HDMI Video Processing Using RDM for Low-Latency HDR Transmission
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Solution Overview
Problem
Existing HDMI systems face challenges in performing image processing for video data, especially when the source device fails to receive necessary information from the sink device, particularly for HDR and SDR video data with different characteristics, and for gaming content.
Innovation Solution
The method involves a source device using a reference display model (RDM) to perform image processing on video data based on capability information received from the sink device, even if such information is unavailable, and transmitting processed video data along with image processing details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the source device waits to receive image processing information from the sink device before processing video data, then the image processing can be accurately adapted to the display characteristics, but the transmission efficiency is reduced and latency increases
Solution Approach 1:
The source device performs image processing on video data before receiving detailed image processing information from the sink device. It uses preliminary capability information (such as HDR/SDR support, color space support) to conduct preliminary image processing, thereby reducing transmission latency while maintaining acceptable image quality. The processed video data and preliminary image processing information are transmitted to the sink device, which then performs further image processing based on its actual display characteristics.
2Productivity
If the source device performs image processing based on default assumptions when capability information is unavailable, then transmission can proceed without delay, but image processing quality may be suboptimal
Solution Approach 1:
The source device performs partial image processing based on available capability information and default assumptions, rather than waiting for complete information. It processes video data using default parameters for missing capability information, enabling transmission to proceed without delay. The sink device then performs additional image processing to refine the quality based on its actual characteristics.
Solution Approach 2:
The source device introduces preliminary image processing information as an intermediary element. This preliminary information serves as a placeholder that enables transmission to proceed while the actual image processing information is being prepared or is being applied by the sink device. The preliminary information acts as a mediator between the source device's transmission needs and the sink device's display requirements.
3Measurement precision
If the source device requests capability information from the sink device, then accurate image processing can be achieved, but the communication overhead and processing time increase
Solution Approach 1:
The source device extracts only the essential capability information needed for preliminary image processing from the sink device, rather than requesting complete detailed information. It focuses on extracting key parameters such as HDR/SDR support, color space support, and resolution capabilities, which are sufficient for conducting preliminary image processing and enabling transmission.
4Manufacturing precision
If the source device performs different image processing for different video data characteristics, then optimal quality is achieved, but the processing complexity increases
Solution Approach 1:
The source device applies different image processing methods to different video data based on their specific characteristics. For HDR video data, it applies HDR-specific processing; for SDR video data, it applies SDR-specific processing. This local quality approach ensures optimal processing for each type of video data while maintaining manageable complexity through standardized processing pipelines for each category.
Data Source
AI summary
The present disclosure provides a method for transmitting video data by a source device, by using a high definition media interface (HDMI). In particular, the method comprises the steps of: receiving, from a sink device, capability information about whether reference display model (RDM)-based image processing of the sink device is supported; performing the RDM-based image processing on a plurality of pieces of video data, on the basis of the received capability information; and transmitting, to the sink device, (i) the plurality of pieces of video data on which the RDM-based image processing is performed and (ii) image processing information about a result of the RDM-based image processing, wherein the RDM-based image processing is (i) performed on the basis of a value of a feature of one piece of video data among the plurality of pieces of video data or (ii) performed on the basis of one feature value among feature values related to a separately set feature aside from values of features of the plurality of pieces of video data.