Monitor Calibration Using Luminance Measurement and Interpolation
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Solution Overview
Problem
Conventional monitor calibration methods are time-consuming and costly due to the need for multiple luminance measurements and accurate reflectance determination, especially when ambient light intensity is not uniform, which can lead to errors in symptom observation from medical images.
Innovation Solution
A monitor calibration device and method that includes a luminance measurement device, memory, and calculation circuit to determine the range of the product of reflectance and ambient light intensity, generating multiple brightness curves through luminance measurements, and interpolating to find a target brightness curve that meets specific conditions, thereby simplifying the calibration process and reducing hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple luminance measurements are conducted on multiple spots of the monitor to avoid errors from non-uniform ambient light, then measurement precision is improved, but loss of time and device complexity increase
Solution Approach 1:
The patent combines multiple luminance measurements from different spots into a single representative measurement by measuring the luminance of a uniform grayscale pattern displayed on the monitor. This merging approach maintains measurement precision while significantly reducing calibration time by avoiding the need to measure multiple separate spots.
Solution Approach 2:
The patent introduces a uniform grayscale test pattern as an intermediary element. By displaying this pattern and measuring its luminance, the system obtains a representative measurement that reflects the overall monitor performance under ambient light conditions without requiring multiple spot measurements.
2Measurement precision
If multiple luminance measurements are conducted on multiple spots of the monitor to avoid errors from non-uniform ambient light, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the functions of multiple measurement points into a single measurement system. By measuring a uniform grayscale pattern displayed across the monitor, the system obtains comprehensive calibration data without requiring multiple physical sensors or measurement devices positioned at different locations.
Solution Approach 2:
The patent makes the luminance measurement device multi-functional by using it to measure a displayed test pattern that represents the entire monitor's performance. This single measurement serves multiple purposes: characterizing luminance, assessing uniformity impact, and determining calibration parameters, thereby reducing device complexity.
3Manufacturing precision
If accurate reflectance of the monitor is determined in advance to enable calibration, then manufacturing precision is improved, but loss of time and device complexity increase
Solution Approach 1:
The patent enables the monitor to perform its own calibration by measuring the luminance of a displayed test pattern under ambient light conditions. The system calculates the product of reflectance and ambient light intensity directly from the luminance measurement, eliminating the need for separate reflectance measurement equipment and procedures.
Solution Approach 2:
The patent changes the calibration approach from measuring reflectance as a separate physical parameter to calculating the effective parameter (product of reflectance and ambient light intensity) directly from luminance measurements. This parameter transformation simplifies the calibration process and reduces time requirements.
4Manufacturing precision
If accurate reflectance of the monitor is determined in advance to enable calibration, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent enables the monitor system to perform self-calibration by using its own displayed output as the measurement target. The luminance measurement device measures the luminance of a uniform grayscale pattern displayed on the monitor, and the system automatically calculates calibration parameters, eliminating the need for external reflectance measurement equipment.
Solution Approach 2:
The patent transforms the calibration process from requiring separate reflectance measurement to calculating the effective calibration parameter (product of reflectance and ambient light intensity) directly from luminance measurements of a displayed pattern. This parameter change eliminates complex reflectance measurement hardware.
Data Source
AI summary
A monitor control method is used for controlling a monitor and includes the following steps: controlling the monitor to display a pattern; selecting, in response to a selection signal, one of a plurality of brightness curves as a target brightness curve, or generating by interpolation the target brightness curve; and controlling the brightness of the monitor according to the target brightness curve.