8 Advanced Settings
8-10
MicroHAWK V320-F / V330-F / V420-F / V430-F Barcode Reader User Manual
Process Overview
The three specification grading functions described in this document are independent of each other as
an inspection process but are dependent on the X Mode decoder being properly setup to read the
symbol type provided. The grading evaluation process does not take place until a symbol has first been
identified by the X Mode decoder. Once a symbol supported by an enabled grading specification has
been identified by the decoder a separate grading inspection will commence. Note this inspection
process can add significant processing time to the overall process and each specification requires
independent processing. Furthermore, enabling any single parameter within a given specification
requires the complete grading process for that specification.
Overview
This section outlines the grading implementation for ISO 15416 available in the MicroHAWK firmware.
Please refer to the free AIM guide “The Layman's Guide to ANSI, CEN and ISO/IEC Linear Bar Code
Print Quality Documents” or the ISO specification documents for additional detail related print quality
subject matter.
Supported Symbologies
• Code 128 / GS1-128
• UPC-A / UPC-E / EAN-13 / EAN-8
• Interleaved 2 of 5 / ITF-14
• Code 39
• Code 93
• Codabar
Minimum Resolution
• 4.0 Pixels Per Element (Element = Nominal X Dimension)
Illumination and the Scan Reflectance Profile
The accuracy and consistency of ISO 15416 grading depends greatly upon the illumination in the field
of view. The ISO 15416 specification is evaluated by analyzing individual scan lines applied across the
imaged symbol. These scan lines generate a signal called the scan reflectance profile which is the
basis of the scan line grading methodology. This scan line grading methodology uses a fixed threshold
to determine whether the signal state represents a bar or a space. Verification systems are designed to
create a very flat relative signal response across the field of view. For reading a symbol there is a high
tolerance to variability in the response. When grading or verifying a symbol a flat relative response is
what allows the symbol to be precisely measured. Different optical configurations and illumination
sources can create a wide range of responses that can impact measurements in a variety of ways.
General Grading Functionality
Grading - ISO 15416
Usage / Notes
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