ISO/IEC 18004:2024 情報技術 — 自動識別およびデータ収集技術 — QR コード バーコード シンボル仕様 | ページ 6

3.1

character count indicator

bit sequence which defines the data string length in a mode (3.10)

3.2

data masking

process of XORing the bit pattern in the encoding region (3.4) with a data mask pattern to provide a symbol with more evenly balanced numbers of dark and light modules, and reduced occurrence of patterns which would interfere with fast processing of the image

3.3

data mask pattern reference

3-bit identifier of the data masking (3.2) patterns applied to the symbol

3.4

encoding region

region of the symbol not occupied by function patterns (3.8) and available for encoding data and error correction codewords, and for version (3.20) and format information (3.7)

3.5

exclusive subset

subset of characters within the character set of a mode (3.10) which are not shared with the more restricted character set of another mode

3.6

extension pattern

function pattern (3.8) in model 1 symbols, which does not encode data

3.7

format information

encoded pattern containing information on symbol characteristics essential to enable the remainder of the encoding region (3.4) to be decoded

3.8

function pattern

overhead component of the symbol (finder, separator (3.16) , timing patterns (3.19) and alignment patterns) required for location of the symbol or identification of its characteristics to assist in decoding

3.9

masking

process of XORing the bit pattern in an area of the symbol with a mask pattern to reduce the occurrence of patterns which would interfere with fast processing of the image

3.10

mode

method of representing a defined character set as a bit string

3.11

mode indicator

1-bit to 4-bit identifier (depending on symbol size) indicating in which mode (3.10) the following data sequence is encoded

3.12

padding bit

zero bit, not representing data, used to fill empty positions of the final codeword after the terminator (3.18) in a data bit string

3.13

remainder bit

zero bit, not representing data, used to fill empty positions of the symbol encoding region (3.4) after the final symbol character ここで, the area of the encoding region available for symbol characters does not divide exactly into 8-bit symbol characters

3.14

remainder codeword

pad codeword, placed after the error correction codewords, used to fill empty codeword positions to complete the symbol if the total number of data and error correction codewords does not exactly fill its nominal capacity

3.15

segment

sequence of data encoded according to the rules of one extended channel interpretation or encoding mode

3.16

separator

function pattern (3.8) of all light modules, one module wide, separating the finder patterns from the rest of the symbol

3.17

symbol number

3-bit field indicating the symbol version (3.20) and error correction level applied, used as part of the format information (3.7) in micro QR code symbols

3.18

terminator

bit pattern of defined number (depending on the symbol) of all zero bits used to end the bit string representing data

3.19

timing pattern

alternating sequence of dark and light modules enabling module coordinates in the symbol to be determined

3.20

version

size of the symbol represented in terms of its position in the sequence of permissible sizes for micro QR code symbols from 11 × 11 modules (version M1) to 17 × 17 modules (version M4) or, for QR code symbols, from 21 × 21 modules (version 1) to 177 × 177 (version 40) modules

Note 1 to entry: The error correction level applied to the symbol can be suffixed to the version designation, e.g. version 4-L or version M3-Q.

3.21

version information

encoded pattern in certain QR code symbols containing information on symbol version (3.20) together with error correction bits for this data