Electronic imaging — Test target for scanning of office documents — Part 3: Test target for use in lower resolution applications

ISO 12653-3:2014 specifies a test target for assessing the consistency of the output quality over time from lower resolution reflection scanning systems. It is applicable to assessing the output quality of black-and-white and colour scanners used for black-and-white or colour office documents, with or without half tone.

Imagerie électronique — Cible d'essai pour le scanning en noir et blanc des documents de bureau — Partie 3: Applications à plus faible résolution

General Information

Status
Published
Publication Date
25-Feb-2014
Current Stage
9093 - International Standard confirmed
Start Date
05-Jun-2019
Completion Date
05-Jun-2019
Ref Project

Buy Standard

Standard
ISO 12653-3:2014 - Electronic imaging -- Test target for scanning of office documents
English language
20 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 12653-3
First edition
2014-04-01
Electronic imaging — Test target for
scanning of office documents —
Part 3:
Test target for use in lower resolution
applications
Imagerie électronique — Cible d’essai pour le scanning en noir et
blanc des documents de bureau —
Partie 3: Applications à plus faible résolution
Reference number
ISO 12653-3:2014(E)
ISO 2014
---------------------- Page: 1 ----------------------
ISO 12653-3:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 12653-3:2014(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Uses of this part of ISO 12653 ................................................................................................................................................................. 2

4.1 General ........................................................................................................................................................................................................... 2

4.2 Factors affecting quality .................................................................................................................................................................. 2

5 Test target .................................................................................................................................................................................................................... 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Description of the test elements .............................................................................................................................................. 2

5.3 Base ................................................................................................................................................................................................................... 6

5.4 Test target for duplex scanners ................................................................................................................................................ 7

6 Procedures .................................................................................................................................................................................................................. 7

6.1 Initial system set-up ........................................................................................................................................................................... 7

6.2 Use of image enhancement and compression .............................................................................................................. 7

6.3 Test target scanning ............................................................................................................................................................................ 7

6.4 Internal test systems .......................................................................................................................................................................... 7

6.5 Frequency .................................................................................................................................................................................................... 7

7 Evaluation of the results ............................................................................................................................................................................... 7

7.1 Evaluation .................................................................................................................................................................................................... 7

7.2 Screen resolution .................................................................................................................................................................................. 8

8 Test method ............................................................................................................................................................................................................... 8

8.1 Test elements ............................................................................................................................................................................................ 8

8.2 Test procedures ...................................................................................................................................................................................... 8

Bibliography .............................................................................................................................................................................................................................20

© ISO 2014 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 12653-3:2014(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).

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 meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 171, Document management applications,

Subcommittee SC 1, Quality.

ISO 12653 consists of the following parts, under the general title Electronic imaging — Test target for

scanning of office documents:
— Part 1: Characteristics
— Part 2: Method of use
— Part 3: Test target for use in lower resolution applications
iv © ISO 2014 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 12653-3:2014(E)
Introduction

This part of ISO 12653 describes procedures for evaluating the quality of output from office document

scanning systems that are set to scan documents up to 300 dpi. The systems can be used to scan in black

and white, in greyscale, or in colour.

Test charts and targets already exist for micrographics and facsimile transmission but they are specific

to these said fields and do not meet the needs of the users of document scanning systems.

ISO 12653-1 specifies a test target for use in general scanning systems, to enable their performance

to be evaluated and to establish performance limits of the systems. Its method of use is specified in

ISO 12653-2.
© ISO 2014 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 12653-3:2014(E)
Electronic imaging — Test target for scanning of office
documents —
Part 3:
Test target for use in lower resolution applications
1 Scope

This part of ISO 12653 specifies a test target for assessing the consistency of the output quality over

time from lower resolution reflection scanning systems.

It is applicable to assessing the output quality of black-and-white and colour scanners used for black-

and-white or colour office documents, with or without half tone.

It does not apply to scanners used for the scanning of transparent or translucent documents.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 5-4:2009, Photography and graphic technology — Density measurements — Part 4: Geometric

conditions for reflection density.

ISO 446:2004, Micrographics — ISO character and ISO test chart No. 1 — Description and use.

ISO 3334:2006, Micrographics — ISO resolution test chart No 2 — Description and use.

ISO 12653-1:2000, Electronic imaging — Test target for the black-and-white scanning of office documents —

Part 1: Characteristics.

ISO 12653-2:2000, Electronic imaging — Test target for the black-and-white scanning of office documents —

Part 2: Method of use.
ISO 12653-2:2000 / Cor:1:2002
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12651 and the following apply.

3.1
test element
pattern represented on a target
EXAMPLE Millimetre scale, grey scale, circle.
3.2
continuous tone
tonal variation in a document represented by areas of different density
3.3
lower resolution application
scanning system that is configured to scan up to 300 dpi
© ISO 2014 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 12653-3:2014(E)
4 Uses of this part of ISO 12653
4.1 General

The method described in Clause 8 of this part of ISO 12653 for assessing the output quality of office

document scanners (both black-and-white and colour) can be used in the following:

— to initially set up the system to yield satisfactory images;
— to check for consistent quality;
— to check that equivalent performance is being obtained from another system.

If the whole system is checked, from input to output, the results obtained can vary depending on the

different items of equipment used. For example, one visual display unit screen can be poorly set up,

giving worse quality than a well set up screen. It is thus important to establish the parts of the system

on which to perform the tests. If tests of other parts of the system are required, then the tests should be

repeated as appropriate.

The regular use of these procedures should enable a given level of quality to be maintained. The method

is intended
— to enable the operator to check that the scanner is correctly set up,
— to inform the operator of the capabilities and limits of the scanner,
— to enable the user to monitor image quality over a period of time, and
— to enable the user to draw up quality assessment procedures.
4.2 Factors affecting quality
Factors which affect the quality achieved by a document scanning system are
— physical scanning irregularities,
— uniformity of exposure,
— chromatic sensitivity of the photosensing unit,
— contrast,
— threshold setting,
— reproduction of half-tones,
— resolution, and
— scale.
5 Test target
5.1 General

The black and white and colour test targets specified in this part of ISO 12653 include characters and

graphics as test elements.
5.2 Description of the test elements

The test target shall comprise of the following display elements, arranged as shown in Figures 1 and 2.

2 © ISO 2014 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 12653-3:2014(E)
The test target shall include the words “FOR USE AT UP TO 300 dpi ONLY”.

The test elements on the targets should be of such quality that scanners being assessed reach a point of

failure. Determination of this point will enable the user to ascertain the characteristics of documents

that are unlikely to produce an acceptable image.

NOTE The sample layout of the test target shown in Figure 1 is a reduced reproduction. The test target would

normally fill a whole A4 size page.

The test elements as described below refer to the areas on the test target as indicated by the area letters

shown in Figure 2.
a) Area A:

— 10-mm–wide frame subdivided into 2 mm parallel lines which delineate the outer edge of the target;

— 12 arrow-shaped elements, three on each side of the target, whose outward points touch the outer

edges of the target.
b) Area B:

— diagonal line with two marks 300 mm apart designating the ends of the diagonal line and end marks

are equidistant from the centre of the target. (The line is blanked out where it crosses elements K

and N.)
c) Area C:

— three equally spaced concentric circles with a cross indicating their centre point;

— a Pestrecov star pattern, with associated areas indicating frequency in lines per millimetre at each

of the clear circles of the star, is composed of tapered black and white radial lines over 360° having

equal angular frequency and concentric white circles at frequencies equivalent to 1,8 lines per

millimetre, 2,5 lines per millimetre, and 3,6 lines per millimetre.
d) Area D:

— group of international standard characters (see ISO 446) having heights in the R20 series,

56 μm x 10 to 280 μm x 10.
e) Area E:

— selection of characters of various sizes and type styles, including at least one serif and at least one

sanserif font, with the smallest character size used smaller than the smallest character size normally

scanned by the system. The character size and type style used can be indicated on the test target.

Characters used can be Latin type and/or non-Latin type depending upon end-user requirements.

White characters on a black background can be added if appropriate.
f) Area F:

— two ISO No 2 test charts (see ISO 3334) having frequencies in the R20 series 2,0 to 7,1 line pairs/mm.

One test chart shall be aligned at 45° to the line of scanning.
g) Area G:

— two contiguous rectangles each divided into 10 zones; one rectangle shall have a white background

and the other shall have a black background. Each rectangle shall have lines of opposite polarity

progressively changing zone-by-zone in width from 0 to 0.5 mm. Where these lines cross zone

boundaries, they shall be of opposite polarity to the line. Line widths shall be indicated. One test

chart shall be aligned at 90° to the line of scanning, a second test chart shall be aligned to the

direction of scanning.
h) Area H:
© ISO 2014 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 12653-3:2014(E)

— horizontal and vertical rectangular areas of uniform visual diffuse reflection density, measured in

accordance with ISO 5-4, minimum density 1,2.
i) Area I:
— selection of widely spaced small non-alphanumeric characters.
j) Area J:

— area of background (white) colour at least 30 mm x 30 mm, delineated by a black border of at least

1mm width.
k) Area K:

— four scales of half-tone wedges, each wedge ranging from 10 % to 100 % in increments of 10 %, one

each in cyan, magenta, yellow and black at screen size 6,9 lines/mm.

NOTE The grey scale range represents the percentage of black to white in the half-tone.

l) Area L:

— four areas of uniform continuous density, ranging in steps from 0,3 to 1,2 density.

m) Area M:

— two scales of half-tone grey wedges at different screen sizes, each wedge ranging from 0 % to 90 %

in increments of 10 % at screen sizes 3,3 and 6,9 lines/mm.
n) Area N:

— six ladder patterns, three in each direction. Ladder patterns shall be at 1,8, 2,5 and 3,6 lines/mm.

o) Area O:
— colour image with areas of varying colours.
p) Area P:

— arrows to indicate in which direction the target shall be placed in the scanner.

4 © ISO 2014 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 12653-3:2014(E)
Figure 1 — Sample layout of test target
© ISO 2014 – All rights reserved 5
---------------------- Page: 10 ----------------------
ISO 12653-3:2014(E)
Figure 2 — Layout of target area (see 4.2)
5.3 Base

The test target shall be made on a white opaque base with a glossy surface. The base size shall be that

typical of documents normally scanned (for example, A4).
6 © ISO 2014 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 12653-3:2014(E)
5.4 Test target for duplex scanners

The target described in 5.2 may be created as a single-sided or as a double- sided target. Where double

sided, there shall be identical designs on the two sides, except for an indication of the side (e.g. Front,

Back) displayed.
6 Pro
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.