Image Encoding With Luminance-Change Timing for HDR Displays
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Solution Overview
Problem
Existing image encoding technologies struggle to effectively handle the wide dynamic range of luminances and colors in HDR content, particularly in environments with varying display technologies and viewer preferences, leading to suboptimal rendering and viewer discomfort.
Innovation Solution
Incorporating additional data encoding that includes change time instants indicating characteristic luminance variations, allowing displays to process images more intelligently and adapt rendering strategies based on temporal and environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional data encoding with change time instants is implemented, then image rendering quality and adaptability are improved, but device complexity increases
Solution Approach 1:
The patent segments the image data into base image data and separate additional data streams. The additional data contains change time instants and luminance information that are encoded separately from the main image content, allowing for selective processing and reduced complexity in certain display scenarios.
Solution Approach 2:
The encoding process performs preliminary analysis of image data to identify characteristic luminance changes and timestamps these events. This preliminary action allows the display device to prepare appropriate rendering strategies in advance, improving adaptability without requiring complex real-time processing.
2Manufacturing precision
If dynamic range of luminances is expanded to capture HDR content, then image quality is improved, but compatibility with existing display technologies deteriorates
Solution Approach 1:
The patent applies different quality levels to different parts of the image data. The additional data stream contains high-precision luminance information for regions where dynamic range expansion is most beneficial, while maintaining compatibility with existing displays by providing optional enhancement rather than mandatory full HDR data.
Solution Approach 2:
The additional data encoding acts as an intermediary layer between HDR source content and existing display technologies. It provides bridge information that enables gradual transition and compatibility, allowing displays to process HDR content without requiring complete HDR capability.
3Measurement precision
If encoding precision for luminance values is increased, then rendering accuracy is improved, but data transmission requirements increase
Solution Approach 1:
The patent extracts only the most critical luminance information into the additional data stream - specifically change time instants and characteristic luminance values. This selective extraction maintains high precision for important luminance transitions while avoiding the need to transmit complete high-precision data for every pixel throughout the entire image sequence.
Data Source
AI summary
To allow better quality rendering of video on any display, a method is proposed of encoding, in addition to video data (VID), additional data (DD) comprising at least one change time instant (TMA_1) indicating a change in time of a characteristic luminance (CHRLUM) of the video data, which characteristic luminance summarizes the set of luminances of pixels in an image of the video data, the method comprising:generating on the basis of the video data (VID) descriptive data (DED) regarding the characteristic luminance variation of the video, the descriptive data comprising at least one change time instant (TMA_1), andencoding and outputting the descriptive data (DED) as additional data (DD).