Optical Measurement Error Determination via Image Offset Analysis
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Solution Overview
Problem
Measurement devices, such as optical surveying instruments, suffer from inaccuracies due to manufacturing tolerances, leading to tilting axis and side collimation errors that result in measurement errors, requiring frequent and time-consuming calibration processes.
Innovation Solution
A measurement error determination device that uses an image sensor unit to obtain digital images from different orientations, processing these images to determine the offset between pixel positions and correct for measurement errors, allowing for quick and secure calibration of the measurement device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used to correct measurement errors, then measurement precision is improved, but time consumption increases due to frequent calibration requirements
Solution Approach 1:
The patent replaces the mechanical calibration process with an optical/image processing approach. By capturing images of the measurement scale at different orientations and using image correlation algorithms, the system automatically determines calibration parameters without manual intervention, thereby reducing time consumption while maintaining measurement precision
Solution Approach 2:
The measurement device performs self-calibration by automatically capturing images, processing them through correlation algorithms, and generating calibration parameters without external intervention. This self-service capability eliminates the need for frequent manual calibration operations, reducing time loss while preserving measurement accuracy
2Reliability
If manual calibration procedures are performed to eliminate measurement errors, then reliability of measurements is improved, but device complexity increases due to additional calibration operations
Solution Approach 1:
The patent replaces complex manual calibration procedures with an automated image processing system. The measurement device captures images of the scale and uses correlation algorithms to automatically determine calibration parameters, simplifying the overall device operation while maintaining measurement reliability
Solution Approach 2:
The system creates digital copies (images) of the measurement scale at different orientations and uses these copies to determine calibration parameters through image correlation. This copying approach replaces physical manipulation and simplifies the calibration process while ensuring reliable measurements
Data Source
AI summary
For swift and secure determination of a measurement error a first digital image is obtained using an image sensor, wherein a line of sight of an optical arrangement is oriented in a first face direction. A characteristic image area in the first digital image on an image sensor is determined. A second digital image is then taken with a line of sight of the image sensor oriented in a second face and the characteristic image area defined in the first image is searched in the second digital image, the first or the second digital image is rotated in the image plane by 180° . Then in the second digital image the position of the characteristic image area is determined. And offset between the characteristic image area in the first digital image and the characteristic image area in the second digital image is determined.