ISO/IEC TR 23008-15:2018 情報技術—異種環境での高効率コーディングとメディア配信—パート15：シグナリング、下位互換性、HDR / WCGビデオの表示適応 | ページ 6

3.1

dynamic range adaptation

DRA

mapping process to convert content from one colour volume to another colour volume

3.2

electro-optical transfer function

EOTF

function which converts a non-linear video signal into a quantity of output linear light

Note 1 to entry: An example of output linear light is light emitted by a display.

3.3

full range

range in a fixed-point (integer) representation that spans the full range of values that could be expressed with that bit depth, such that, for 10-bit signals, black corresponds to code value 0 and peak white corresponds to code value 1023 for Y′

Note 1 to entry: As per the full range definition from Rec. ITU-R BT.2100-1.

3.4

hybrid log-gamma

HLG

one set of transfer functions offering a degree of compatibility with legacy displays by more closely matching the previously established television transfer curves

Note 1 to entry: Sets of transfer functions related to HDR signals are specified in Rec. ITU-R BT.2100-1.

3.5

narrow range

range in a fixed-point (integer) representation that does not span the full range of values that could be expressed with that bit depth such that, for 10-bit representations, the range from 64 (black) to 940 (peak white) is used for Y′ and the range from 64 to 960 is used for Cb and Cr

Note 1 to entry: As per the narrow range definition from Rec. ITU-R BT.2100-1.

3.6

opto-electronic transfer function

OETF

function which converts a source input linear optical intensity into a non-linear video signal

Note 1 to entry: An example of input linear optical intensity is light input to a camera.

3.7

opto-optical transfer function

OOTF

function which has the role of applying the “rendering intent” on video signal

Note 1 to entry: In general, an OOTF is a concatenation of an OETF, artistic adjustments and an EOTF.

3.8

perceptual quantizer

PQ

one set of transfer functions achieving a very wide range of brightness levels for a given bit depth using a non-linear transfer function that is finely tuned to match the human visual system

Note 1 to entry: Sets of transfer functions related to HDR signals are specified in Rec. ITU-R BT.2100-1.

3.9

random access point access unit

RAPAU

access unit in the bitstream at which the initiation of the decoding process for some or all subsequent pictures in the bitstream is intended to be feasible

3.10

reference electro-optical transfer function

reference EOTF

specified EOTF for use under specific viewing environment, named the reference viewing environment

3.11

reference opto-electronic transfer function

reference OETF

specified OETF implemented within cameras, to ensure consistency of the image between cameras from different manufacturers

3.12

reference viewing environment

parameters to establish a reproducible viewing environment for critical viewing of material that can provide repeatable results from one facility to another when viewing the same material

Note 1 to entry: Rec. ITU-R BT.2100-1:2017, Table 3 provides reference viewing environment parameters for HDR programme material.