ISO/IEC 12087-5:1998 情報技術—コンピュータグラフィックスと画像処理—画像処理と交換（IPI）—機能仕様—パート5：基本的な画像交換フォーマット（BIIF） | ページ 5

3.1.1

Attachment Level

A field value of a segment that indicates the display level of the segment to which it is attached. It provides a way to associate images and symbols as a group for the purpose of moving, rotating or displaying.

3.1.2

Annotational Text

See Symbol Text.

3.1.3

Band

One of the two-dimensional (row/column) arrays of pixel sample values that comprise an image. For the basic use of BIIF, the band values are homogeneous data types for each band. In the case of monochrome or indexed colour images (single 2 dimensional array of pixel values with possible look-up-tables), the image array consists of one band. In the case of RGB images (three 2-dimensional arrays of pixel values; 8 bits each of Red, Green and Blue values for each pixel), the image consists of three bands. When images need to be represented using bands with heterogeneous array structure or data types (eg., two bands with integer data type and one band with a real data type), the image representation may be defined using a PIKS object in a TFS Data Extension Segment (DES). The TFS PIKS object defines the data structure of the values in the image data field of the image segment.

3.1.4

Basic Character Set (BCS)

A subset of ISO/IEC 10646-1 character set which is represented by the UTF-8form and used in headers and subheaders.

3.1.5

Basic Character Set-Alphanumeric (BCS-A)

A subset of the Basic Character Set. The range of allowable characters consists of space through tilde (single octets with values ranging from 20 to 7E) from the Basic Latin Collection.

3.1.6

Basic Character Set-Numeric (BCS-N)

A subset of the Basic Character Set which consists of the digits ‘0’ through ‘9’, ‘plus sign’, ‘minus sign’, ‘decimal point’, and ‘slash’.

3.1.7

Basic Multilingual Plane

The Basic Multilingual Plane (BMP) is defined as group 00 of plane 00. The BMP includes characters in general use in alphabetic, syllabic, and ideographic scripts together with various symbols and digits. See ISO/IEC 10646-1:1993.

3.1.8

Block

A rectangular array of pixel values which is a subset of an image. An image consists of the union of one or more nonoverlapping blocks.

3.1.9

Byte

A byte is defined as equivalent to an octet.

3.1.10

Common Coordinate System

A two dimensional coordinate space which is common for determining the placement and orientation of displayable data types within a specific BIIF file and among correlated BIIF files which comprise an integrated product.

3.1.11

Conditional

An adjective applied to data fields whose existence depends on the value of the designated Required field preceding the Conditional field.

3.1.12

Coordinated Universal Time (UTC)

The time scale maintained by the Bureau International de L'Heure (International Time Bureau) that forms the basis of a coordinated dissemination of standard frequencies and time signals. UTC is equivalent to the mean solar time at the prime meridian at Greenwich, England.

3.1.13

DES

Data Extension Segment is a construct used to encapsulate different data types where each type is encapsulated in its own DES. The DES structure is discussed in Subclause 4.2.8.2.

3.1.14

Displayable

Information that can be exhibited in visual form.

3.1.15

Display Level

A field value of a segment that denotes the order in which the segments (images and symbols) are “stacked”. Level order is independent of the data sequence order in this format.

3.1.16

Field

Logically primitive item of data, sometimes referred to as an attribute.

3.1.17

Image

A representation of physical visualization, for example, a picture. An image is the computer (digital) representation of a picture. An image is comprised of discrete picture elements called pixels structured in an orderly fashion consisting of pixel value arrays formatted using bands and blocks.

3.1.18

International Standardized Profile

An internationally agreed-to, harmonized document which identifies a standard or group of standards together with options and parameters necessary to accomplish a function or set of functions.

3.1.19

Look-Up Table

A collection of values used for translating image samples from one value to another. The current sample value is used as an index into the look-up table(s); therefore, the number of entries in each look-up table for a single bit per pixel image would contain two entries, and each look-up table for an 8-bit per pixel image would contain 256 entries. Multiple look-up tables allow for the translation of a scalar pixel value to an n-dimensional vector pixel value.

3.1.20

Non-blank

Non-blank indicates that the field cannot be filled entirely by the BCS-A space character (0x20). characters when included with other characters.

3.1.21

Octet

An octet is defined as 8 bits.

3.1.22

Pad Pixel

A pixel with sample values that have no significant meaning to the image. Pad pixels are used with block images when either the number of pixel rows in an image is not an integer multiple of the desired number of vertical image blocks, or when the number of pixel columns in an image is not an integer multiple of the desired number of horizontal image blocks.

3.1.23

Pad Pixel Mask

A data structure which identifies recorded/transmitted image blocks which contain pad pixels. The pad pixel mask allows applications to identify image blocks which require special interpretation due to pad pixel content.

3.1.24

Pixel

An abbreviation for the term “picture element”.

3.1.25

Profile

A set of one or more base standards, and where applicable, the ¡dentification of chosen classes, subsets, options, and parameters of those base standards, necessary for accomplishing a particular function.

3.1.26

Profile Variant

A field within this basic standard that is allowed to be defined by a profile for its structure and intent (content). An element or an attribute that is allowed to differ between profiles.

3.1.27

Required

An adjective applied to data fields that must be present and filled with valid data or default data.

3.1.28

RES

The Reserved Extension Segment (RES) construct provides the same mechanism as the DES construct for adding new data types for inclusion in BIIF files. However, the RES is reserved for data types that need to be placed at or near the end of the file. The RES structure is discussed in Subclause 4.2.8.4.

3.1.29

Sample

One element in the image array that comprises an attribute of the image. In BIIF, a sample (pixel vector value) is indexed according to the row and column of the array where it appears.

3.1.30

SAR

Image obtained from a synthetic aperture radar.

3.1.31

SARIQ

Radio hologram (initial phase information) from a synthetic aperture radar.

3.1.32

Segment

An instance of a data type that is contained in a BIIF file. A segment is comprised of a subheader and associated data (e. g., an image subheader together with image data comprises an image segment).

3.1.33

Symbol

A pictorial element that may be aligned with a point in or adjacent to an image to provide graphical markings and/or textual labels.

3.1.34

Symbol Text

Text placed on or adjacent to an image as a graphic symbol to provide a textual overlay to the image.

3.1.35

Tagged Record Extension (TRE)

A means to provide additional attributes about standard data segments not contained in the standard header or sub-header fields.

3.1.36

Transportable File Structure

Transportable File Structure is a data extension element used for configuration, data request, commands, and PIKS object data to be stored in hierarchy order with Metadata associated for each level. TFSs are defined and demonstrated in Annex A.

3.1.37

Transparent Pixel

A pixel whose sample values must be interpreted for display such that the pixel does not obscure the display of any underlying pixel.

3.1.38

YCbCr

Technique for specifying colour images where Y = Brightness of signal, Cb = Chrominance (blue), Cr = Chrominance (red)