Rockwell Automation 5370-OCR2 PAK - Manual (Page 33)

Chapter 4
OCR Tool Configuration
4–14
To set the character size:
1. Make sure that the largest character in the font is displayed within the
pick and place window.
2. Choose either Rescale or Define XY (see previous page)
3. Click the Auto button.
Note: Auto Character Size works with character sizes in the range of
11 to 127 pixels. If the message “No Suitable Characters Found For Auto
Char Size” is displayed, make sure that the characters in the source image
are within the height range of 11 to 127 pixels.
If the Character Size box is placed around the widest character, select
Done.
If the Character Size box is not satisfactory (it could happen when
characters are touching each other or too many characters are inside the
OCR window), you can manually adjust the Character Size box around
the widest character in the font. Drag the character size box or use the
arrow keys on the Character Size panel to move the box manually.
Important: Manually adjusting the Character Size box is not
recommended. If possible, always use the Auto button.
In some cases, it may be necessary to adjust the character size manually.
One example is when using dot-matrix characters, where the characters are
composed of many separate dots which do not touch. In this case, you must
manually place the character size box around the largest character.
Auto Character Size will not
work on this character.
HINTS:
•
You should note that in some fonts there are differences in the heights of
letters and numbers. In addition, some lowercase letters may be taller
than some uppercase letters. Use the largest character from the tallest
class of characters to set the character height. Set the width using the
widest character (usually M or W).
•
Let the system select the Character Size automatically when first
teaching the font for optimum results.
•
The Character Size box should be tightly bound around the character
that has the largest width of the characters in a font for optimum results.
•
The Threshold must be properly adjusted before using Character Size.