Rockwell Automation 5370-OCR2 PAK - Manual (Page 90)

Glossary
G–4
T
Taught Character
One element of an OCR font, consisting of a character pattern, a set of
filtering parameters, and a correlation percentage.
Thin
An operation which erodes and reduces the pixels of the image of a printed
character, for the purpose of teaching a character pattern.
Threshold
The process by which a grayscale image is converted into a binary image.
Also refers to the limit(s) which define the separation between black and
white. In the CVIM2 module, pixels in the grayscale image whose values
are less than the high threhsold and greater than the low threshold will
become white, and the rest will become black.