ISO 15740:2013 写真—電子静止画イメージング—デジタル静止画写真デバイス用の画像転送プロトコル（PTP） | ページ 6

3.1

album

end-user-created object used to logically group data objects according to some user-defined criteria

Note 1 to entry: An album might or might not be a physical folder in a filesystem. In this International Standard, an album is a type of association.

3.2

association

logical construct used to expose a relationship between discrete objects

Note 1 to entry: Associations are used to indicate that separate data objects are related. Associations are represented like folders, and can be nested using a standard branched hierarchical tree structure.

3.3

connection

transport-provided mechanism for establishing paths for transferring data between devices

3.4

datacode

16-bit unsigned integer whose Most Significant Nibble (4 bits) is used to indicate the category of code and whether the code value is standard or vendor-extended

3.5

data object

image or other type of data that typically exists in persistent storage of a DSPD or other device

3.6

dataset

transport-independent collection of one or more individual data items with known interpretations

Note 1 to entry: Data sets are not necessarily opaque nor atomic to transport implementations.

3.7

Design Rule for Camera Filesystem

DCF

standard convention for camera filesystems which specifies the file format, foldering and naming conventions in order to promote file interoperability between conforming digital photography devices

3.8

device discovery

act of determining the set of all devices present on a particular transport or platform that are physically or logically accessible

3.9

digital still photography device

DSPD

device with persistent storage which captures a two-dimensional digital still image

3.10

Digital Print Order Format

DPOF

standardized ASCII file stored on removable media along with the image files that indicates how many copies of which images should be printed

Note 1 to entry: DPOF also allows index prints, cropping, and text overlays to be specified.

3.11

enumeration

act of creating an ordered increasing numerical list that contains one representative element for each member of a set

3.12

Exif/JPEG

compressed file format for digital cameras in which the images are compressed using the baseline JPEG standard described in ISO 12234‑2

Note 1 to entry: In Exif, metadata and thumbnail images are stored using TIFF tags within an application segment at the beginning of the JPEG file.

3.13

folder

optional sub-structure in a hierarchical storage area that can contain data objects

3.14

FlashPix

image file format, defined in FlashPix Format Specification, using a structured storage file containing metadata and a tiled, hierarchical image representation

Note 1 to entry: The tiles in a FlashPix image are normally baseline JPEG images, and individual image tiles of a particular resolution can be easily accessed for rapid display and editing.

3.15

IEEE 1394

high-speed serial bus standardized by the IEEE (Institute of Electrical and Electronics Engineers) currently having clock rates of 100, 200 and 400 Mbits/s

Note 1 to entry: IEEE 1394 is often referred to as FireWire.

3.16

image aspect ratio

ratio of the image width to the image height

3.17

image capture device

device for converting a scene or a fixed image, such as a print, film or transparency, to digital image data

3.18

image output device

device that can render a digital image to hardcopy or softcopy media

3.19

in-band event

event transmitted on the same logical connection as operations and responses

Note 1 to entry: Events are only asynchronous to the degree of data precision for which the transport implementation allows event interleaving.

3.20

initiator

device that initiates a conversation by opening a session, and issues all formal operations to the responder

Note 1 to entry: The initiator is analogous to the client in the client/server paradigm.

3.21

Infrared Data Association

IrDA

infrared wireless communication system that currently supports wireless communication at data rates between 9 600 bps and 4 Mbps

3.22

Joint Photographic Experts Group

JPEG

specific image compression method defined in ISO/IEC 10918‑1

3.23

LogicalStorageID

least significant sixteen bits of a StorageID

Note 1 to entry: This value uniquely identifies one logical storage area within the physical store indicated in the PhysicalStorageID.

3.24

Most Significant Nibble

MSN

most significant four bits of the most significant byte

3.25

object aggregation

act of taking one or more location-specific lists of objects that exist on a particular device and grouping them together in one set

3.26

ObjectHandle

device-unique 32-bit unsigned integer assigned by a device to each data object in local persistent storage which is provided to external devices

Note 1 to entry: External recipients of an ObjectHandle must use it to reference that piece of data in subsequent transactions. ObjectHandles are guaranteed to be persistent over at least a session.

3.27

out-of-band event

event transmitted on a different logical connection to that for operations and responses

Note 1 to entry: Out-of-band events are asynchronous from operation transactions.

3.28

personal computer

PC

any personal computing device, which may employ various hardware architectures and operating systems

3.29

PhysicalStorageID

most significant sixteen bits of a StorageID

Note 1 to entry: This value uniquely identifies one physical storage area on a device, although there may be more than one logical store per physical store.

3.30

Portable Network Graphics

PNG

extensible file format for lossless, portable, compressed storage of raster images

Note 1 to entry: PNG supports indexed colour, greyscale, truecolour and an optional alpha channel.

3.31

protocol

defined mechanisms for exchanging data between devices

3.32

pull model

use paradigm for DSPDs where the object receiver initiates the operation requests to transfer data objects from the sender

3.33

push model

use paradigm for DSPDs where the object sender initiates the operation requests to transfer data objects to the receiver

3.34

QuickDraw picture

file format consisting of sequences of saved drawing commands

Note 1 to entry: QuickDraw files are commonly referred to as PICT files.

3.35

responder

device that responds to operations from the initiator

Note 1 to entry: The responder is analogous to a server in the client/server paradigm.

3.36

session

logical connection between two devices defining a period of time during which obtained state information, such as handle persistence, may be relied upon

3.37

square pixel sampling

image having equal sample spacing in the two orthogonal sampling directions

3.38

StorageID

device-specific four-byte unsigned integer (UINT32) that represents a unique storage area that may contain data objects

Note 1 to entry: The most significant 16 bits of a StorageID represent the PhysicalStorageID, while the least significant 16 bits of a StorageID represent the LogicalStorageID.

3.39

transport aggregation

act of taking one or more transport-specific list of conforming devices that are logically or physically accessible in a system and grouping them in one set that spans all transports across the particular system

3.40

transport

means of attaching the digital capture device to some other digital device including a physical wire or a wireless connection

3.41

Universal Serial Bus

USB

digital interface for connecting up to 127 devices in a tiered-star topology