ISO 20947-1:2021

Overview

ISO 20947-1:2021 - Performance evaluation protocol for digital fitting systems - Part 1: Accuracy of virtual human body representation defines how to quantify and visualize differences between a real human body and its digital representation. The standard sets out a performance evaluation protocol for systems that create virtual human body models (including virtual fit mannequins) from 3D body scan data and/or body dimension inputs. It clarifies required functions, measurement and reporting practices, and emphasises that the required accuracy depends on the intended use of the digital fitting system.

Key topics and technical requirements

• Scope and definitions: Precise terminology for virtual human concepts (virtual clone, virtual twin, virtual fit mannequin) and the digital fitting system environment.
• Functional requirements of virtual human modelling systems: Expected capabilities such as data import/export, landmark extraction, body-dimension input, cross‑section creation, visualization and symmetrisation.
• Evaluation protocol for body dimensions: Methods to compare virtual body dimensions to reference (manual) measurements and to quantify errors in body dimensions.
• Cross sections and projection views: Procedures to create and compare torso cross sections, bounding-rectangle dimensions, and front/side/back projections to visualise shape differences.
• Subject selection and reporting: Guidance on selecting subject populations for evaluation, and standardized report formats (normative Annex A and informative examples in Annexes B–E).
• Interoperability with scan accuracy standards: Directs users to evaluate scan-derived measurement accuracy per ISO 20685-1; references ISO 8559-1 and ISO 18825 for anthropometric definitions and vocabulary.

Practical applications and who uses this standard

ISO 20947-1 is relevant to anyone developing, validating or using digital fitting technologies:

• Apparel designers, pattern makers and technical developers assessing virtual fit fidelity.
• Manufacturers and retailers deploying virtual try‑on and size recommendation systems.
• Developers of 3D body scanning and virtual human modelling software (virtual clones, parametric/virtual twins).
• Educational institutions and researchers working on anthropometry, digital garments, and ergonomics.
• Quality managers who need documented evaluation and reporting protocols for virtual fit mannequins.

Use cases include validating a virtual twin created from body dimensions, comparing a scan-derived virtual clone against manual measurements, and producing standardised evaluation reports for procurement or compliance.

Related standards

• ISO 20685-1 - 3-D scanning methodologies; evaluation protocol for body dimensions extracted from 3‑D body scans.
• ISO 18825-1 / ISO 18825-2 - Vocabulary for digital fittings and attributes of virtual human bodies.
• ISO 8559-1 - Anthropometric definitions for body measurement.

ISO 20947-1:2021 provides a structured, repeatable way to evaluate the accuracy of virtual human body representations, helping stakeholders choose and validate digital fitting systems that meet their accuracy needs.