ISO/IEC 19794-9:2011

Overview

ISO/IEC 19794-9:2011 - Information technology - Biometric data interchange formats - Part 9: Vascular image data defines a standardized image interchange format for vascular biometric systems (vein/back-of-hand/palm/finger). The standard specifies a biometric data record format for storing, recording and transmitting vascular images and associated metadata to enable interoperability among capture devices, comparison algorithms and systems. Records conforming to ISO/IEC 19794-9 can be stored on machine‑readable media or transmitted over networks.

Key technical topics and requirements

• Data structure & conformance: Defines mandatory and optional fields, relationships between elements, and the need for an Implementation Conformance Statement (ICS) for producers and users.
• Image capture requirements:
  • Spatial sampling expressed in pixels per centimetre (no fixed minimum; application dependent).
  • Bit-depth: at least 8 bits per pixel (≥128 gray levels; ≥7 bits useful).
  • Illumination: near-infrared imaging commonly used (approx. 700–1200 nm); supports reflectance or transmission modes.
  • Projection & geometry: images must be orthographic; remove major optical distortions prior to packaging.
  • Pixel aspect ratio: default 1:1; non‑square pixels must be documented.
  • Standard pose & coordinate system: defines object-to-image mapping and raster scan order to ensure consistent orientation.
• Image storage & compression: Supports raw and compressed formats; references established codecs (ISO/IEC 10918-1 JPEG, ISO/IEC 15444-1 JPEG 2000, ISO/IEC 14495-1 lossless) for interchange.
• Record components: Biometric Data Record, general header, representation header, extended data, and registered format type identifiers are specified for robust metadata (scanning parameters, vendor-specific info, etc.).
• Byte/order conventions: Big‑endian multibyte values; most significant bit/byte transmitted first.

Practical applications and who uses this standard

• Use cases: Identity verification, secure access control, forensic and national ID systems, border control, and multi-modal biometric systems where vascular traits (vein patterns) are used.
• Stakeholders: Device manufacturers (vein scanners), biometric software developers, system integrators, standards bodies, government agencies, and organizations seeking vendor‑neutral vascular data exchange.
• Benefits: Ensures interoperability across vendors, preserves raw/processed image fidelity for algorithm portability, and provides a standardized metadata model for reliable matching and auditability.

Related standards

• ISO/IEC 19794 series (Parts 1–14) - framework and other biometric modalities (finger, face, iris, etc.).
• Normative references: ISO/IEC 10918-1 (JPEG), ISO/IEC 15444-1 (JPEG 2000), ISO/IEC 14495-1 (lossless compression).

Keywords: ISO/IEC 19794-9:2011, vascular image data, vascular biometric, biometric data interchange, vein recognition, image interchange format, conformance, NIR imaging, interoperability.