HDR Tone Mapping Parameter Selection Using Adaptive Anchor Points
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Solution Overview
Problem
Conventional tone mapping methods lack flexibility in choosing curve parameters for HDR video processing, limiting the adaptability and quality of tone mapping curves.
Innovation Solution
A method for determining tone mapping curve parameters using anchor points, allowing for adaptive tone mapping curves based on HDR video frames and metadata, with the ability to fine-tune anchor points for optimal local contrast and perceptual quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional tone mapping methods use fixed curves (linear, parabola, linear) for different luminance areas, then the processing is simple and deterministic, but the flexibility in choosing curve parameters is limited and the adaptability to different HDR content is reduced
Solution Approach 1:
The patent transforms the static, fixed curve approach into a dynamic system where anchor points can be freely positioned and curve parameters are adaptively determined based on HDR content characteristics. The tone mapping curve becomes flexible and可调 (adjustable) rather than rigid, allowing optimization for different luminance ranges and content types while maintaining systematic parameter control through the anchor point mechanism.
Solution Approach 2:
The patent enables free selection of curve parameters by introducing anchor points that define key positions on the tone mapping curve. Instead of being constrained to fixed curve shapes, users can modify parameters such as anchor point positions, luminance values, and curve segments to adapt the tone mapping behavior to different HDR content requirements, achieving versatility without overwhelming complexity.
2Ease of operation
If conventional methods use multiple fixed curves for different luminance ranges, then the processing workflow is straightforward, but it is difficult to choose optimal curve parameters for specific content requirements
Solution Approach 1:
The patent provides default anchor point configurations and recommended parameter settings that work well for general HDR content. Users can start with these pre-configured settings for straightforward processing, then selectively adjust specific anchor points or curve segments when customization is needed, achieving ease of operation for common cases while maintaining flexibility for specialized requirements.
Data Source
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AI summary
The present disclosure relates generally to the field of video processing, and more particularly to high dynamic range (HDR) video and image processing. In particular, the disclosure relates to determining one or more curve parameters of a tone mapping curve. For example, a device (encoder or decoder) may obtain a high dynamic range (HDR) video frame and metadata associated to the HDR video frame. The device further obtains a pair of anchor points, based on the HDR video frame and the metadata. The pair of anchor points comprises a first anchor point and a second anchor point of the tone mapping curve. Moreover, the device generates the one or more curve parameters of the tone mapping curve based on the pair of anchor points.