HDR Video Brightness Conversion for Standard Monitor Playback
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Solution Overview
Problem
Content with a wide dynamic range of brightness, such as HDR videos, cannot be accurately displayed on monitors with standard brightness due to compression during authoring, leading to a deterioration in dynamic range.
Innovation Solution
A reproduction device and method that includes a readout, decoding, and conversion unit to process coded data from a recording medium, utilizing brightness characteristic and conversion information to adjust video brightness for appropriate display on both HDR and STD monitors, with the coded data being HEVC compliant and incorporating SEI for tone mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the dynamic range of master video is compressed to fit standard brightness monitors, then compatibility with standard monitors is improved, but the dynamic range of the video is deteriorated
Solution Approach 1:
The patent segments the video content into multiple versions: an extended dynamic range version (HDR) and a standard dynamic range version (SDR). The reproduction device selectively outputs different versions based on display device capabilities, thereby maintaining both high dynamic range quality and broad compatibility without compromising either.
Solution Approach 2:
The system dynamically adjusts the output video format based on the detected capabilities of the display device. The reproduction device determines whether to output extended dynamic range video or standard dynamic range video in real-time, allowing the system to adapt its behavior to match the specific requirements of each display device.
2Adaptability or versatility
If content is authored for standard brightness monitors, then compatibility is improved, but the ability to utilize HDR monitor performance is lost
Solution Approach 1:
The patent prepares both extended dynamic range and standard dynamic range video versions during the authoring process. By pre-processing the content into multiple formats and storing them separately, the system ensures that both HDR and SDR versions are readily available for output, eliminating the need for real-time conversion and ensuring optimal quality for each display type.
Solution Approach 2:
The system changes the brightness parameter range based on the display device capabilities. When an HDR-capable device is detected, the system outputs video with extended brightness parameters (higher peak luminance, wider dynamic range). When a standard device is detected, it outputs video with conventional brightness parameters, thereby optimizing the brightness range utilization for each specific display type.
3Adaptability or versatility
If brightness conversion is performed to adapt to different monitors, then display compatibility is improved, but image quality may be compromised
Solution Approach 1:
The patent creates separate copies of the video content in different dynamic range formats (HDR and SDR). Instead of converting one format to another, which can introduce quality loss, the system maintains faithful copies of the original content in both formats and selects the appropriate copy for output based on the display device capabilities.
Data Source
AI summary
The present technology relates to a reproduction device, a reproduction method, and a recording medium that enable content having a wide dynamic range of brightness to be displayed with an appropriate brightness. A recording medium, on which the reproduction device of one aspect of the present technology performs reproduction, records coded data of an extended video that is a video having a second brightness range that is wider than a first brightness range, brightness characteristic information that represents a brightness characteristic of the extended video, and brightness conversion definition information used when performing a brightness conversion of the extended video to a standard video that is a video having the first brightness range. The reproduction device decodes the coded data and converts the extended video obtained by decoding the coded data to the standard video on the basis of the brightness conversion definition information.