Luminance Space Conversion for HDR SDR Display Consistency
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Solution Overview
Problem
Images displayed on HDR and SDR luminance ranges cannot be directly substituted due to differences in conversion rules and luminance value specifications, leading to inconsistent color and brightness across various combinations of content, image processing apparatuses, and display apparatuses, resulting in an undesirable viewing experience.
Innovation Solution
An information processing apparatus with an image data acquisition section, luminance space conversion section, and image output section that adjusts parameters based on display states to convert image signals from one luminance space to another, ensuring consistent display across HDR and SDR ranges using alpha blend processing and electro-optical transfer functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If image signals are converted between different luminance spaces (HDR/SDR) using fixed conversion rules, then the conversion process is simple and fast, but the displayed images have inconsistent color and brightness across different display apparatuses
Solution Approach 1:
The patent implements dynamic parameter adjustment in the luminance space conversion process. The parameter adjustment section modifies conversion parameters based on actual display states and measured luminance values, transforming the static conversion process into a dynamic adaptive one. This resolves the contradiction by making the conversion process flexible enough to maintain display consistency while managing complexity through automated feedback control.
Solution Approach 2:
The patent changes conversion parameters dynamically based on display state information. The parameter adjustment section modifies parameters such as gamma values and transfer function characteristics according to actual luminance measurements and display conditions. This approach maintains manufacturing precision (display consistency) by adapting parameters to specific display apparatuses while the automated nature of the adjustment manages the complexity burden.
2Manufacturing precision
If display apparatuses apply original processing for color development, then the display can be optimized for specific hardware characteristics, but the displayed images have color and brightness different from original design
Solution Approach 1:
The patent implements a feedback mechanism where the parameter adjustment section receives information about actual display states and luminance values, then adjusts conversion parameters accordingly. This closed-loop feedback system resolves the contradiction by allowing display optimization for specific hardware while using measured feedback to compensate for deviations from original design intent, achieving both color accuracy and adaptability.
Solution Approach 2:
The patent performs preliminary parameter adjustment based on expected display characteristics before actual image display. The parameter adjustment section pre-configures conversion parameters based on display apparatus information and anticipated display states, preparing the conversion process in advance. This preliminary action allows optimization for specific hardware while maintaining the ability to adjust based on actual performance.
3Adaptability or versatility
If images are displayed in HDR luminance range, then the luminance representation capability is enhanced, but images created for SDR cannot be directly displayed without conversion
Solution Approach 1:
The patent implements a universal luminance space conversion system that can handle both HDR and SDR images. The luminance space conversion section is designed to automatically detect input image type and apply appropriate conversion parameters, making the system capable of processing multiple luminance ranges through a single unified architecture. This resolves the contradiction by providing broad luminance range compatibility while managing conversion complexity through automated detection and parameter selection.
Solution Approach 2:
The patent uses an intermediary parameter adjustment section that mediates between SDR input images and HDR display requirements. This intermediary component performs the necessary luminance space conversion and parameter adjustment, acting as a bridge between the source image format and the display capability. The mediator approach resolves the contradiction by enabling HDR display of SDR content while isolating the conversion complexity within a dedicated processing stage.
Data Source
AI summary
A luminance space conversion section of an information processing apparatus converts an image signal represented in a luminance space corresponding to an SDR into a signal represented in a luminance space corresponding to an HDR, and outputs the converted signal to a synthesis processing section that performs alpha blend processing on an HDR image. In an adjustment mode, a parameter adjustment section allows a display apparatus to display an adjustment image represented in the SDR and adjusts a parameter used for a conversion of the luminance space so that a change in a display image is made small before and after converting the luminance space. The parameter is stored in a conversion parameter storage section after the adjustment and is used when a luminance signal conversion section performs conversion processing.