Display Color Calibration Using Mobile Camera and Fiducial Markers
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Solution Overview
Problem
Conventional color display device calibration requires specialized equipment like colorimeters or spectrophotometers, which most individuals do not have regular access to, making it difficult to adjust color display devices to desired color responses.
Innovation Solution
Utilizing the camera of a mobile device, such as a smartphone or tablet, to measure actual colors output by a color display device through test patterns with fiducial markers, guided by augmented reality technology, allowing for calibration without specialized equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a colorimeter or spectrophotometer is used for calibration, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a mobile device camera to capture images of color test patterns as a copy/alternative to the expensive colorimeter or spectrophotometer. The camera captures the actual colors displayed on the screen, and image processing algorithms extract color information to perform calibration without requiring specialized measurement hardware.
Solution Approach 2:
The patent introduces an intermediary system consisting of a mobile device with camera and processing software that mediates between the color display device and the calibration process. This intermediary uses computational methods to extract color data from captured images, eliminating the need for direct contact with specialized measurement instruments.
2Measurement precision
If a colorimeter is used for calibration, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables the mobile device to perform calibration functions independently using its own camera and processing capabilities. The system automatically captures images, processes color data, and generates calibration profiles without requiring manual intervention or specialized operator knowledge, making calibration accessible to end users.
Solution Approach 2:
The patent makes the mobile device universal for calibration purposes by leveraging its existing camera and processing capabilities. The same mobile device that users already possess can perform calibration functions, eliminating the need for separate specialized equipment and simplifying the overall calibration process.
3Productivity
If multiple colors are measured simultaneously, then productivity is improved, but measurement precision may be compromised
Solution Approach 1:
The patent segments the color measurement process by displaying test patterns with specific color information for each region, and the mobile device captures images of these segmented color regions. This allows multiple colors to be measured simultaneously in different spatial locations on the display device, improving calibration speed while maintaining precision through targeted color sampling.
Solution Approach 2:
The patent transitions from sequential color measurement to simultaneous spatial color measurement by capturing multiple colors in a single image. The mobile device camera captures all test pattern colors at once, and image processing algorithms extract color data from different spatial regions, effectively adding a spatial dimension to the measurement process.
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 accurate color calibration of display devices using a mobile device, reducing the need for specialized instruments and minimizing calibration time by measuring multiple colors simultaneously.
Implementation Method 1
controlling the camera to capture an image of the test pattern
Data Source
AI summary
A method includes controlling an integrated camera of a mobile device to detect a plurality of fiducial markers displayed as part of a test pattern on a display surface of a color display device, wherein the test pattern is one of a plurality of test patterns, estimating a position of the integrated camera relative to the display surface, using the plurality of fiducial markers, augmenting a live image of the test pattern on a display of the mobile device with an overlay, controlling, in response to a position of the overlay being aligned on the display of the mobile device with the live image of the test pattern, the integrated camera to capture an image of the test pattern, and calculating an adjustment to a color setting of the color display device, wherein the adjustment is calculated using information extracted from the image.