Adaptive Luminance Profile for HDR Video Playback Speed
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Solution Overview
Problem
High dynamic range (HDR) displays often cause visual discomfort due to rapid luminance variations that exceed the adaptation speed of the human visual system, leading to degradation of the viewing experience when playback speed is modified, such as during fast-forward or rewind.
Innovation Solution
A method and system that detect user-initiated changes in video playback speed and adjust the luminance profile of the display in real-time to match the viewer's adaptation speed, ensuring that luminance variations remain within comfortable perception ranges by modifying the electro-optical transfer function and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If HDR display with high peak luminance is used, then the dynamic range and brightness capability are improved, but visual discomfort occurs due to rapid luminance variations exceeding HVS adaptation speed
Solution Approach 1:
The patent applies dynamics by making the luminance profile adaptive and changeable in real-time based on playback speed. The system dynamically adjusts the electro-optical transfer function (EOTF) to modify luminance output characteristics, allowing the display to transition between different luminance profiles (e.g., from HDR to SDR-like behavior) depending on the current playback speed condition, thus resolving the contradiction between high peak luminance capability and visual comfort during rapid transitions
Solution Approach 2:
The patent changes the luminance profile parameter based on playback speed detection. When fast-forward or rewind is detected, the system modifies the EOTF parameters to reduce peak luminance or smooth luminance transitions, effectively changing the display's luminance characteristics to match the reduced temporal resolution perceived by the viewer, thereby preventing visual discomfort while maintaining HDR capabilities during normal playback
2Object-affected harmful factors
If luminance profile is adjusted to prevent visual discomfort, then viewing comfort is improved, but power consumption increases due to reduced luminance efficiency
Solution Approach 1:
The system dynamically switches between different luminance profiles based on playback speed, maintaining efficient HDR luminance output during normal playback while transitioning to comfort-optimized profiles only when needed. This dynamic approach ensures that power consumption is increased only temporarily and selectively during speed-modified playback, rather than continuously, thus minimizing the energy trade-off
Solution Approach 2:
The system detects playback speed changes and proactively adjusts the luminance profile before visual discomfort can occur. By anticipating the need for luminance adjustment based on detected speed modifications, the system applies comfort-oriented luminance reduction only for the necessary duration, optimizing the balance between visual comfort and power consumption
3Productivity
If playback speed is increased for fast-forward, then productivity is improved, but luminance variations exceed HVS adaptation speed causing degradation of viewing experience
Solution Approach 1:
The patent changes the luminance profile parameter based on playback speed detection. When fast-forward or rewind is detected, the system modifies the EOTF parameters to reduce peak luminance or smooth luminance transitions, effectively changing the display's luminance characteristics to match the reduced temporal resolution perceived by the viewer, thereby preventing visual discomfort while maintaining HDR capabilities during normal playback
Solution Approach 2:
The system uses feedback from playback speed detection to continuously adjust luminance output characteristics. By monitoring the current playback speed and responding with appropriate luminance profile selections, the system ensures that luminance variations remain appropriate for the current playback condition, maintaining viewing experience quality even during accelerated playback
Data Source
AI summary
A method of displaying images on a display. Images from a video playback are displayed on the display with a first luminance profile, the luminance profile mapping video data samples to output luminance of the display. A user initiated modification of a speed of the video playback is detected. A second luminance profile is determined for the display of the video playback, the second luminance profile being determined according to the modified speed of the video playback and a predetermined adaptation speed of a human visual system of a viewer of the video playback. Further images from the video playback are displayed on the display using the determined second luminance profile.