Broadcast Signal Color Gamut Resampling for Legacy Compatibility
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Solution Overview
Problem
Current broadcast systems face challenges in perfectly expressing colors due to differences between the actual display environment and the manufacturing environment of UHD content, particularly with the transition to wider color gamuts like BT.2020, which are not yet supported by legacy image acquisition and display devices.
Innovation Solution
A method for transmitting and receiving broadcast signals that involves resampling content data from one color gamut to another, including generating and encoding signaling information for color gamut resampling, and using conversion equations or lookup tables to adapt the content to the display's color gamut, ensuring optimal display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If WCG (Wide Color Gamut) transmission format is used for UHD broadcasting, then color quality and realism are improved, but compatibility with legacy image acquisition and display devices is worsened
Solution Approach 1:
The patent changes the color gamut parameter from WCG (BT.2020) to legacy color gamut (REC.709) through resampling. The transmitter detects the receiver's display capabilities and adjusts the color gamut parameter accordingly, converting WCG content to legacy color gamut when the receiver cannot support WCG, thus maintaining color quality for capable devices while ensuring compatibility with legacy devices
Solution Approach 2:
The patent introduces dynamic color gamut adaptation where the color gamut is not fixed but changes based on the receiver's capabilities. The system dynamically selects between WCG and legacy color gamut modes, and the resampling process is controlled dynamically based on receiver feedback, allowing the broadcast system to adapt to different display environments in real-time
2Manufacturing precision
If color gamut resampling is performed to adapt content to display capabilities, then display degradation is reduced, but processing complexity increases
Solution Approach 1:
The patent introduces signaling information as an intermediary that facilitates communication between the transmitter and receiver about color gamut capabilities. This signaling mechanism enables the receiver to inform the transmitter about its display capabilities, allowing the transmitter to perform appropriate resampling without requiring complex real-time analysis of receiver hardware, thus reducing overall system complexity while maintaining display quality
Solution Approach 2:
The patent performs color gamut resampling in advance at the transmitter side based on预先 obtained receiver capability information through signaling. Rather than performing complex real-time resampling at the receiver, the system prepares the content in the appropriate color gamut before transmission, reducing the processing burden on the receiver and simplifying the overall system architecture
3Adaptability or versatility
If a single broadcast system supports multiple color gamuts, then service versatility is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal broadcast system that can handle both WCG and legacy color gamut content through a single transmission infrastructure. The system uses a unified signaling mechanism to communicate color gamut capabilities and performs resampling as needed, allowing one broadcast system to serve multiple types of receivers (WCG-capable and legacy) without requiring separate transmission systems, thus achieving multi-functionality while controlling complexity
Data Source
AI summary
The present invention relates to provision of a method and/or a device for transmitting and receiving a broadcast signal on the basis of color gamut resampling. The method for transmitting a broadcast signal, according to one embodiment of the present invention, comprises the steps of: resampling first color gamut-based content data into second color gamut-based content data; generating signaling information which includes color gamut resampling information indicating information on the resampling; respectively encoding the generated signaling information and the second color gamut-based content data; and transmitting the encoded content data and the encoded signaling information.