Modulation and Decodability

Modulation and decodability are easy to understand if you are familiar with the Scan Reflectance Profile or SRP. This is discussed in previous articles in this blog. The Scan Reflectance Profile is a powerful diagnostic tool for gauging what is going on with a barcode symbol. The SRP makes it easier to talk about reflectivity attributes…

Edges: Bar and Space Transitions

As we’ve said before, barcode scanners work based on reflectivity and contrast. The messages encoded in linear barcodes are decoded on the basis of the scanner’s ability to detect reflective and contrast differences. In a pattern of lines and spaces, these critical differences are demarked by the edges—the places where the bar ends and the…

Minimum Reflectance and Symbol Contrast

Minimum Reflectance and Symbol Contrast are tested by taking reflectance readings from the symbol—specifically the maximum reflectance value and the minimum reflectance value, and applying a calculation to those values. Minimum Reflectance is a Pass/Fail parameter A barcode image must have a minimum amount of reflective difference between the barcode and the background for the…

ANSI Specification for Linear Barcode Quality

The ANSI specification for the quality—and therefore the performance—of linear barcodes tests and grades 9 parameters. Whether or not you believe that ISO or ANSI are legitimate and meaningful as a quality benchmark, the ANSI specification is the basis for defining barcode acceptability. The ANSI specification for the quality of linear barcodes tests and grades…

Honeywell Verifier Retirement: What Does It Mean?

On June 9, 2011 Honeywell Scanning and Mobility released PRN #11-06, announcing the retirement of their entire line of barcode verifiers. Previously they had retired a substantial portion of their verifier line—in particular most of the wand-based devices. Honeywell verifier retirement comes as no surprize after several years of non-commitment to this industry Several years earlier,…

PV-1070 Portable Barcode Verifier

The PV-1070 is a bundled package including a V7015 verifier and a PV-1000 Portable Display Unit (PDU). On its own the V7015 is a pc-tethered verifier (USB) for larger barcodes such as ITF-14, up to 195mm (7.7”) wide. Along with the PV-1000 it acquires all the features, functionality and freedom of portability—but with none of…