Mobile Camera Calibration Using Embedded Patterns for 3D Measurement
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Solution Overview
Problem
Smart mobile devices lack an efficient method for making accurate three-dimensional measurements and color/brightness assessments of objects using their cameras, due to limitations in calibration and measurement precision.
Innovation Solution
Incorporating calibration patterns, such as two-dimensional bar codes or geometric patterns, within the focus plane of the camera's field of view, which allow for calibration and enable precise measurements of object dimensions, distances, and color/brightness levels by analyzing the captured images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If smart mobile devices use their cameras to capture images for measurement purposes, then the device portability and ease of use are maintained, but the measurement precision and reliability are insufficient due to lack of proper calibration methods
Solution Approach 1:
The patent applies preliminary action by incorporating calibration patterns (such as QR codes or geometric patterns with known dimensions) into the imaging setup before actual measurements are taken. The mobile device first captures an image containing both the calibration pattern and the target object, then uses the known dimensions of the calibration pattern to calculate camera parameters (focal length, pixel density, perspective distortion) that are stored and applied to subsequent measurement images, thereby enabling precise measurements while maintaining ease of use.
2Measurement precision
If calibration patterns are incorporated into the image capture process, then measurement precision is improved, but the device complexity and operation difficulty increase
Solution Approach 1:
The patent applies self-service by designing the calibration process to be automatically performed by the mobile device itself. The device captures an image containing the calibration pattern, automatically detects and decodes the pattern (using built-in image processing and QR code recognition capabilities), calculates the necessary calibration parameters, and stores them for future use. This eliminates the need for external calibration equipment or complex manual procedures, thereby improving measurement precision without significantly increasing device complexity.
3Ease of operation
If traditional measurement methods are used without calibration patterns, then the operation remains simple, but the reliability and accuracy of three-dimensional measurements and color assessments are insufficient
Solution Approach 1:
The patent applies the intermediary principle by introducing calibration patterns (such as QR codes or geometric patterns with known dimensions and color standards) as a mediator between the mobile device camera and the target object. These calibration patterns serve as a reference standard that enables the device to calculate perspective distortion, scale factors, and color calibration data, thereby improving the reliability of three-dimensional measurements and color assessments while requiring minimal additional operation from the user.
Data Source
AI summary
A digital image is captured. The captured digital image includes a calibration pattern. The calibration pattern includes displayed information about the calibration pattern. The displayed information is read to obtain calibration information about the captured digital image.