Photogrammetry System for Moving Object Speed and Length Measurement
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Solution Overview
Problem
Current methods for measuring the speed and length of moving objects, such as radar and laser speed measurement instruments, are costly and lack accuracy, and existing photogrammetry systems require complex calibration and are not adaptable for real-time measurement of moving vehicles during X-ray scanning.
Innovation Solution
A photogrammetry system using one or two photographing devices positioned perpendicular to the object's movement, capable of capturing multiple images at predetermined intervals, and a data processing device to calculate the object's speed and length using simple formulas, eliminating the need for complex calibration and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar or laser speed measurement instruments are used, then measurement accuracy is improved, but cost increases and service life is limited
Solution Approach 1:
The patent replaces traditional radar or laser speed measurement instruments with a photogrammetry-based optical measurement system. By using photographing devices to capture images at different positions and applying geometric calculations, the system achieves speed and length measurement without mechanical contact or expensive electronic sensors, thereby reducing cost while maintaining measurement capability
Solution Approach 2:
The patent uses image copying through photographing devices to obtain multiple views of the moving object. By capturing images at different positions and using these optical copies for measurement calculations, the system avoids direct physical measurement instruments, reducing wear and cost while enabling repeated measurements
2Measurement precision
If complex calibration procedures are implemented, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables the measurement system to automatically determine calibration parameters through image processing and geometric calculations. The system uses the captured images and known photographing positions to self-calibrate by calculating actual lengths and speeds through formula-based computations, eliminating the need for manual calibration procedures
Solution Approach 2:
The patent transforms the calibration process from manual parameter adjustment to automatic parameter calculation. By changing from fixed calibration values to dynamically calculated parameters based on image data and photographing geometry, the system achieves both precision and operational simplicity
3Measurement precision
If traditional measurement methods are used for moving objects, then measurement capability is achieved, but adaptability to real-time measurement deteriorates
Solution Approach 1:
The patent transitions from static measurement methods to dynamic real-time measurement. By continuously capturing images at different positions along the movement path and performing real-time geometric calculations, the system adapts to moving objects while maintaining measurement precision through dynamic image processing
Solution Approach 2:
The patent uses periodic image capture at predetermined intervals along the movement path. By taking photographs at regular position intervals and calculating measurements based on these periodic captures, the system achieves real-time adaptability while maintaining accurate speed and length measurement through systematic sampling
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
The system provides accurate and cost-effective measurement of moving objects' speed and length without tedious calibration, enabling efficient quality control and traffic management.
Implementation Method 1
one or two photographing devices...being able to photograph the object to be measured for at least two times at a predetermined time interval to obtain two images
Data Source
Figure 1~2(b)
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Figure 5~6
AI summary
The present invention relates to a photogrammetry system and method. The photogrammetry system comprises: photographing devices capable of photographing an object at a predetermined time interval; and, a data processing device capable of calculating an actual length of the object or a certain portion on the object according to a length of the object or a certain portion on the object in the images obtained by the photographing devices and a distance of the object in the two images, wherein the object moves at a speed V; the photographing devices photograph the object for two times at a time interval t; the distance of the object in the two images obtained by the two times of photographing is Dp; the length of the object or a certain portion on the object in the images is Lp; and, the actual length L of the object or a certain portion on the object may be obtained by the following formula: L=Lp×VtDp.