ISO/IEC 18181-1:2022

Name: ISO/IEC 18181-1:2022 — Information technology — JPEG XL image coding system — Part 1: Core coding system
SKU: ISO/IEC 18181-1:2022
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Information technology — JPEG XL image coding system — Part 1: Core coding system

Название (английский):

Information technology — JPEG XL image coding system — Part 1: Core coding system

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 101
Дата публикации:: 30 марта 2022 г.
Издание:: ISO/IEC IS 18181 edition 1 version 1
ICS:: 35.040.30

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Описание (английский):

This document defines a set of compression methods for coding one or more images of bi-level, continuous-tone greyscale, or continuous-tone colour, or multichannel digital samples. This document: — specifies decoding processes for converting compressed image data to reconstructed image data; — specifies a codestream syntax containing information for interpreting the compressed image data; — provides guidance on encoding processes for converting source image data to compressed image data.

Abstract

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Overview

ISO/IEC 18181-1:2022 - part 1 of the JPEG XL image coding system - defines the core coding system for compressing and representing bi-level, continuous‑tone greyscale, colour, and multichannel digital images. The standard specifies the codestream syntax, decoding processes to reconstruct image data from compressed forms, and provides guidance for encoding processes that convert source images into the codestream. It is the normative foundation for implementing JPEG XL decoders and interoperable encoders.

Key Topics

Codestream and bitstream syntax: structured fields and bundles used to represent compressed image data, including field types like u(n), U32, U64, Varint, and F16.

Decoding processes: step‑by‑step requirements for converting compressed data to reconstructed frames, including support for multiple frames, previews, bursts and animations.

Encoder and decoder requirements: minimum functional requirements and conventions that ensure interoperability.

Entropy decoding and predictors: normative components for entropy coding and weighted prediction (see Annexes).

Transforms and filters: integral transforms (DCT and related), restoration filters, and adaptive quantization methods described in normative annexes.

Colour handling and profiles: ICC profile integration and colour transforms (including opsin/XYB references) for accurate colour management.

Image features and extensions: support for multichannel images, chroma-from-luma methods, and extension mechanisms for future features.

Practical building blocks: headers, frames, histograms, group splitting, mirroring and other structural elements used by implementations.

Applications

ISO/IEC 18181-1:2022 is applicable wherever efficient, high‑quality image compression and flexible feature support are required:

Web and mobile imaging - reduced file sizes with broad colour and HDR support for faster delivery.

Photography and digital imaging workflows - archival and interchange of high‑fidelity images.

Broadcasting and cinema - compatibility with HDR (Rec. ITU‑R BT.2100) and standard colour spaces.

Imaging software and codecs - reference for implementing interoperable encoders/decoders, preview generation, and multiframe formats (bursts/animations).

Device manufacturers - camera firmware and image pipelines that need compact multichannel representation.

Related standards

ISO 15076‑1:2010 (ICC profile format)

Rec. ITU‑R BT.2100 (HDR parameter values)

Rec. ITU‑R BT.709 and SMPTE ST 428‑1 (colour/imaging guidelines)

IEC 60559 (floating‑point arithmetic references)

Note: The standard may involve patented technologies; consult ISO/IEC patent declarations for licensing information.

ISO/IEC 18181-1:2022

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Who should use this standard

Related standards

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