ISO 12234-1:2007
(Main)Electronic still-picture imaging — Removable memory — Part 1: Basic removable-memory model
Electronic still-picture imaging — Removable memory — Part 1: Basic removable-memory model
ISO 12234-2:2007 specifies a basic removable-memory reference model for digital electronic still-picture cameras. The reference model includes image file formats for storing image data and metadata, filing system requirements for storing and retrieving the image files on the removable memory, and media profiles which are specific to a given storage technology. The reference model allows the image data and metadata to be interchanged among the various components of an electronic imaging system by using the removable storage media.
Imagerie de prises de vue électroniques — Mémoire mobile — Partie 1: Modèle de mémoire mobile de base
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 12234-1
Second edition
2007-10-15
Electronic still-picture imaging —
Removable memory —
Part 1:
Basic removable-memory model
Imagerie de prises de vue électroniques — Mémoire mobile —
Partie 1: Modèle de mémoire mobile de base
Reference number
ISO 12234-1:2007(E)
©
ISO 2007
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ISO 12234-1:2007(E)
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ISO 12234-1:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Reference model.2
4.1 General considerations.2
4.2 Image storage application profiles (ISAP) .3
4.3 Image data format.3
4.4 Filing system.4
4.5 Media profiles.4
5 Required characteristics for image storage application profiles .4
5.1 General.4
5.2 Interoperability.4
5.3 Flexibility .4
5.4 Extensibility.4
5.5 Ease of implementation .4
5.6 Platform independence .5
5.7 Multiple physical media types .5
5.8 Elimination of redundancy.5
6 Image data format specification.5
6.1 General considerations.5
6.2 Application layer for image data .5
6.3 Presentation layer for image data.5
6.4 Image data formats.5
6.5 Application layer for sound data.12
7 Filing system requirements.12
7.1 General considerations.12
7.2 Directory structure and name.12
7.3 Object.13
7.4 Interoperability.13
7.5 Device requirement level .14
Annex A (normative) TIFF/EP image data format .15
Annex B (informative) SISRIF image data format .16
Annex C (informative) Exif image data format .17
Annex D (informative) DCF filing system.18
Bibliography .19
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ISO 12234-1:2007(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 12234-1 was prepared by Technical Committee ISO/TC 42, Photography.
This second edition cancels and replaces the first edition (ISO 12234-1:2001), which has been technically
revised.
ISO 12234 consists of the following parts, under the general title Electronic still-picture imaging — Removable
memory:
⎯ Part 1: Basic removable-memory model
⎯ Part 2: TIFF/EP image data format
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ISO 12234-1:2007(E)
Introduction
The ISO 12234 series addresses removable memory requirements for electronic still cameras. Unlike a
traditional photographic system, an electronic photography system divides the imaging chain into discrete
components separately devoted to image acquisition, storage, transmission, processing and display. Since
the components may be made by different manufacturers, there is a need to specify a standard format for
data interchange among the various components of an electronic imaging system.
This part of ISO 12234 describes data interchange using a removable storage media. The purpose of the
removable storage media is to store images digitally in a media that is compact, low in power, and
mechanically rugged. These removable storage media will be used to transport the data to other components
in the imaging chain. This part of ISO 12234 further specifies the required information content for a removable
memory data format. The information content includes both the image data and data items describing the
image. Normative Annex A and informative Annexes B and C describe various conforming formats. The data
features supported by each of these formats are also described in Clause 6. The information content further
includes the filing system which organizes the image data. Informative Annex D describes a conforming filing
system. The filing system features are described in Clause 7.
An implementation is said to be in compliance if, at a minimum, all mandatory elements are present.
Recommended features are not required, but will substantially enhance interoperability, performance and/or
robustness.
In developing this part of ISO 12234, a structured methodology was followed. A reference model describes the
environment as well as the overall architecture in which this part of ISO 12234 is applicable. The architecture
separates the software-only layers, termed the image data format and the filing system, from the hardware
technology-dependent layers, termed the media profile. An image data format is media independent and
contains the image data, image related data and a means for structuring these data elements. A filing system
defines the data organization on the storage media used but which is independent of the media.
The International Organization for Standardization (ISO) draws attention to the fact that it is claimed that
compliance with this document may involve the use of patents.
ISO takes no position concerning the evidence, validity and scope of these patent rights.
The holders of these patent rights have assured ISO that they are willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect,
the statements of the holders of these patent rights are registered with ISO. Information may be obtained
from:
⎯ Eastman Kodak Company
Attention: Director, Corporate Commercial Affairs
343 State Street
Rochester, New York, USA 14650-0211
⎯ Konica Minolta Technology Center, Inc.
Attention: General Manager, Intellectual Property Center
No.1 Sakura-machi, Hino-shi
Tokyo 191-8511, Japan
⎯ FUJIFILM Corporation
Attention: Industrial Standards Office
7-3, Akasaka 9-chome, Minato-Ku
Tokyo 107-0052 Japan
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ISO 12234-1:2007(E)
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights other than those identified above. ISO shall not be held responsible for identifying any or all such patent
rights.
With the permission of Adobe Systems Incorporated, numerous tag names and values used in this part of
ISO 12234 have been copied verbatim from the TIFF 6.0 specification dated June 3, 1992, specification
copyright 1986-1988, 1992 Adobe Systems Incorporated.
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INTERNATIONAL STANDARD ISO 12234-1:2007(E)
Electronic still-picture imaging — Removable memory —
Part 1:
Basic removable-memory model
1 Scope
This part of ISO 12234 specifies a basic removable-memory reference model for digital electronic still-picture
cameras. The reference model includes image file formats for storing image data and metadata, filing system
requirements for storing and retrieving the image files on the removable memory, and media profiles which
are specific to a given storage technology. The reference model allows the image data and metadata to be
interchanged among the various components of an electronic imaging system by using the removable storage
media.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 12232, Photography — Digital still cameras — Determination of exposure index, ISO speed ratings,
standard output sensitivity, and recommended exposure index
ISO 12233, Photography — Electronic still-picture cameras — Resolution measurements
ISO 12234-2, Electronic still-picture imaging — Removable memory — Part 2: TIFF/EP image data format
ISO 14524, Photography — Electronic still-picture cameras — Methods for measuring opto-electronic
conversion functions (OECFs)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
filing system
software structure which specifies how the data is logically organized on a given storage media
3.2
image data format
structure and content which specify image data and the organization of the image related data in a device
independent manner
3.3
image storage application profile
ISAP
media profile, the filing system and the image data format
NOTE The ISAP specifies all the information necessary to completely implement the removable memory.
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ISO 12234-1:2007(E)
3.4
media profile
portion of the memory module specification which is specific to a given memory technology; including the form
factor, interconnection and access protocol
3.5
memory card
specific type of memory module with a physical form factor no larger than that of a credit card in outline and
approximately 85 mm × 55 mm in size
3.6
memory module
physical implementation of the removable memory, containing the image data format combined with a
specified physical form factor, interconnect definition and access protocol
3.7
removable memory
storage in a user removable form factor, which is transportable, and intended for the digital storage of image
data in electronic still cameras
NOTE The memory media can be read/write, write once, etc., but has to be non-volatile when removed from the
camera so as to retain the data.
3.8
sound compression
process of altering the sound data coding in order to reduce the size of a sound file in the electronic still
picture camera
cf. sound recording (3.9).
3.9
sound recording
recording of the sound data relative to an image acquired by the electronic still camera
NOTE 1 The sound recording can be made before, during, or after the time of the image acquisition.
NOTE 2 A sound recording attached to an electronic still picture is considered an annotation of the image, as
distinguished from a sound recording which is attached to and synchronized with motion pictures or video pictures.
4 Reference model
4.1 General considerations
Table 1 summarizes the reference model for this part of ISO 12234. The reference model is a layered model.
The implementation of any one layer can be changed without affecting the implementation of any other layer.
The reference model describes the types of elements included in each layer.
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ISO 12234-1:2007(E)
Table 1 — Reference model for removable storage
Layer Intent Examples Implementation
Application Content-image data Image data Image data format
and parameters
Presentation Define structure of image data Tags or tuples
and encoding mechanism
Session Define data organization Filing system for image Filing system
on media storage/retrieval
Transport Communication of data across Data transmission protocol Media profile
a channel
Network Conformance layer Compatibility and interoperability
with other systems
Data link a) Assures reliable data a) Card information structure
read/write
b) Error correction methods
b) Storage media specific
c) Control for insert/removal
recording information
Physical Assure basic compatibility a) Form factor, pin alignment,
in physical form factor size
and electrical signals
b) Electrical interface
specification
c) Protocol/command sets
4.2 Image storage application profiles (ISAP)
The ISAP completely specifies all the information necessary to implement a particular type of removable
storage. The image storage application profile consists of three parts:
⎯ the image data format, which describes the structure and content of the image data;
⎯ the filing system, which describes how the image files are stored and retrieved;
⎯ the media profile, which describes the media used to store the image files.
4.3 Image data format
The image data format consists of the application and presentation layers. The application layer defines the
content of the image data. The presentation layer defines the encoding of the image data. This part of
ISO 12234 specifies image data formats that are consistent across implementations and independent of the
media used for storage.
The content defined in the application layer includes the image and image related information, called
metadata, such as the date the image was captured. The encoding defined in the presentation layer includes
the structures which define the image and the image related information as digital values. For example, the
encoding describes whether the image is stored as strips or tiles, and whether the metadata is stored as
numbers or characters. The detailed elements in three allowed image data formats are described in Clause 6.
The image data formats described in this part of ISO 12234 provide an explicit binding between the content in
the application layer and the encoding method given in the presentation layer.
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ISO 12234-1:2007(E)
4.4 Filing system
The filing system definition includes the information required for the session layer. It defines the data
organization on the storage media used.
4.5 Media profiles
Many different removable memory types are used in digital electronic still-picture cameras. The storage
technologies include various solid state memory cards, magnetic hard drives and optical discs. Each of these
removable memory types can be described by an appropriate media profile.
The media profile definition includes the information required for the transport, network, data link and physical
layers. The transport layer defines the protocol for how this data is transported between the digital electronic
still-picture camera and the removable memory. The network layer describes the conformance requirements
needed to maintain compatibility and interoperability with other systems. The data link layer describes the
mechanisms for assuring reliable communications, and the specifications for reading, writing, erasing,
removing and inserting specific types of media. The physical layer assures the basic compatibility of the
physical and electrical interface. It defines the physical form factor, connector specifications and electrical
interface specifications.
5 Required characteristics for image storage application profiles
5.1 General
The characteristics required for suitable image data formats and media profiles are specified in 5.2 to 5.8.
These criteria were used in the development of this part of ISO 12234 and will be used in developing its future
versions.
5.2 Interoperability
This part of ISO 12234 fosters interoperability between systems manufactured by different vendors. Here
interoperability permits
a) storage of image data on a removable medium,
b) removal of that media from a digital electronic still-picture camera,
c) insertion of that media into a second system, and
d) transfer of the image data to the second device.
5.3 Flexibility
This reference model permits flexibility across applications requiring different levels of feature sets. Some
image formats allow default values for specific data elements in order to simplify the implementation.
5.4 Extensibility
This reference model allows for various extensions to provide the possibility of incorporating new features.
Some image data formats include the capability for private extensions to meet special needs. In future
revisions of this part of ISO 12234, new features may be added to the present image data formats. In addition,
new media profiles or image data formats may be included.
5.5 Ease of implementation
This reference model allows easy and unambiguous implementation. In particular, many electronic still-picture
cameras have limited processing power and even many of the hosts reading the data may have limited
processing power. Hence, the standard format requires minimal encoding and decoding of the image data.
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ISO 12234-1:2007(E)
5.6 Platform independence
Because it will be necessary to exchange data between different hardware platforms running under different
operating systems, this reference model is platform independent. In particular, the data and data structures
presented to the application are platform independent.
5.7 Multiple physical media types
This reference model supports multiple physical media types. Media based on various different storage
technologies, e.g. solid state EEPROM and rotating magnetic disc storage, are supported for use as
removable storage media in electronic still-picture cameras.
5.8 Elimination of redundancy
Information should appear once and only once within the image data format. This prevents conflicts if the data
is entered in two different places and happens to be inconsistent. If a type of information appears in multiple
places, the data written needs to be consistent, e.g. by assigning equivalent values. This applies both to
explicitly entered data and to data implicitly derived from other fields.
6 Image data format specification
6.1 General considerations
The image data format corresponds to the application and presentation layers of the reference model, and is
independent of the storage media used. The image data formats described in Annexes A, B, C, and D are
intended for use as image interchange formats for photographic images within the scope of the reference
model. It is recognized that images from sources other than electronic still-picture cameras may use different
image data formats.
6.2 Application layer for image data
The application layer defines what image data may be present in the information to be exchanged between
systems. The data defined here determines what information is available to a host system about the image,
the picture-taking conditions, the camera system which took the image and any annotations to help describe
the image for the user. Table 2 represents a list of image data features that should be included in an image
data format.
6.3 Presentation layer
The presentation layer defines what data may be present in the information to be exchanged between
systems. The data defined here describes the organization of data in the format. It is media independent.
6.4 Image data formats
It is recognized that different applications require different levels of support. Some applications are highly
standardized with many of the data elements assuming default values, while other applications require more
flexibility. To accomodate different applications, three different image formats, TIFF/EP, Exif, and SISRIF, are
allowed. The image data formats differ in their required elements and degree of flexibility. When used, the
TIFF/EP image data formats (see Annex A) shall be used in accordance with ISO 12234-2. The Exif image
format is described in Annex B. The SISRIF image format is described in Annex C. The use of the SISRIF
image data format in new electronic still picture imaging systems is not encouraged. The DCF filing system is
described in Annex D.
The use of the SISRIF image data format in new electronic still-picture imaging systems is not encouraged.
Table 2 summarizes the image data features supported by the allowed image data formats. One of them is
supported by a specific filing system. For each image data format, the support for the feature can be
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ISO 12234-1:2007(E)
mandatory, recommended, optional or not used. Further information concerning implementation of each
format is contained in the informative annexes.
Different requirements are imposed on writing, reading and editing devices by the image data format. The
writing device should support all mandatory features, but need not support features listed as recommended or
optional. The reading device should support all mandatory features, and also should support optional or
recommended features at least to the extent of allowing the image to be interpreted without corrupting the
data. Therefore, a reader may ignore recommended or optional features as long as it is done so in a safe
manner. If an editor ignores some features, it is required that the ignored features be passed along
unchanged as part of the data file, rather than truncating or eliminating them. This permits the previously
ignored features to be interpreted by a subsequent reader.
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ISO 12234-1:2007(E)
Table 2 — Image data feature descriptions and requirements, with field names and codes
a b, c, d e
Feature name Description SISRIF Exif TIFF/EP
Status Status Status
Tuple code, Tag code, Tag code,
parameter applicability applicability
Camera information
1 Make Manufacturer of camera that NU R M
captured the image (ASCII)
271 271
2 Model Model number of the camera NU R M
that captured the image (ASCII)
272 272
3 Software Version of software or firmware NU O M
version within camera (ASCII)
305 305
Camera/lens characterization
4 ISO speed ISO speed of the camera, as NU O O
defined in ISO 12232
34855 34855
5 Focal length Focal length of the lens NU O O
37386 37386
6 Interlace scan Field number of multi-field O NU O
images
90h, 34857
scanning system
7 Spatial Electro-optical spatial frequency NU O O
frequency response of the camera, as
41484 37388
response defined in ISO 12233
8 Noise The rms noise levels of each NU NU O
camera channel at one or more
37389
signal levels.
9 Opto-electronic The relationship between the NU O O
conversion focal plane or input scene
34856 34856
function luminances and the digital
output levels, as defined in
(OECF)
ISO 14524
10 Focal plane X Number of pixels in the focal NU O R
resolution plane in the X-direction, per
41486 37390
focal plane resolution unit
11 Focal plane Y Number of pixels in the focal NU O R
resolution plane in the Y-direction, per
41487 37391
focal plane resolution unit
12 Focal plane Measurement unit for focal NU O R
resolution unit plane resolution data
41488 37392
13 Max aperture Minimum f-number camera can NU O O
value attain, in APEX units
37381 37381
14 CFA pattern Colour filter array pattern on NU O O
sensor
41730 33422
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ISO 12234-1:2007(E)
Table 2 (continued)
a b, c, d e
Feature name Description SISRIF Exif TIFF/EP
Status Status Status
Tuple code, Tag code, Tag code,
parameter applicability applicability
Image annotation
d
15 Date time Date and time of image capture O O/M R
original
81h 36867 36867
d
16 Date time Date and time of image digitized NU O/M NU
digitized
36868
17 D
...
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