Overview
ISO/IEC 23941:2022 specifies the Rectangular Micro QR Code (rMQR) bar code symbology for automatic identification and data capture (AIDC). The standard defines how rMQR symbols are built, encoded, printed, and decoded - including symbology characteristics, data encoding methods, symbol formats, dimensional characteristics, error correction rules, reference decoding algorithms, printing quality requirements, and user-selectable application parameters. It targets compact, rectangular QR-style barcodes optimized for small-mark areas.
Key Topics
- Symbology definition and structure: Detailed specification of symbol components such as finder patterns, timing patterns, alignment patterns, separators, encoding region and quiet zone.
- Symbol versions and formats: Rules for symbol sizes and layout variants to support different data capacities.
- Data encoding modes: Support and rules for Numeric, Alphanumeric, Byte, Kanji, Extended Channel Interpretation (ECI), FNC1 modes and mode-mixing strategies.
- Error correction: Error detection and correction capacity, generator polynomials and procedures for generating/decoding error correction codewords.
- Codeword placement & masking: Algorithms for placing codewords in the matrix and data mask patterns to optimize readability.
- Reference decoding algorithm: A normative decode procedure allowing interoperable implementations and auto-discrimination.
- Printing and marking requirements: Dimensional characteristics, human-readable interpretation, marking guidelines and print-quality parameters specific to rMQR.
- Conformance & quality assurance: Requirements and process-control measurements to ensure reliable symbol creation and scanning.
- Normative and informative annexes: Examples, byte mode character sets, print quality aspects, test procedures and user guidance.
Applications and Who Uses It
- When to use rMQR: Ideal for marking on small items or constrained surfaces where traditional QR codes don’t fit - e.g., electronics components, medical devices, pharmaceuticals, jewelry, small-pack retail tags, and certain identity documents.
- Primary users:
- Barcode symbology designers and integrators
- Software developers for barcode generators and decoders
- Scanner and imaging hardware manufacturers
- Label and direct-part-marking (DPM) printers
- Quality assurance and process control teams
- Regulatory/compliance officers specifying AIDC implementations
- Benefits: Enables compact, high-reliability data encoding with standardized error correction and decoding rules to maintain interoperability across scanners and printing technologies.
Related Standards
- Other QR and 2D barcode standards (for example, QR Code specifications such as ISO/IEC 18004)
- Print-quality and symbol grading standards used in AIDC workflows (see ISO/IEC print-quality standards)
- Implementation typically aligns rMQR usage with existing AIDC and supply-chain standards for interoperability.
Keywords: ISO/IEC 23941:2022, rMQR, Rectangular Micro QR Code, barcode symbology specification, automatic identification and data capture, error correction, encoding, decoding, printing quality.