HDR Tone Mapping Curve Parameters for Flicker-Stable Video
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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 applies temporal filtering to metadata parameters before they are used in tone mapping, anticipating potential flicker issues by pre-processing the data. This preliminary action smooths out rapid changes in image statistics between frames, allowing dynamic adaptation while maintaining display stability.
Solution Approach 2:
The patent introduces temporal filtering as a cushioning mechanism that dampens rapid fluctuations in metadata parameters. This beforehand cushioning prevents flickering by smoothing transitions between frames, ensuring stable display while preserving the benefits of dynamic tone mapping.
2Stability of the object's composition
If temporal filtering is applied to the entire tone mapping curve, then flickering is reduced, but computation complexity and memory requirements increase
Solution Approach 1:
The patent segments the tone mapping process by applying temporal filtering only to critical metadata parameters (such as average brightness, contrast, or specific curve points) rather than the entire tone mapping curve. This segmentation reduces computation complexity and memory requirements while still effectively preventing flickering in the displayed output.
Solution Approach 2:
The patent applies temporal filtering selectively to specific parameters or regions of the tone mapping curve that have the greatest impact on visual flicker. This local quality approach optimizes the balance between flicker reduction and computational efficiency by focusing resources on the most critical areas.
3Stability of the object's composition
If temporal filtering is applied to the entire tone mapping curve, then flickering is reduced, but memory storage requirements increase
Solution Approach 1:
The patent segments the tone mapping data structure, storing and filtering only the essential metadata parameters that define the curve characteristics. By segmenting the data to include only critical parameters (such as a few key control points or statistical descriptors) rather than the complete curve, memory storage requirements are significantly reduced while maintaining flicker reduction effectiveness.
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.