Playback Device HDR to SDR Luminance Conversion
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Solution Overview
Problem
Conventional image signal processing devices struggle to effectively display High Dynamic Range (HDR) signals on Standard Dynamic Range (SDR) compatible displays, leading to suboptimal image quality and difficulty in visual recognition of graphics videos due to limitations in luminance range conversion.
Innovation Solution
A method and device that determine the presence of a luminance range conversion function in a playback device, converting HDR signals to SDR signals when necessary, and using a color conversion table to generate pseudo-HDR signals for SDR displays, ensuring appropriate operation based on the device's capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HDR signals are displayed on SDR compatible displays without conversion, then the display can show content in its original format, but the image quality deteriorates and visual recognition of graphics videos becomes difficult due to luminance range mismatch
Solution Approach 1:
The patent applies parameter changes by converting the luminance range of graphics videos from HDR (0-1000 nits) to SDR (0-100 nits) to match the display capabilities of SDR compatible displays. This transformation resolves the contradiction by adjusting the luminance parameter to ensure both image quality and display compatibility.
Solution Approach 2:
The patent introduces an intermediary conversion process that acts as a mediator between HDR content and SDR displays. The conversion unit transforms HDR graphics videos into SDR-compatible formats, enabling seamless display on SDR devices while maintaining visual recognition quality that would otherwise be lost due to luminance range mismatch.
2Ease of operation
If HDR graphics videos are converted to SDR luminance range, then visual recognition is improved on SDR displays, but the processing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing HDR to SDR conversion in advance during the playback process, before the graphics video is displayed on the SDR compatible display. This pre-conversion approach simplifies the overall processing by eliminating the need for real-time conversion during display, thereby reducing processing complexity while ensuring visual recognition quality.
3Adaptability or versatility
If the playback device always converts HDR to SDR, then compatibility with SDR displays is ensured, but the adaptability to HDR-capable displays is reduced
Solution Approach 1:
The patent applies dynamics by making the conversion process conditional rather than static. The playback device dynamically determines whether to convert HDR graphics videos to SDR based on the detected display type. When an SDR compatible display is detected, conversion is performed to ensure compatibility; when an HDR-capable display is detected, the original HDR signal is preserved to maintain image quality. This dynamic adaptation resolves the contradiction between compatibility and image quality.
Data Source
AI summary
A method to be performed by a playback device includes determining whether the playback device has a function for converting first graphics in a second luminance range narrower than a first luminance range to second graphics in the first luminance range, when the playback device has the function, converting the first graphics to the second graphics, and displaying a video in the first luminance range with the second graphics being superimposed on the video, and when the playback device does not have the function, displaying the video with third graphics different from the second graphics being superimposed on the video.