Hardware manual

Impact Reference Guide Code Reader
3-175 Datalogic Automation Inc.
ISO/IEC 15416
Defects Grade
Defects are irregularities found within elements and quiet zones, and are
measured in terms of element reflectance non-uniformity. Element
reflectance non-uniformity within an individual element or quiet zone is
the difference between the reflectance of the highest peak and the
reflectance of the lowest valley. Defect measurement is expressed as
the ratio of the maximum element Reflectance Non-Uniformity (ERN-
max) to Symbol Contrast. See “Code Quality Grades” on page 6-39.
ISO/IEC 15416
Decodability Grade
The decodability of a barcode symbol is a measure of the accuracy of its
production in relation to the appropriate reference decode algorithm. See
“Code Quality Grades” on page 6-39.
AIM DPM Decode
Grade
On a Pass/Fail basis, whether the symbol has all its features sufficiently
correct to be readable. If the image cannot be decoded using the code
type reference decode algorithm, then it receives the failing grade zero.
Otherwise, it receives the grade four. See “Code Quality Grades” on
page 6-39.
AIM DPM Cell Con-
trast Grade
Grades the difference between the means of brightest and darkest val-
ues of the symbol (instead of determining differences between the
brightest and darkest values). See “Code Quality Grades” on page 6-39.
AIM DPM Unused
Error Correction
Grade
The extent to which regional or spot damage in the symbol has eroded
the information redundancy margin that error correction provides. 100%
Unused Error Correction Capacity is the ideal condition. See “Code
Quality Grades” on page 6-39.
AIM DPM Axial Non
Uniformity Grade
Grades the squareness of all modules in the direction of each of the
symbol's major axes (X-axis and Y-axis) by applying the decode algo-
rithm to the binarized image. See “Code Quality Grades” on page 6-39.
AIM DPM Fixed
Pattern Damage
Grade
Similar to Cell Modulation, but it grades the finder pattern and clock pat-
tern, as well as the quiet zone around the code, instead of the data
region. See “Code Quality Grades” on page 6-39.
AIM DPM GRID
Non Uniformity
Grade
Grades the largest vector deviation of the grid intersections, determined
by the reference decode algorithm from the binarized image of a given
symbol, from their "ideal" theoretical position. Assuming a grid on which
the ideal angle of intersection is 90°, any angle deviation from 90° consti-
tutes Grid Non-Uniformity. See “Code Quality Grades” on page 6-39.
AIM DPM Cell Mod-
ulation Grade
Analyzes the grid center points within the data region to determine the
reflectance uniformity of light and dark elements after considering the
amount of error correction available in the code. See “Code Quality
Grades” on page 6-39.
AIM DPM Min
Reflectance Grade
The image brightness is adjusted on a reference part, after which this
calibrated value is compared with the reflectance of that part. Minimum
Reflectance is the ratio of the parts reflectance to the calibrated reflec-
tance. See “Code Quality Grades” on page 6-39.
VL VERSION The VL Decoding library version for product support use.
Output Name What it is