Overview
ISO/IEC 15415:2024 - Automatic identification and data capture techniques - Bar code symbol print quality test specification - Two-dimensional symbols - is the third edition of the international standard for assessing the print quality of two-dimensional (2D) bar code symbols. It defines objective measurement and grading methodologies for both multi-row bar code symbologies (stacked/row-based) and two-dimensional matrix symbologies (matrix/module-based). The standard specifies how to obtain and process test images, compute parameter scores, derive an overall symbol grade, and interpret deviations to support corrective action.
Key topics and technical requirements
- Two measurement methodologies: one for multi-row (stacked) symbologies and one for matrix symbologies; methodologies can be applied fully or partially to similar symbologies where a reference decode algorithm exists.
- Image acquisition and optical setup: requirements for obtaining test images, measuring aperture convolution, inspection area and measurement conditions.
- Reference and processed images: guidance on raw, reference grey-scale and binarized images used for grading.
- Grading parameters: includes symbol contrast (Rmin/Rmax), modulation, reflectance margin, fixed pattern damage, axial and grid non-uniformity, unused error correction, print growth, and additional image assessment parameters.
- Grading methods: continuous (decimal) grading introduced in this edition, procedures for per-parameter grading and computation of an overall symbol grade.
- Decode considerations: use of a reference decode algorithm and decode-based grading (e.g., codeword yield, unused error correction).
- Guidance and diagnostics: annexes provide thresholding algorithms, interpretation of scan vs. symbol grades, selection of grading parameters, substrate characteristics, and parameter overlays.
- Applicability to DPM: can be applied to direct part marks, but better correlation with scanning performance is achieved when combined with ISO/IEC 29158.
Practical applications and users
ISO/IEC 15415:2024 is used for:
- Quality control and verification of 2D barcode production (labels, packaging, tickets, documents).
- Verifier manufacturers to implement compliant measurement and grading functionality.
- Equipment integrators and system developers ensuring barcode print/read reliability in supply chains, logistics, retail, healthcare and manufacturing.
- Application specifiers and auditors defining acceptable symbol grades for operational requirements.
- Process improvement: diagnosing printing defects and guiding corrective actions via parameter-level feedback.
Related standards
- ISO/IEC 15416 - Linear barcode print quality (related principles)
- ISO/IEC 15426-1 / 15426-2 - Verifier performance requirements
- ISO/IEC 29158 - Direct Part Mark (DPM) verification guidance (recommended when verifying DPM together with 15415)
Keywords: ISO/IEC 15415:2024, 2D barcode, two-dimensional symbols, barcode print quality, barcode verification, matrix symbols, multi-row symbology, barcode grading, barcode verifier.