ISO 20498-2:2017

INTERNATIONAL ISO
STANDARD 20498-2
First edition
2017-05
Traditional Chinese medicine —
Computerized tongue image analysis
system —
Part 2:
Light environment
Médecine traditionnelle chinoise — Système d’analyse d’images
numérisées de la langue —
Partie 2: Environnement lumineux
Reference number
ISO 20498-2:2017(E)
©
ISO 2017

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ISO 20498-2:2017(E)

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ii © ISO 2017 – All rights reserved

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ISO 20498-2:2017(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical requirements . 1
4.1 Illuminance. 1
4.2 Colour temperature . 2
4.3 Colour rendering index . 2
4.4 Illumination distribution. 2
4.5 Irradiance . 2
4.6 Ultraviolet irradiance . 2
5 Test methods . 2
5.1 Measuring points on effective surface area . 2
5.2 Illuminance. 3
5.3 Colour temperature . 3
5.4 Colour rendering index . 3
5.5 Illumination distribution. 3
5.6 Irradiance . 3
5.7 Ultraviolet irradiance . 4
Annex A (informative) Spectral weighting function for assessing ultraviolet hazards .5
Bibliography . 6
© ISO 2017 – All rights reserved iii

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ISO 20498-2:2017(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
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