UHD Broadcast Signal Color Accuracy via Display Metadata
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Solution Overview
Problem
Current broadcast systems face challenges in accurately expressing high-quality colors for Ultra High-Definition (UHD) content due to differences between the display environment of the user and the manufacturing environment, leading to suboptimal color representation on various receivers and display units.
Innovation Solution
An apparatus and method for transmitting and receiving UHD broadcast signals that includes a receiver, decoder, and controller, which utilize display information metadata to adjust the display environment of the receiver to match the intended display settings, ensuring accurate color reproduction by including metadata such as luminance, color gamut, and Electro Optical Transfer Function (EOTF) information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If content is transmitted without display environment metadata, then transmission complexity is reduced, but color accuracy deteriorates due to mismatch between manufacturing and display environments
Solution Approach 1:
The transmitting apparatus performs preliminary encoding of display environment metadata (including luminance, color gamut, and EOTF information) along with the UHD content before transmission. This preliminary preparation ensures that the receiving apparatus can reconstruct the intended display environment without requiring complex real-time adjustments, thus resolving the contradiction between transmission simplicity and color accuracy.
Solution Approach 2:
Display environment metadata acts as an intermediary between the content manufacturer's intended display environment and the user's actual display environment. The metadata includes luminance information, color gamut information, and EOTF information, which serve as bridging parameters to translate content encoded in one environment to another, thereby maintaining color accuracy while keeping the transmission system relatively simple.
2Manufacturing precision
If display environment is adjusted using metadata, then color accuracy is improved, but processing complexity increases
Solution Approach 1:
The receiving apparatus is designed with self-service capability to automatically adjust its display environment based on the received metadata. The apparatus autonomously performs decoding of the metadata, extraction of display parameters (luminance, color gamut, EOTF), and adjustment of its display settings without requiring manual intervention or complex external control systems, thus balancing color accuracy improvement with acceptable processing complexity.
Solution Approach 2:
The receiving apparatus adjusts display parameters (luminance level, color gamut range, EOTF curve) based on the metadata received from the transmitting apparatus. By changing these specific parameters to match the content's intended display environment, the system achieves accurate color reproduction while using standardized, well-defined adjustment mechanisms that keep processing complexity manageable.
3Manufacturing precision
If metadata including luminance, color gamut, and EOTF information is transmitted, then color reproduction quality is improved, but data transmission volume increases
Solution Approach 1:
The display environment metadata is extracted and transmitted as separate, essential information from the main UHD content stream. The metadata contains only the critical parameters needed for display environment adjustment (luminance, color gamut, EOTF), excluding redundant data. This selective extraction approach ensures high color reproduction quality while minimizing the additional data transmission volume.
Solution Approach 2:
The system transmits a partial set of display parameters (only luminance, color gamut, and EOTF information) rather than complete display environment specifications. This partial transmission approach provides sufficient information for accurate color reproduction without transmitting excessive data, thus balancing color reproduction quality with data transmission efficiency.
Data Source
AI summary
The present invention relates to a method and an apparatus for transmitting and receiving an ultra high-definition broadcasting signal for expressing high-quality color in a digital broadcasting system. An apparatus for receiving an ultra high-definition broadcasting signal according to one embodiment of the present invention comprises: a receiving unit for receiving an ultra high-definition broadcasting signal which includes ultra high-definition broadcasting contents and display information metadata representing display environment information suitable for the ultra high-definition broadcasting contents; a decoder for decoding the received ultra high-definition broadcasting contents and the display information metadata; a controlling unit for adjusting the display environment of the receiving apparatus to a display environment suitable for the ultra high-definition broadcasting contents using the display information metadata; and a reproducing unit for reproducing the ultra high-definition broadcasting contents.