Rational Function Opto-Electronic Transfer for HDR Video Accuracy
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Solution Overview
Problem
Existing HDR video coding technologies face challenges in accurately processing media data due to reliance on display device brightness and ambient light, leading to low accuracy and increased complexity, particularly with logarithmic operations in Hybrid Log Gamma (HLG) conversion functions.
Innovation Solution
The method involves determining an opto-electronic transfer control parameter based on the optical signal intensity of sampling points, using a rational function to perform opto-electronic transfer, and encoding this parameter into a bitstream to adaptively adjust conversion curves for different light intensity regions, thereby improving accuracy and reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HLG transfer function is used for HDR video coding, then backward compatibility with SDR devices is achieved, but processing complexity increases due to logarithmic operations
Solution Approach 1:
The patent changes the mathematical function type from logarithmic (HLG) to rational function, altering the transfer function parameters to achieve similar HDR-SDR compatibility without the computational complexity of logarithmic operations. The rational function uses simpler arithmetic operations while maintaining the essential tone mapping characteristics.
Solution Approach 2:
The patent substitutes the mathematical computation mechanism by replacing complex logarithmic calculations with simpler rational function calculations, reducing the computational burden while achieving the same functional goal of HDR to SDR tone mapping for backward compatibility.
2Manufacturing precision
If HLG transfer function is used for HDR video coding, then tone mapping is achieved, but accuracy decreases due to reliance on display device brightness and ambient light
Solution Approach 1:
The patent extracts and removes the dependency on environmental factors (display device brightness and ambient light) from the tone mapping process. By using a rational function that does not require these external parameters, the method achieves more consistent and accurate tone mapping independent of viewing conditions.
3Illumination intensity
If floating-point data is used for HDR storage, then brightness range is expanded, but storage space and bandwidth increase
Solution Approach 1:
The patent applies partial action by performing tone mapping only when necessary (during HDR to SDR conversion) rather than maintaining full HDR precision throughout the entire processing chain. This allows selective use of computational resources and data precision, reducing storage requirements while preserving HDR capabilities where needed.
Data Source
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AI summary
Provided in an embodiment of the present invention are a media data processing method, an apparatus and a system. The method comprises: obtaining an optical signal of a sampling point by a collection device at the source end in an acquisition of media data; according to an opto-electronic transfer control parameter, performing opto-electronic transfer for the optical signal of the sampling point to obtain a transferred electrical signal, wherein the opto-electronic transfer control parameter is determined on the basis of an optical signal intensity of the optical signal of the sampling point; and encoding the electrical signal and opto-electronic transfer control parameter to obtain a bitstream. According to the embodiment of the present invention, the problem of the lower accuracy in the media data processing is solved, thereby obtaining the effect of improving the accuracy in the media data processing.