Image Display Device Performance Evaluation Using Luminance and Chromaticity Boundaries

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Solution Overview

Problem

Manual measurement of image display device performance using luminance and chromaticity meters is time-consuming and requires specialized equipment, necessitating a simpler evaluation method.

Innovation Solution

Displaying luminance and chromaticity evaluation images with progressive changes within defined regions on the image display device, allowing for intuitive evaluation by identifying the boundary of luminance or chroma saturation, using standards like SMPTE ST2084 and ITU-R BT.2020 to assess performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual measurement using luminance and chromaticity meters is performed, then measurement precision is improved, but device complexity and time consumption increase

Engineering Contradiction:

Improveluminance and chromaticity measurement accuracyVSAvoidmeasurement equipment requirements

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent uses test images containing luminance and chromaticity information that are displayed on the image display device, then captured by a camera to create a digital copy of the displayed content. This digital copy is then analyzed to extract luminance and chromaticity characteristics, replacing the need for physical luminance and chromaticity meters while maintaining measurement capability through image processing

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical/optical measurement system (luminance meter and chromaticity meter) with an electronic/image processing system. Instead of using physical sensors to directly measure light properties, the system uses digital test images captured by a camera and processes them through image processing algorithms to derive luminance and chromaticity information

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If manual measurement procedures are used, then measurement precision is improved, but productivity decreases

Engineering Contradiction:

Improveperformance evaluation accuracyVSAvoidevaluation time

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent prepares test images in advance with predetermined luminance and chromaticity information embedded in specific regions. These test images are designed beforehand to cover the full range of luminance and chromaticity values, allowing the evaluation process to simply involve displaying the pre-prepared image and capturing it, eliminating the need for manual measurement procedures during the actual evaluation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system captures a digital copy of the displayed test image and processes it automatically through image processing to extract luminance and chromaticity characteristics. This automated image processing and analysis dramatically reduces the time required compared to manual measurements while maintaining measurement precision through systematic algorithmic analysis

Inventive Principle:

Principle #26Copying

3Ease of operation

If visual evaluation methods are used, then ease of operation is improved, but measurement precision deteriorates

Engineering Contradiction:

Improveevaluation simplicityVSAvoidboundary position accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent employs image processing to automatically detect the boundary position between luminance and chromaticity saturation regions in the captured test image. The system analyzes the image data to precisely determine where the saturation occurs, providing objective feedback on the display device's performance characteristics without relying on subjective visual estimation

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces subjective visual evaluation with automated image processing and analysis. Instead of relying on human observers to visually estimate boundary positions, the system uses digital image processing algorithms to objectively and precisely determine the saturation boundaries, eliminating human subjectivity while maintaining ease of operation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS10458847B2Method and system for evaluating performance of image display device

Publication Date: 2019.10.29 IMAGICA LAB INC

AI summary

A luminance evaluation image 1 has a determination portion 3 configured such that luminance changes progressively between low and high luminance regions 3a and 3b defined to have luminance levels lower and higher than an upper limit of luminance displayable on the image display device 4, respectively. A chromaticity evaluation image has a determination portion configured such that chroma changes progressively between low and high chroma regions defined to have chroma levels lower and higher than an upper limit of chroma displayable on the image display device 4, respectively. At least either the luminance evaluation image or chromaticity evaluation image is displayed on the image display device 4 to evaluate characteristics of the image display device 4 from a position of a boundary B1 in the determination portion 3.