HDR Tone Mapping Parameter Filtering to Reduce Frame Flicker
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Solution Overview
Problem
Existing dynamic tone mapping methods for HDR video frames suffer from flickering issues due to rapid changes in image statistics between frames, and current solutions require complex memory storage and computation for tone mapping curve filtering.
Innovation Solution
A method for determining a parameter set for a tone mapping curve by temporally filtering metadata or curve parameters derived from HDR video frames, rather than the entire tone mapping curve, to reduce flickering and improve stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dynamic tone mapping is used to adapt to image statistics of each HDR video frame, then tone mapping quality is improved, but flickering occurs due to rapid changes in metadata between frames
Solution Approach 1:
The patent segments the tone mapping curve into discrete parameter sets that can be independently filtered. Instead of filtering the entire curve, only the parameter sets (metadata) are filtered, which reduces computational complexity while maintaining the ability to adapt to changing image statistics.
Solution Approach 2:
The patent applies preliminary temporal filtering to the parameter sets before generating the tone mapping curve for each frame. This preliminary action smooths out rapid changes in metadata between frames, preventing flickering while preserving the adaptive quality of dynamic tone mapping.
2Stability of the object's composition
If the entire tone mapping curve is temporally filtered to reduce flickering, then display stability is improved, but computation and memory requirements increase
Solution Approach 1:
The patent extracts only the essential parameter sets from the tone mapping curve for temporal filtering. By taking out only the metadata (parameter sets) rather than the entire curve, the system reduces memory storage requirements and computational complexity while still achieving flicker reduction.
Solution Approach 2:
The patent applies partial filtering by only processing the parameter sets (metadata) rather than the complete tone mapping curve. This partial action is sufficient to achieve flicker reduction without the excessive computational and memory costs of filtering the entire curve.
Data Source
AI summary
The present disclosure relates generally to the field of video processing, and more particularly, to high dynamic range (HDR) image processing. In particular, the present disclosure relates to a method for determining a parameter set for a tone mapping curve. The method comprises obtaining a plurality of parameter sets, wherein each parameter set defines the tone mapping curve, and wherein each parameter set is derived based on one of a plurality of HDR video frames. Further, the method comprises temporally filtering the plurality of parameter sets to obtain a temporally filtered parameter set.