Playback Device Color Gamut Conversion for UHD Display Compatibility
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Solution Overview
Problem
Current technologies fail to accurately transfer information about the color gamut and dynamic range of ultra-high definition (UHD) content from Blu-ray discs to display devices, leading to potential misrepresentation of the intended color and brightness.
Innovation Solution
A reproduction device that reads and decodes video streams from Blu-ray discs, including monitor information about the color gamut and dynamic range, and adjusts the output based on the display device's capabilities, using conversion units to ensure compatible video data is sent, whether the display device can process the original gamut and range or not.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If monitor information about wide color gamut and high dynamic range is transferred to a display device, then the color and brightness accuracy is improved, but compatibility with older display devices is worsened
Solution Approach 1:
The patent changes the parameters of video data by converting color gamut (e.g., from BT.2020 to BT.709) and dynamic range (e.g., from HDR to SDR) based on the display device's capabilities. The reproduction device reads monitor information indicating the original color gamut and dynamic range, compares it with the display device's supported parameters, and performs appropriate conversion to ensure accurate reproduction while maintaining compatibility across different display devices.
Solution Approach 2:
The reproduction device acts as an intermediary between the recording medium (Blu-ray disc) and the display device. It reads monitor information from the disc, determines the display device's capabilities through handshake communication, and mediates the video data transmission by performing necessary color gamut and dynamic range conversions before outputting to the display device.
2Adaptability or versatility
If video data is converted to match display device capabilities, then compatibility is improved, but the original color and brightness information may be lost
Solution Approach 1:
The reproduction device performs preliminary conversion of video data parameters before transmission to the display device. By converting color gamut and dynamic range in advance based on the display device's capabilities, it ensures compatibility while preserving as much of the original information as possible through optimized conversion algorithms that maintain visual quality.
Solution Approach 2:
The patent applies parameter changes by converting video data from wide color gamut (BT.2020) to standard color gamut (BT.709) and from high dynamic range (HDR) to standard dynamic range (SDR) when the display device cannot support the original parameters. This ensures compatibility while minimizing information loss through careful conversion processes.
3Measurement precision
If monitor information is always transferred to the display device, then color and brightness accuracy is improved, but the system complexity increases
Solution Approach 1:
The system dynamically adjusts whether to transfer monitor information based on the display device's capabilities. Through handshake communication, the reproduction device determines if the display device supports wide color gamut and high dynamic range, and only transfers monitor information when the display device is capable of processing it, thereby maintaining accuracy while avoiding unnecessary complexity.
Solution Approach 2:
The reproduction device is designed with multi-functionality to handle both wide color gamut/high dynamic range content and standard content. It can read and process monitor information, perform conversions when needed, and transfer appropriate information to the display device, making the system universally compatible while maintaining high accuracy when conditions permit.
Data Source
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AI summary
The present technology relates to a reproduction device, a reproduction method, and a program which are capable of transferring information about a color gamut and a dynamic range of luminance of a content recorded in a recording medium to a display device. A reproduction device of the present technology includes: a readout unit configured to read out, from a recording medium recording a content, a file of a video stream and a file of reproduction management information used for reproducing the video stream and including monitor information indicating at least one of a color gamut and a dynamic range of luminance of a master monitor used for authoring the video stream; a decoding unit configured to decode the video stream; and an output unit configured to control an output of video data obtained by decoding the video stream and the monitor information included in the reproduction management information to a display device, depending on a performance of the display device to which the content is output. The present technology can be applied to a player that reproduces a content.