Two-Dimensional Flicker Measurement Using Dual-Frequency Correction
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Solution Overview
Problem
Existing methods for measuring the flicker amount of large display screens using high sampling frequencies face challenges due to reduced signal quality and increased data processing requirements, which are beyond the capabilities of normal two-dimensional imaging devices.
Innovation Solution
A two-dimensional flicker measurement apparatus that employs a photometric unit capable of performing photometry at both low and high sampling frequencies, with a correction unit using a calculated correction coefficient to accurately measure flicker amounts across multiple regions at a low sampling frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high sampling frequency is used to measure flicker amount accurately, then measurement precision is improved, but the S/N ratio of the output signal is reduced and data processing requirements increase beyond normal imaging device capabilities
Solution Approach 1:
The measurement process is segmented into two distinct phases: a calibration phase using high sampling frequency to establish the relationship between sampling frequency and measured flicker amount, and a measurement phase using low sampling frequency for actual multi-region flicker measurement. This segmentation allows the system to benefit from high sampling frequency calibration without requiring high sampling frequency during actual measurement, thus maintaining signal quality while achieving accurate measurements.
Solution Approach 2:
The calibration process is performed in advance to create a correction coefficient table that maps measured flicker amounts at low sampling frequency to true flicker amounts. This preliminary action stores the relationship between sampling frequencies and measurement accuracy, enabling subsequent measurements to use low sampling frequency while achieving high accuracy through lookup-based correction without requiring high-speed data processing during actual measurement.
2Measurement precision
If a high sampling frequency is used to measure flicker amount of multiple regions, then measurement precision is improved, but the data processing speed requirement increases beyond normal CPU capabilities
Solution Approach 1:
The calibration data and correction coefficients are computed in advance and stored in a table structure. During actual multi-region flicker measurement, the system simply performs lookup operations in this pre-computed table rather than performing complex real-time calculations. This preliminary computation of correction relationships transforms a computationally intensive real-time problem into a simple data retrieval operation, enabling accurate multi-region measurements without requiring high-speed CPU processing during measurement.
3Productivity
If a low sampling frequency is used for multi-region flicker measurement, then data processing demands are reduced, but measurement precision deteriorates
Solution Approach 1:
A correction coefficient table acts as an intermediary between the low sampling frequency measurements and the true flicker amounts. The table stores pre-computed correction relationships that map measured values at low sampling frequency to accurate flicker amounts. This intermediary structure allows the system to use efficient low sampling frequency measurements while achieving high measurement precision through the correction table, without requiring complex real-time calculations or high sampling frequency operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-accuracy flicker measurement across multiple regions on a display screen using a low sampling frequency, improving measurement precision and reducing data processing demands on the imaging device.
Implementation Method 1
a photometric unit having a first function of performing photometry in a two-dimensional region at a first sampling frequency and a second function of performing photometry in a region smaller than the two-dimensional region at a second sampling frequency higher than the first sampling frequency
Data Source
AI summary
A two-dimensional flicker measurement apparatus includes: a first calculation unit that calculates a flicker amount of each of a plurality of measurement regions set on a measurement target based on a photometric quantity obtained by performing photometry in the measurement target at a first sampling frequency; a second calculation unit that calculates a flicker amount of a predetermined measurement region set on the measurement target based on a photometric quantity obtained by performing photometry in the predetermined measurement region at a second sampling frequency; and a correction unit that corrects the flicker amount of each of the plurality of measurement regions calculated by the first calculation unit using a correction coefficient defined by the flicker amount calculated by the second calculation unit and a flicker amount of the predetermined measurement region calculated based on a photometric quantity obtained by performing photometry in the predetermined measurement region at the first sampling frequency.