HDR Bitstream Metadata Segmentation for Mixed Playback Devices
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Solution Overview
Problem
Current HDR systems are primarily designed for high-end playback devices, leaving lower-end devices, such as those in mobile systems, unable to effectively process and display High Dynamic Range (HDR) content due to limited processing capabilities.
Innovation Solution
A method for encoding HDR content into an HDR bitstream that includes mapping HDR images to specified color volume base layers, generating primary and auxiliary metadata packets based on playback device capabilities, and combining these to create a bitstream that can be decoded and processed by a wide range of devices, from low to high performance, optimizing the base layer for reduced secondary mapping complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If HDR content is encoded for high-end playback devices, then image quality is improved, but device compatibility deteriorates
Solution Approach 1:
The patent segments the metadata into two distinct types: primary metadata that all playback devices can process, and auxiliary metadata that provides enhanced functionality for capable devices. This segmentation allows the same bitstream to serve both high-end and lower-end devices effectively, resolving the contradiction between image quality and device compatibility.
Solution Approach 2:
The patent applies local quality by providing different levels of processing detail in the metadata. High-capability devices can utilize the full auxiliary metadata for optimized local processing, while lower-capability devices can rely on the base primary metadata. This allows each device to operate at its appropriate quality level without requiring separate content versions.
2Adaptability or versatility
If HDR content is optimized for lower-end playback devices, then device compatibility is improved, but image quality deteriorates
Solution Approach 1:
The patent performs preliminary action by pre-calculating and embedding both primary and auxiliary metadata during the encoding stage. This allows playback devices to select the appropriate metadata level without requiring real-time computation, ensuring that lower-end devices receive pre-optimized instructions while high-end devices can access enhanced processing data for superior image quality.
3Ease of operation
If auxiliary metadata is generated for all playback devices, then processing complexity is reduced, but data transmission volume increases
Solution Approach 1:
The patent applies partial action by providing auxiliary metadata selectively rather than universally. Lower-end devices can ignore the auxiliary metadata and use only the compact primary metadata, while high-end devices that require the additional processing assistance can utilize the full auxiliary metadata set. This approach reduces the effective data volume for most devices while maintaining processing simplicity where needed.
Data Source
AI summary
A method for distributing High Dynamic Range (HDR) content to playback devices for displaying images where the HDR content is encoded to an HDR bitstream and the HDR bitstream is subsequently decoded by a playback device. The HDR bitstream contains auxiliary metadata packets that are based upon the processing capability of the playback device.