Panasonic IMAGECHECKER PV230 Manual page 20

Point to be checked for character segmentation before
registration in dictionary
Confirm if the character is surrounded with a square. At this time, the square should be placed as close to
the character as possible. The common cases of character segmentation are as follows.
- Characters are not segmented.
Adjust the settings of binarization and segment pre-process filter in the
"Image Filter" menu.
- A stain or a burr is also in the box.
Adjust the setting of binarization to prevent stains or burrs from being in
boxes. If a character with an unnecessary object is registered in the
dictionary, it is recognized as the correct sample. So, capture a clean object
as much as possible for the registration in the dictionary.
- "i" or "j" is divided into multiple boxes.
Adjust using "Segment pre-process filter". Make multiple boxes into a single
box by increasing filter Y with "Dilation".
- Although characters are surrounded with boxes, there are some
holes.
When characters are completely surrounded, it does not matter if there are
spotty parts in red areas. The red areas are for identifying the sizes of
characters. Those grayscale images surrounded with boxes are used for the
dictionary and used as objects for inspections.
- Adjacent characters are in the same box.
This case is no problem. Select "Yes" for "Partition" under "Segment
Condition", and set a size approx. 1.5 times larger than the character width
in "Character Width". Refer to page 25 for details
-
If a character joins another character or an object by "Segmentation",
those characters cannot be segmented.
Change the printed position of the characters. In the left-hand figure, "j" and
"t" cannot be segmented as they are too close.
Confirming Segmented Characters
About <F2> and <F3> Keys
Pressing the F3 key while various items for Segmentation condition are set displays the result of "Segment
pre-process filter", and pressing the F2 key displays the final result of segmentation.Use the F2 or F3 key for
checking the segmentation results and for adjusting each segmentation condition.
• The filter process and segmentation is performed on the last captured image (memory image).
• If an unexpected result is displayed when confirming the segmentation result with the F2 or F3 key, the
image may not have been captured. In such case, run the test (press the TRIG button) to capture the
image, and press the F2 key or F3 key again.
F3: Filter process
Use it to check the dilated or eroded states after the segment filter
process.
As a result of the segment filter process, the extract pixels are
displayed in green.
F2: Segment
The final result of segmentation (the result of all the processes set in
"Segmentation Condition") is displayed. The pixels which make up
characters are displayed in green, and the circumscribing rectangle
for each character is displayed in red.
The area of each character in green, and the widths and sizes of the
red borders are displayed in the list of segmentation results.
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