HDR Tone Mapping Curve Parameters from Two Anchor Points
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Solution Overview
Problem
Conventional tone mapping methods lack flexibility in choosing curve parameters and are difficult to implement, limiting the shape of the tone mapping curve, especially in high dynamic range (HDR) video processing.
Innovation Solution
A method for determining tone mapping curve parameters using a pair of anchor points, fine-tuning them, and generating curve parameters based on HDR video frames and metadata to create an adaptive tone mapping curve, allowing for improved flexibility and resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional tone mapping methods use multiple points or piecewise curves to determine the tone mapping curve, then the tone mapping can be performed, but the flexibility in choosing curve parameters is limited and the implementation becomes difficult
Solution Approach 1:
The patent changes the parameter representation from multiple point coordinates to just two anchor points that define the entire tone mapping curve. By parameterizing the curve through these two anchor points, the system achieves full flexibility in shaping the tone mapping curve while simplifying the implementation to only require determining these two key parameters instead of multiple fixed points.
Solution Approach 2:
The patent performs preliminary determination of the two anchor points based on scene characteristics and display capabilities before generating the complete tone mapping curve. This preliminary action of setting the anchor points allows the rest of the curve to be automatically derived, reducing implementation complexity while maintaining adaptability to different viewing conditions.
2Adaptability or versatility
If conventional methods use fixed tone mapping curves, then implementation is simple, but adaptability to different viewing conditions and content types is poor
Solution Approach 1:
The patent makes the tone mapping curve dynamic by allowing the two anchor points to be adjusted based on viewing conditions, content characteristics, and display capabilities. Instead of using a fixed curve, the system dynamically determines the anchor points to adapt the tone mapping behavior to different scenarios, achieving both adaptability and manageable complexity through this focused parameter approach.
Solution Approach 2:
The system changes parameters (the anchor point positions) based on input characteristics and viewing conditions to generate appropriate tone mapping curves. By only requiring two adjustable parameters instead of multiple fixed points, the system achieves high adaptability while keeping the parameter determination process simple and efficient.
Data Source
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 present 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.