Luminance Calibration for Display Image Detail Preservation
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Solution Overview
Problem
Existing image processing technologies struggle to faithfully reproduce the intended luminance range of original images on display apparatuses, often resulting in loss of detail in high-luminance regions due to compression, leading to inconsistent image visibility across different display systems.
Innovation Solution
An image processing apparatus that includes a calibration section to acquire luminance characteristics of the display apparatus, a luminance transforming section to adjust pixel values, and an output section to ensure the image is displayed with optimal luminance, using a calibration screen image to adjust settings based on user input and display-specific information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If luminance range compression is performed to adapt HDR images to SDR display apparatuses, then the image can be displayed on the display apparatus, but detail information in high-luminance regions is lost
Solution Approach 1:
The system performs preliminary luminance transformation and calibration before final display output. The calibration section pre-acquires luminance characteristics of the display apparatus, and the luminance transforming section pre-adjusts pixel values based on these characteristics, ensuring optimal luminance mapping before the image is rendered on the display apparatus.
Solution Approach 2:
The system dynamically changes luminance parameters by acquiring actual luminance characteristics of the display apparatus and transforming pixel values based on these measured parameters. The calibration process adjusts luminance values to match the specific characteristics of each display apparatus, optimizing the balance between adaptability and information preservation.
2Productivity
If standard luminance transformation is applied without calibration, then processing is simple and fast, but image visibility changes depending on display apparatus characteristics
Solution Approach 1:
The system performs preliminary calibration to acquire luminance characteristics of the display apparatus before actual image processing. This pre-acquisition of display-specific parameters enables consistent image visibility across different apparatuses while maintaining efficient processing during actual operation.
Solution Approach 2:
The calibration section acquires luminance characteristics by detecting actual display output, creating a feedback loop that characterizes each display apparatus. This feedback information is then used by the luminance transforming section to adjust pixel values, ensuring reliable and consistent image visibility across different display devices.
3Measurement precision
If luminance characteristics are acquired through user manipulation, then accurate display-specific calibration is achieved, but calibration process time increases
Solution Approach 1:
The system enables the display apparatus to self-characterize through user manipulation during calibration. The calibration section acquires luminance characteristics by detecting the actual output of the display apparatus itself, allowing the system to automatically adapt to each device without requiring external measurement equipment or complex setup procedures.
Data Source
AI summary
An image processing apparatus includes a calibration section acquiring luminance characteristics of a display apparatus on a basis of a user manipulation for a calibration screen image displayed on the display apparatus, a luminance transforming section transforming a range of luminance composing a pixel value of an image into a range of luminance with which the image can be outputted as a display image on a basis of the luminance characteristics, and an output section outputting data associated with an image having the luminance after the transformation as a pixel value. The calibration section adjusts an initial state of the calibration screen image on a basis of information peculiar to the display apparatus, and then causes the calibration screen image to be displayed on the display apparatus.