Image Decoding Tone Mapping Artistic Intent
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Solution Overview
Problem
Current HDR video distribution systems fail to accurately preserve artistic intent due to inadequate consideration of consumer display characteristics, particularly power consumption policies, which affect luminance and brightness rendering, leading to discrepancies between intended and actual display adaptations.
Innovation Solution
A method for decoding images that adjusts the image to the luminance characteristics of both the content and the presentation display, using an adapted display adaptation function, such as a tone mapping function, to ensure accurate artistic intent preservation by obtaining and matching luminance values from both the content and the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If display adaptation is performed using standard HDR distribution systems, then HDR content can be distributed to consumer devices, but artistic intent is not preserved due to inadequate consideration of display characteristics and power consumption policies
Solution Approach 1:
The patent implements dynamic adaptation by adjusting the tone mapping function parameters based on real-time detection of display characteristics and power consumption policies. The system continuously monitors display luminance capabilities and power constraints, then dynamically modifies the display adaptation parameters to optimize artistic intent preservation for each specific display condition, rather than using static adaptation parameters
Solution Approach 2:
The patent changes physical parameters of the display adaptation process by modifying tone mapping function parameters according to detected display characteristics and power consumption policies. The system adjusts luminance mapping parameters, contrast ratios, and brightness levels to match both the display's capabilities and its power constraints, thereby preserving artistic intent across diverse display environments
2Use of energy by moving object
If power consumption policies are enforced on consumer displays, then energy efficiency is improved, but luminance and brightness rendering accuracy deteriorates
Solution Approach 1:
The patent implements feedback mechanisms by detecting actual display characteristics and power consumption policies, then using this information to adjust the display adaptation parameters. The system receives feedback about the display's luminance capabilities and power constraints, and continuously refines the tone mapping function to maintain luminance rendering accuracy within the power consumption limits
Solution Approach 2:
The patent changes adaptation parameters dynamically based on power consumption levels. When power consumption constraints are detected, the system adjusts luminance mapping parameters, brightness levels, and contrast ratios to maintain acceptable rendering accuracy while operating within power limits, rather than using fixed high-accuracy parameters that would exceed power constraints
3Adaptability or versatility
If a single-layer coding solution is used for HDR distribution, then backward compatibility with SDR devices is achieved, but accurate display adaptation to consumer device characteristics cannot be performed
Solution Approach 1:
The patent implements a universal display adaptation mechanism that works across both SDR and HDR contexts. The same adaptation framework detects display characteristics and applies appropriate tone mapping functions regardless of whether the content is SDR or HDR, enabling accurate display adaptation while maintaining backward compatibility with legacy SDR devices and networks
Data Source
AI summary
A method for decoding an image enables to preserve artistic intent at the final rendering stage by adjusting the image to luminance characteristics of the content and of the presentation display that will display the image. Values representative of luminance of both the image and the display device are obtained. Parameters of a display adaptation function are adjusted according to these values and the adjusted display adaptation function is used to decode the image. In at least one embodiment, the adjusted display adaptation function relates to a tone mapping function. Corresponding apparatus implementing the method is also described.