Gamut Conversion Metadata for Wide Color Range Broadcasting
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Solution Overview
Problem
The challenge lies in reproducing content with wide color gamut on displays with low color gamut capabilities, as existing technologies lack efficient methods for converting wide color gamut content into formats compatible with displays that support only narrow color gamut.
Innovation Solution
A method involving the encoding and transmission of video data with metadata that includes original and target gamut information, along with weighting functions and region-specific conversion details, to enable effective gamut conversion and signaling for UHD services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wide color gamut content is transmitted and displayed as-is, then color quality and wide gamut fidelity are improved, but compatibility with low gamut displays deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting color gamut parameters based on display capabilities. The system transforms wide gamut content (BT.2020) into narrow gamut formats (REC.709) by modifying color space parameters, including converting color coordinates and adjusting chroma subsampling ratios, to ensure optimal display quality across different device capabilities
Solution Approach 2:
The patent implements dynamics through adaptive gamut conversion that responds to real-time display capability detection. The system dynamically selects conversion parameters and processing methods based on the target display's color gamut characteristics, making the transmission system flexible and adaptable to various display devices
2Adaptability or versatility
If gamut conversion processing is applied to ensure compatibility, then display compatibility is improved, but color quality and gamut fidelity deteriorate
Solution Approach 1:
The patent applies local quality by implementing region-specific conversion strategies within the color space. Different conversion methods are applied to different regions of the color gamut based on their importance and the display's capabilities, preserving critical color information while adapting to display constraints
Solution Approach 2:
The patent implements preliminary action by pre-processing content with multiple conversion paths before transmission. The system prepares converted versions of the content in advance with embedded metadata, allowing the receiving device to select the appropriate version without real-time processing, thus maintaining quality while ensuring compatibility
3Manufacturing precision
If detailed gamut conversion metadata is transmitted, then conversion precision is improved, but data transmission volume and system complexity increase
Solution Approach 1:
The patent applies taking out by extracting only the essential gamut conversion parameters needed for accurate conversion. The system identifies and transmits only the critical metadata elements (color space identifiers, conversion matrices, region boundaries) while omitting redundant information, reducing signaling overhead while maintaining conversion precision
Data Source
AI summary
The present invention provides a method and an apparatus for transmitting and receiving a broadcast signal so as to adjust a colour range of content. The method for transmitting a broadcast signal according to an embodiment of the present invention comprises the steps of: encoding video data and signalling information including metadata with respect to the gamut of the video data; generating a broadcast signal including the encoded video data and signalling information; and transmitting the generated broadcast signal.