Backwards-Compatible Digital Cinema Bitstream Encoding
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Solution Overview
Problem
Conventional digital cinema systems are limited by their low dynamic range and small color gamut, making it challenging to deliver high-quality digital cinema content that can be displayed on both standard and advanced systems without compromising quality.
Innovation Solution
A method and system for decoding digital cinema bitstreams that involve providing mapping parameters to expand or compress the dynamic range and color gamut of decoded images or videos, allowing for backwards-compatible delivery of content with extended range and larger color gamut, using inverse and forward mapping techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If digital cinema content is delivered with extended dynamic range and larger color gamut, then quality on advanced display systems is improved, but compatibility with conventional standard dynamic range systems deteriorates
Solution Approach 1:
The image signal is segmented into multiple layers: a base layer containing standard dynamic range content for conventional displays, and enhancement layers containing extended dynamic range and wider color gamut information for advanced displays. This segmentation allows the same content to be adaptively rendered on different display types without compromising either compatibility or quality.
Solution Approach 2:
The patent adds an extra dimension to the content delivery by incorporating metadata layers that describe the relationship between standard and extended range content. This metadata dimension enables receiving devices to intelligently select and process the appropriate content layer based on their capabilities, resolving the compatibility conflict.
2Manufacturing precision
If mapping parameters are used to expand dynamic range and color gamut, then visual quality on advanced systems is improved, but processing complexity increases
Solution Approach 1:
Mapping parameters are pre-calculated and embedded in the transmitted bitstream during content creation. This preliminary action eliminates the need for complex real-time parameter calculation at the receiving end, reducing processing complexity while maintaining the ability to deliver high-quality extended range content.
Solution Approach 2:
The patent introduces mapping parameters as an intermediary element that bridges standard dynamic range content and extended dynamic range display capabilities. These parameters act as a translation layer, enabling advanced displays to render standard content with enhanced quality without requiring complex real-time processing.
3Productivity
If a single bitstream is used for both standard and extended range content, then delivery efficiency is improved, but the ability to maintain visual equivalence across different display systems deteriorates
Solution Approach 1:
The patent implements a nested structure where standard dynamic range content is embedded within an extended dynamic range container, with enhancement layers nested within. This nested organization allows a single bitstream to efficiently deliver content suitable for both conventional and advanced displays while maintaining visual equivalence through selective layer processing.
Solution Approach 2:
The single bitstream is designed with multi-functionality, containing both base layer content for standard displays and enhancement layer content for advanced displays. This universal structure enables one bitstream to serve multiple display types effectively, maintaining visual equivalence across different systems through adaptive rendering.
Data Source
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AI summary
A digital cinema signal is encoded to produce a resulting coded digital cinema bitstream. Decoding the resulting coded digital cinema bitstream allows backwards-compatible delivery of digital cinema content. A digital image or video signal is preprocessed to produce two normalized digital image or video signals of differing quality levels and forward and inverse mapping parameters, which relate the normalized digital image or video signals. The preprocessing can be used prior to the encoding of a digital cinema signal to enable backwards-compatible delivery of digital cinema content.