Overview
ISO/IEC 21794-2:2021/Amd 1:2021 is an amendment to the international standard defining the JPEG Pleno light field coding system for plenoptic image coding. This document specifies the introduction of profiles and levels for the JPEG Pleno light field coding system, enhancing interoperability and implementation clarity. The amendment targets efficient coding of complex light fields using either block-based or view-based coding modes, supporting high-quality, immersive imaging applications.
Issued by ISO and IEC, this standard amendment formalizes the structure for profile and level signaling, enabling standardized decoding and encoding of light field data. It applies to the plenoptic image coding domain within information technology and multimedia content compression.
Key Topics
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Profiles definition
Two core profiles are introduced for JPEG Pleno light field coding:
- Baseline block-based profile: Uses 4D transform mode coding tools for compression.
- Baseline view-based profile: Utilizes 4D prediction mode coding tools.
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Levels specification
Levels define constraints based on the maximum number of samples and block dimensions to accommodate different light field resolutions and complexities.
- Levels specify limits such as maximum samples and maximum block size for encoding.
- The maximum bit precision for light field samples in both profiles is set at 16 bits.
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Profile and Level box signaling
Encoding includes a jppl box type to signal the profile and level of the codestream, ensuring consistent interpretation across different decoders and devices.
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Relationship to existing standards
The Baseline view-based profile leverages ITU-T Rec. T.800 | ISO/IEC 15444-1 for coding reference and residual views, ensuring compatibility with JPEG 2000-based technologies.
Applications
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Light Field Imaging and Rendering
Supports capture, compression, and streaming of complex light field data for applications such as 3D imaging, holography, and free-viewpoint video.
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Virtual and Augmented Reality
Enables efficient coding for immersive content requiring multi-view and multi-directional light field information.
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Advanced Photography and Cinematography
Facilitates plenoptic camera data compression, preserving depth and directional light details for post-processing and depth refocusing.
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Multimedia Streaming and Broadcasting
Optimizes bitrates and bandwidth in transmitting light field content over networks with standardized profiles and levels.
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Visualization and Scientific Imaging
Caters to applications needing precise light field data handling, such as medical imaging or computational imaging systems.
Related Standards
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ISO/IEC 21794 series (JPEG Pleno):
The broader series covering plenoptic image coding, including point cloud and holographic coding technologies.
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ISO/IEC 15444-1 (JPEG 2000):
Referenced for view-based coding tools in the baseline view-based profile.
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ITU-T Recommendation T.800:
Provides technical basis for image compression used in JPEG 2000, utilized in decoding elements of the light field data.
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ISO/IEC Directives Part 1 & 2:
Govern the development process and editorial rules for international standards applicable to this amendment.
This amendment strengthens the JPEG Pleno light field coding system framework by defining clear profiles and levels, fostering broad adoption in high-fidelity light field compression and processing. Its design supports scalable implementation across diverse multimedia and imaging technologies, crucial for advancing immersive visual experiences.