Displacement Measurement Synchronization for Precision Imaging
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Solution Overview
Problem
Conventional measurement apparatuses struggle to effectively measure displacement and compute lengths between points on a measurement object while obtaining a two-dimensional image, as they lack efficient methods for synchronizing displacement measurement with image acquisition and processing.
Innovation Solution
A measurement apparatus comprising a displacement measuring unit, an image obtaining unit, and an image measuring unit that computes lengths between points on the object from the obtained image, with controlled optical arrangements for focus adjustment and timing synchronization, and a storage unit for feature point relationships to calculate distances based on measurement results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If displacement measurement and image acquisition are performed simultaneously without coordination, then measurement speed is improved, but measurement precision deteriorates due to focus mismatch and timing differentials
Solution Approach 1:
The system performs preliminary focus adjustment based on displacement measurement results before acquiring the two-dimensional image. The control unit adjusts the focus of the imaging device according to the measured displacement, ensuring the object is in focus when the image is captured, thereby maintaining measurement precision while enabling simultaneous operation
Solution Approach 2:
The system uses feedback from the displacement measurement unit to dynamically adjust the imaging device's focus and timing. The control unit receives displacement data and uses it to optimize image acquisition parameters in real-time, creating a closed-loop system that maintains precision during high-speed operation
2Manufacturing precision
If the imaging device is continuously adjusted to maintain focus during displacement measurement, then image quality is improved, but device complexity increases
Solution Approach 1:
The measurement apparatus integrates multiple functions into a unified system: the displacement measurement unit and imaging device share a common control structure, and the control unit performs both focus adjustment and timing synchronization functions. This multi-functionality reduces the need for separate independent systems while maintaining image quality
Solution Approach 2:
The system uses the displacement measurement data to automatically adjust its own imaging parameters without external intervention. The control unit self-regulates the focus and timing based on the measured displacement, eliminating the need for manual adjustment mechanisms or additional complex control systems
3Productivity
If length computation is performed from the obtained image without calibration data, then computation speed is improved, but measurement precision deteriorates
Solution Approach 1:
The system performs preliminary calibration by storing the relationship between known distances on the object and measured distances in the image. This calibration data is prepared in advance and stored in the storage unit, enabling rapid length computations later without sacrificing precision
Solution Approach 2:
The system introduces calibration data as an intermediary element that bridges the image space and real-world measurements. The stored relationship between known object distances and image distances serves as a conversion factor, enabling accurate length computation from images while maintaining computational efficiency
Data Source
AI summary
In a measurement apparatus, higher-quality measurement is realized in measurement of measurement object displacement or imaging of a two-dimensional image. In a controller, a light receiving signal of a photodiode is supplied to a displacement measuring unit of a sensor head in order to measure a height of a measurement object, and the height of a surface of the measurement object is measured based on the light receiving signal. Then, in the controller, image obtaining timing is determined based on the height of the measurement object. Specifically, a focus adjustment value corresponding to the computed height of the measurement object is obtained from the table, and an image obtaining signal is transmitted to an imaging device at the timing the focus adjustment value is realized. Therefore, a length between two points on the measurement object is computed from the thus obtained image based on the height of the measurement object.