Photographing Guide Device for Bridge Inspection Positioning
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Solution Overview
Problem
It is challenging to maintain long-term weather resistance for measuring devices like cameras and to ensure accurate repeated measurements of structures such as bridges, due to GPS errors and reduced accuracy near structures.
Innovation Solution
A photographing guide device that compares candidate images from potential capturing positions with registered images from a known capturing position, detecting positional and directional differences, and outputs information to guide the operator in aligning the camera for consistent captures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If GPS is used to determine capturing position, then positioning is simple and fast, but positioning accuracy deteriorates near structures and has inherent margin of error
Solution Approach 1:
The patent introduces image-based feature point matching as an intermediary method between GPS positioning and actual structure capture. The system uses detected feature points from registered images to calculate precise capturing positions and directions, serving as a mediator that corrects GPS inaccuracies near structures while maintaining the simplicity of GPS-based initial positioning.
2Reliability
If measuring device group is moved between measurements, then long-term weather resistance is maintained and cost is reduced, but capturing position consistency becomes difficult
Solution Approach 1:
The system implements feedback by detecting feature points in captured images, comparing them with registered images, and calculating the actual capturing position and direction. This feedback loop allows the system to identify positional deviations and guide operators to adjust the camera position, ensuring consistent capturing positions even when devices are moved between measurements.
3Measurement precision
If capturing position is adjusted frequently, then measurement accuracy is maintained, but operation time and complexity increase
Solution Approach 1:
The system performs preliminary action by pre-registering images and their corresponding capturing positions and directions before actual measurements. When conducting measurements, the system compares captured images with pre-registered ones, allowing operators to quickly identify and correct positional deviations without extensive manual adjustment, thus reducing operation time while maintaining accuracy.
Data Source
AI summary
A photographing guide device includes a detection means and an output means. The detection means compares a candidate image of a structure captured from a capturing candidate position in a capturing candidate direction with a registered image of the structure captured from a given capturing position in a given capturing direction and stored in advance, thereby detecting a positional difference between the capturing candidate position and the given capturing position. The output means outputs information indicating the detected positional difference.