Apparatus and method for improving perceptual luminance nonlinearity-based image data exchange between different display functions

JP7863448B2Active Publication Date: 2026-05-21DOLBY LABORATORIES LICENSING CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
DOLBY LABORATORIES LICENSING CORP
Filing Date
2022-04-20
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing displays, particularly those with standard dynamic range (SDR), struggle to accurately render high dynamic range (HDR) images captured by cameras due to significant differences in dynamic range, leading to visually perceptible errors and artifacts like banding and contour distortion.

Method used

A reference grayscale display function (GSDF) is generated using a contrast sensitivity function (CSF) model to determine just noticeable differences (JNDs) across varying light levels and spatial frequencies, ensuring that encoded image data is distributed to match human perception nonlinearity, allowing for efficient transcoding to support a wide range of display devices without artifacts.

Benefits of technology

The GSDF ensures that visually distinguishable details are preserved across different display devices, minimizing perceptible errors and artifacts, and enabling high-quality rendering of HDR images on SDR and HDR displays.

✦ Generated by Eureka AI based on patent content.

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Abstract

An image processing device and method for improving perceptual luminance nonlinearity-based image data exchange between different display capabilities is provided. The handheld image processing device includes a data receiver that receives reference-encoded image data, the data including reference code values ​​encoded by an external encoding system. The reference code values ​​represent reference gray levels selected using a reference grayscale display function based on perceptual nonlinearities of human vision adapted to spatial frequencies at various light levels. The image processing device also includes a data converter that accesses a code mapping between the reference code values ​​and device-specific code values ​​that result in gray levels specific to the image processing device. Based on the code mapping, the data converter transcodes the reference-encoded image data into device-specific image data encoded with the device-specific code values.
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