ISO/IEC TS 20071-15:2017

TECHNICAL ISO/IEC TS
SPECIFICATION 20071-15
First edition
2017-12
Information technology — User
interface component accessibility —
Part 15:
Guidance on scanning visual
information for presentation as text in
various modalities
Technologies de l'information — Accessibilité du composant interface
utilisateur —
Partie 15: Recommandations relatives à la numérisation des
informations visuelles en vue d'une présentation sous forme de texte
selon différentes modalités
Reference number
©
ISO/IEC 2017
© ISO/IEC 2017, Published in Switzerland
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ii © ISO/IEC 2017 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Conformance . 3
5 Overview of scanning visual information for presentation as text in various modalities .3
5.1 General . 3
5.2 Contexts for scanning . 4
5.3 Framework for scanning. 4
5.4 Types of devices . 5
5.5 Type of software . 6
5.6 Scanning modes . 7
6 Guidance on scanning visual information for presentation as text in various modalities .8
6.1 General guidance . 8
6.1.1 Provide scanning results according to the purpose . 8
6.1.2 Provide scanning results equivalent to the object being scanned . 8
6.1.3 Provide focus adjustment . 8
6.1.4 Provide exposure adjustment . 8
6.1.5 Provide position adjustment . 9
6.1.6 Providing distance adjustment . 9
6.1.7 Provide orientation adjustment . 9
6.1.8 Provide accessible initiation of scanning . 9
6.1.9 Provide notification during scanning progress .10
6.1.10 Provide the scanning results in a textual representation .10
6.2 User preference settings .11
6.2.1 Enabling user preference settings .11
6.2.2 Selecting scanning modes .11
6.2.3 Selecting purpose of use.11
6.2.4 Selecting image resolution .11
6.2.5 Selecting image enhancement .11
6.2.6 Controlling presentation of visual guidance .11
6.2.7 Selecting post-processing components .12
6.2.8 Selecting modalities for textual representation .12
6.2.9 Selecting other application(s) to be invoked .12
6.2.10 Storing and retrieving user preferences . .12
6.3 Scanning input .12
6.3.1 General.12
6.3.2 Scanning/capturing appropriate images .13
6.3.3 Enhancing image quality .13
6.3.4 Recording scanned images .13
6.3.5 Naming scanned images .14
6.3.6 Retrieving scanned images for processing .14
6.4 Processing .14
6.4.1 General.14
6.4.2 Presenting results of processing .14
6.4.3 Pre-processing: selecting visual objects of interest . .14
6.4.4 Post-processing: respecting the context .15
6.5 Output .15
6.5.1 General.15
6.5.2 Presenting accessible scanning results .15
6.5.3 Invoking other applications: passing the scanning results .15
© ISO/IEC 2017 – All rights reserved iii

6.5.4 Privacy protection and security .16
Annex A (informative) Scanning visual information for presentation as text in various
modalities — Use cases .17
Annex B (informative) Checklist of recommendations .21
Bibliography .24
iv © ISO/IEC 2017 – All rights reserved

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical
activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work. In the field of information technology, ISO and IEC have established a joint technical committee,
ISO/IEC JTC 1.
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).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by ISO/IEC JTC 1, Information technology, SC 35, User interfaces.
A list of all parts in the ISO/IEC 20071 series can be found on the ISO website.
© ISO/IEC 2017 – All rights reserved v

Introduction
There are a wide variety of visual objects in a user's environment that provide information that could
be scanned and processed to output text-based information about or related to the object. Providing
text-based information can provide accessibility to diverse users in various contexts of use, including:
— persons who cannot see the information (due to vision or environmental limitations);
— persons who cannot approach the information closely enough to see it (due to physical or
environmental limitations);
— people who cannot understand the information (due to cognitive or linguistic limitations);
— where the information is provided in a format that human cannot directly understand (e.g. barcodes,
QR codes);
— where information content, beyond what is in the scanned image, can be obtained through additional
processing.
This document provides guidance on various aspects of the user interface of applications that scan
visual information. This includes selecting the types of information that are of interest to the user,
helping the user locate visual objects of interest, helping the user position the object or device used for
scanning, scanning the information, processing the scanned image, and outputting textual information
in various modalities.
The guidance contained in this d
...