Modified EOTF Curve for SDR Content Encoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing encoders for Standard Dynamic Range (SDR) content are inefficient as they treat all image values equally, leading to wasted bits in high brightness regions where human perception cannot distinguish differences, and they do not account for human perception differences in lower versus higher brightness ranges.
Innovation Solution
A system that converts SDR content using a modified Electro-Optical Transfer Function (EOTF) curve, specifically constrained to the 100 nits needed for SDR content, allowing encoding at 8-bit precision without banding, and providing a more efficient mapping of digital code values to luminance ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If encoders treat all image values equally using conventional EOTF curves, then the encoding process is simple and fast, but bits are wasted in high brightness regions where human perception cannot distinguish differences
Solution Approach 1:
The patent applies parameter changes by modifying the EOTF curve parameters to match human perception characteristics. Specifically, it uses a modified EOTF curve that applies different compression ratios to different brightness regions, with higher compression in mid-to-high brightness regions where human eyes are less sensitive to changes. This resolves the contradiction by optimizing bit allocation according to perceptual importance rather than treating all values equally.
Solution Approach 2:
The patent implements local quality by applying different encoding characteristics to different regions of the image brightness spectrum. The modified EOTF curve applies higher compression to mid-to-high brightness regions (where human perception is less sensitive) and lower compression to low brightness regions (where human perception is more sensitive). This local differentiation ensures bits are not wasted in regions where they provide no perceptual benefit.
2Adaptability or versatility
If conventional EOTF curves are used for SDR content, then compatibility with existing systems is maintained, but image quality deteriorates due to banding artifacts and poor perception alignment
Solution Approach 1:
The patent modifies EOTF curve parameters to create a customized transfer function that aligns with human perception while maintaining SDR compatibility. The modified curve uses specific compression ratios for different brightness ranges, ensuring that the output remains compatible with conventional SDR displays while achieving superior image quality through perceptually-optimized bit distribution.
Solution Approach 2:
The patent introduces dynamic adaptation by making the EOTF curve responsive to the specific characteristics of SDR content. The modified curve dynamically adjusts the compression characteristics based on the brightness region being encoded, allowing the system to adapt to human perception patterns in real-time during the encoding process while maintaining compatibility with existing SDR infrastructure.
3Quantity of substance
If 8-bit encoding is used for SDR content, then bandwidth requirements are reduced, but banding artifacts appear in mid-to-high brightness regions
Solution Approach 1:
The patent changes the EOTF curve parameters to optimize the mapping between 8-bit digital values and luminance ranges. By adjusting the compression ratios in the modified EOTF curve, it ensures that 8-bit encoding provides sufficient precision across all brightness regions, preventing banding artifacts while maintaining acceptable bandwidth requirements for SDR content distribution.
Data Source
AI summary
The present disclosure relates to systems and methods for transmitting Standard Dynamic Range (SDR) content. The systems and methods may use a modified Electro-Optical Transfer Function (EOTF) curve to convert nonlinear color values of SDR content into optical output values of modified SDR content. The systems and methods may encode the modified SDR content using eight bits while preventing banding. The systems and methods may transmit the encoded data to a client device for presentation on a display.