C001537_04_CR2 User Manual - 49
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7.5 - Code Readability Index
The Readability Index provides a measurement of a specific symbol’s ease or difficulty to be decoded
by the CR2. The Readability Index is specific to the CR2, and should not be confused with a
verification quality measurement.
The Readability Index is a blend of information obtained from the internal operations of the decoding
algorithm pertaining to contrast, symbology construct, error detection, forward error correction (if
applicable), and other symbology-specific characteristics.
The Readability Index is a score on a scale of 01 (very poor) to 100 (very readable). Due to differences
based on motion, skew, reflection, focus, and ambient lighting, the Readability Index on the same
symbol may vary somewhat from read to read. However, a poor contrast or damaged symbol will score
lower than a high contrast undamaged symbol. The Readability Index can be used as a quick check on
the reliability of label generation or marking systems. When used in conjunction with the CR2 stand (or
fixed mount positioning) which fixes the distance from the reader to the symbol, and constant ambient
light, the Readability Index provides a symbol quality assurance tool and check point for feedback to an
overall label or marking quality control system.
The Readability Index is enabled by first reading a CodeXML rule into the permanent CR2 Memory:
Code Readability Index Rule:
Readability Index Output Enable:
Scan the following codes to set the delay time for reading duplicate codes:
0 Seconds (Default) 1 Second 3 Seconds
7.4.3 - Continous Scan - Duplicate Scan Delay
The reader will store the rule and reset, but
will not output the Readability Index until
the Readability Index Output Enable code is
read. To remove this rule, scan the Clear All
CodeXML Rules code in section 11.1.
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