MPD Structure for HDR Broadcast Signaling
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Solution Overview
Problem
To provide an HDR service in an MPEG DASH-based system, a new media presentation description (MPD) is needed, requiring signaling of a reference relationship between layers, matrix coefficient information for color conversion, and enabling legacy receivers to receive next-generation broadcast streams.
Innovation Solution
Defining an MPD for HDR services with a reference relationship between layers and new color conversion information, allowing legacy receivers to convert next-generation broadcast streams into legacy streams for compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a new MPD is defined for HDR service in DASH-based system, then HDR service quality is improved, but system complexity increases
Solution Approach 1:
The patent embeds color conversion information (matrix_coefficient, transfer_characteristic, primary_chromaticities) within the existing MPD structure by nesting them in adaptationSet or representation elements. This allows HDR service information to be integrated into the existing DASH framework without creating a completely separate signaling structure, thus improving HDR service quality while controlling system complexity through hierarchical nesting.
2Manufacturing precision
If color conversion information is defined in DASH MPD, then wide color gamut service is improved, but information signaling complexity increases
Solution Approach 1:
The patent applies local quality by defining color conversion information (matrix_coefficient, transfer_characteristic, primary_chromaticities) only where needed in the MPD structure - specifically in adaptationSet or representation elements that correspond to HDR content. This localized approach ensures precise color conversion for HDR content while avoiding unnecessary signaling overhead for SDR content, thus improving wide color gamut service without excessive information signaling complexity.
3Adaptability or versatility
If legacy receivers are enabled to receive next-generation broadcast stream, then system adaptability is improved, but conversion process complexity increases
Solution Approach 1:
The patent acts as an intermediary by embedding conversion parameters (matrix_coefficient, transfer_characteristic, primary_chromaticities) directly in the MPD structure. Legacy receivers can use these embedded parameters to perform color space conversion locally, transforming next-generation HDR broadcast streams into legacy-compatible formats. This intermediary approach improves receiver compatibility while keeping conversion process complexity manageable by providing all necessary conversion information in the standard MPD structure.
Data Source
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AI summary
The present invention proposes a method for transmitting a broadcast signal. The method for transmitting a broadcast signal according to the present invention proposes a system capable of supporting a next-generation broadcast service in an environment supporting next-generation hybrid broadcasting which uses a terrestrial broadcasting network and an Internet network. Also, in the environment supporting the next-generation hybrid broadcasting, the method proposes an efficient signaling scheme capable of covering both a terrestrial broadcasting network and an Internet network.