Dynamic EOTF Application for Mixed HDR SDR Picture-in-Picture
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Solution Overview
Problem
Conventional display devices cannot provide an optimal user experience when applying identical image settings to different dynamic range image sources in picture-in-picture (PiP) mode, leading to abnormal standard dynamic range (SDR) images when high dynamic range (HDR) and SDR images are mixed.
Innovation Solution
A method and device that dynamically apply different electro-optical transfer functions (EOTFs) to multiple image sources based on metadata, such as Maximum Content Light Level, Maximum Frame Average Light Level, and Minimum Content Light Level, using a scaler to detect and process HDR and SDR images separately with dynamic tone mapping and temporal filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If identical image settings are applied to all PiP images, then the device complexity is reduced and ease of operation is improved, but the image quality and reliability deteriorate when mixing HDR and SDR sources
Solution Approach 1:
The patent applies different electro-optical transfer functions (EOTFs) to different picture regions based on their source type (HDR or SDR). The processor identifies each picture source and applies the appropriate EOTF locally, ensuring that HDR pictures use HDR-specific transfer functions while SDR pictures use standard transfer functions, thereby maintaining image quality without requiring complex user configuration.
2Reliability
If different EOTFs are applied to different image sources, then the image quality and reliability are improved, but the device complexity increases
Solution Approach 1:
The system automatically detects the type of each picture source (HDR or SDR) through metadata analysis and autonomously applies the appropriate EOTF without requiring user intervention. The processor self-manages the complexity by identifying source characteristics and selecting processing parameters automatically, thereby improving reliability while keeping the user interface simple.
Solution Approach 2:
The patent performs preliminary detection of picture source types and pre-determines the appropriate EOTFs before actual image processing. By analyzing metadata and source characteristics in advance, the system prepares the correct processing parameters, which simplifies the subsequent processing steps and reduces runtime complexity.
3Adaptability or versatility
If HDR settings are applied to SDR images, then the processing capability is improved, but abnormal image generation occurs
Solution Approach 1:
The patent applies different electro-optical transfer functions (EOTFs) to different picture regions based on their source type (HDR or SDR). The processor identifies each picture source and applies the appropriate EOTF locally, ensuring that HDR pictures use HDR-specific transfer functions while SDR pictures use standard transfer functions, thereby maintaining image quality without requiring complex user configuration.
Data Source
AI summary
A processing method for a plurality of image sources, for a display device includes inputting a plurality of image sources; detecting the plurality of image sources according to metadata of the a plurality of image sources to determine electro-optical transfer function (EOTF) corresponding to the a plurality of image sources; and dynamically applying different EOTFs on corresponding image sources.