Dynamic Range Conversion for Unified SDR HDR Video Transmission
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Solution Overview
Problem
Current technologies face challenges in simplifying reception-side processing when transmitting both standard dynamic range (SDR) and high dynamic range (HDR) video data using a single method, as they require distinct processing approaches.
Innovation Solution
A transmission apparatus and method that performs dynamic range conversion on SDR video data to convert it into HDR video data, allowing for encoding and transmission in a container format, enabling similar processing for both SDR and HDR data at the reception end, with optional insertion of conversion information for easy conversion back to SDR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distinct processing approaches are used for SDR and HDR video data transmission, then transmission accuracy is maintained, but reception-side processing complexity increases
Solution Approach 1:
The patent merges SDR and HDR transmission processing into a unified workflow by converting SDR video data to HDR format before encoding. This allows both SDR and HDR content to follow the same transmission path and reception processing steps, eliminating the need for separate processing approaches while maintaining transmission accuracy through proper dynamic range conversion.
Solution Approach 2:
The patent applies preliminary dynamic range conversion by converting SDR video data to HDR format before the encoding and transmission process. This preliminary action ensures that SDR content is transformed into HDR format in advance, allowing it to be processed identically to native HDR content throughout the transmission pipeline, thereby simplifying reception-side processing.
2Device complexity
If a single transmission method is used for both SDR and HDR video data, then reception-side processing is simplified, but transmission precision may be compromised
Solution Approach 1:
The patent changes the dynamic range parameter of SDR video data by converting it to HDR format using appropriate conversion algorithms and transfer functions. This parameter transformation allows SDR content to be transmitted with the same precision and quality characteristics as native HDR content, maintaining transmission precision while enabling unified processing methods.
Solution Approach 2:
The patent introduces HDR format conversion as an intermediary step in the transmission pipeline for SDR content. This intermediary transformation allows SDR video data to be bridged into the HDR transmission framework, ensuring that both SDR and HDR content can be processed through the same method with maintained precision, as the conversion preserves essential visual information.
3Adaptability or versatility
If SDR video data is converted to HDR format, then unified transmission processing is achieved, but data processing time increases
Solution Approach 1:
The patent performs the dynamic range conversion as a preliminary action during the encoding stage, before transmission. By completing the SDR-to-HDR conversion early in the processing pipeline, the system achieves unified transmission processing for both SDR and HDR content while minimizing additional processing time during transmission and reception, as the conversion is already completed beforehand.
Data Source
AI summary
Reception-side processing performed in a case where transmission of standard dynamic range video data and transmission of high dynamic range video data coexist in a time sequence is simplified.SDR transmission video data is converted into SDR transmission video data through dynamic range conversion. The SDR transmission video data is the one obtained by performing, on SDR video data, photoelectric conversion in accordance with an SDR photoelectric conversion characteristic. In this case, the conversion is performed on the basis of conversion information for converting a value of conversion data in accordance with the SDR photoelectric conversion characteristic into a value of conversion data in accordance with an HDR photoelectric conversion characteristic. A video stream is obtained by performing encoding processing on HDR transmission video data. A container having a predetermined format and including this video stream is transmitted.