in such cases that characters are thin, a character gap is
narrow, or the inspection target is dotted characters. Dilating or eroding the extracted pixels enables 2 separate
characters to be 1 character, or enables 2 characters closely attached to be divided.
The size for dilation or erosion can be specified for X and Y directions respectively.
Filter Description
No Does not execute Filtering process.
(Default)
Dilation Used to cut out thin characters,
broken characters due to uneven
print density or dotted characters.
Erosion Used when characters cannot be cut
out character by character as the
character gap is narrow.
Dotted Used to cut out dotted characters
Char. when they cannot cut out properly
with Dilation filter.
1.
Select "Segment pre-process filter".
Select from No / Dilation / Erosion / Dotted Char.
2.
Set "Filter X" and "Filter Y" values.
In the above example of "Dilation" that "1" is horizontally parted, set "Filter Y" to a value larger than the
parted position to perform Dilation in Y direction. As an optimum value varies according to various
conditions, adjust the value checking the result of "F3: Filtering Process".
3.
Execute Filtering process with the F3 key, and readjust the "Filter X" and "Filter Y" values checking
the displayed results.
Slant Angle
Set when characters are slanted.
Adjust the slant between -45.00 and +45.00 degrees
referring to the image.
When executing Original Image
segmentation
with original
image
When
executing
segmentation
after filtering
process
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