HDR Signal Processing for Consistent Multi-Interface Video Display

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Solution Overview

Problem

Existing technologies struggle to satisfactorily handle HDR video signals with varying signal interfaces, leading to inconsistent video display on monitors due to differences in opto-electrical and electro-optical transfer functions.

Innovation Solution

A signal processing device and method that performs grayscale compression and decompression processes using opto-electrical and electro-optical transfer functions to adapt HDR video signals to different signal interfaces, ensuring consistent video display across monitors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If HDR video signals use different signal interfaces (OETF/EOTF variations), then the video signal can be adapted to different display requirements, but the video displayed on monitors will look different due to varying OOTF characteristics

Engineering Contradiction:

Improvesignal interface compatibilityVSAvoidvideo display consistency

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent introduces an OOTF correction unit as an intermediary component between the signal interface conversion process and the final video output. This unit applies opto-optical transfer function correction to compensate for display characteristic variations, ensuring that videos from different signal interfaces (HLG, PQ, S-Log3) display consistently on monitors. The OOTF correction acts as a mediator that reconciles the adaptability of multiple interfaces with the stability of consistent video appearance.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If OETF and EOTF are varied to support multiple HDR signal interfaces, then signal interface versatility is improved, but video correction characteristics during monitor display vary causing inconsistent video appearance

Engineering Contradiction:

ImproveHDR signal interface supportVSAvoidvideo display accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent dynamically changes the OOTF correction parameters based on the detected signal interface type. When different HDR interfaces (HLG, PQ, S-Log3) are detected, the system adjusts the corresponding OOTF correction characteristics to compensate for each interface's specific display behavior. This parameter adaptation allows the system to maintain precise video display accuracy across multiple signal interfaces while preserving full interface versatility.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4013026B1Signal processing device, signal processing method, camera system, video system, and server

Publication Date: 2026.04.22 SONY GROUP CORP

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AI summary

To enable HDR video signals of a plurality of signal interfaces to be satisfactorily handled. [Solution] A processing unit processes a linear high dynamic range video signal and obtains a high dynamic range video signal that has undergone a grayscale compression process. The processing unit is able to perform grayscale compression processes of a plurality of signal interfaces. For example, when a grayscale compression process of another signal interface other than a reference signal interface is performed, the processing unit further performs a process of adding characteristics of system gamma of the reference signal interface and a process of cancelling out characteristics of system gamma of the other signal interface.