Rockwell Automation 5370-OCR2 PAK - Manual (Page 87)

A–B
Glossary
G–1
A
Acquired Image
An image received from the camera. In general, the same as inspected
image.
B
Binary
Refers to an image whose pixels are either black or white.
Button
A button is an on screen interface feature that allows the operator to select or
activate the item specified on the button. The button is activated by placing
the cursor over the button and pressing the left mouse button.
C
Character
In general, a letter, number or symbol. In OCR, either a symbol which
appears in the inspected image (printed character) or a pattern stored in an
OCR font (taught character).
Character Pattern
A 32x32 matrix of pixels which describe the shape of a taught character.
Each pixel may represent black (displayed in green during font teaching),
white (displayed in yellow during font teaching), or don’t–care (displayed as
transparent during font teaching).
Character Recognition
Character recognition, in the image processing context, is the identification
of individual printed characters by a machine vision method.
Confusion Character
A printed character which correlates with more than one taught character.
Correlation
This is the process by which characters are recognized. A printed character
correlates if it is similar to a taught character pattern.
Correlation Box
A box which indicates the region over which a printed character correlates
with a taught character.
Correlation Percentage
This is the percentage of pixels in the printed characters that must match the
taught character in order for the character to be passed. The Correlation
Percentage can be set individually for each character in an OCR font, and the
default is 95%.