3D Position Measuring Module with Omnidirectional Camera and Accelerometer
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Solution Overview
Problem
Existing three-dimensional position measurement systems face constraints when measuring inclined surfaces, as they require the pointing rod to remain still during measurement, limiting their operational flexibility.
Innovation Solution
A system incorporating a target, omnidirectional camera, and triaxial accelerometer, which calculates the three-dimensional position of a measurement point by measuring distances and angles to the target, and using light output and camera projections to determine directional vectors, allowing measurement without the need for a special operation constraint, even when the module is inclined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two prisms are fixed to two points separated by a known length and the prisms at the two points are measured, then the position of a measurement point can be calculated based on three-dimensional positions of the two points, but the pointing rod (prisms) must be made to stand still during measurement of the two points, creating operation constraints
Solution Approach 1:
The patent replaces the mechanical requirement of keeping the pointing rod stationary with an optical solution. By using an omnidirectional camera to capture images of the target at multiple measurement points simultaneously, and using vector calculations based on light propagation directions, the system eliminates the need for mechanical stability during the measurement process. The measurement can be performed dynamically without constraining the operator's movements.
2Measurement precision
If a prism is fixed to a pointing rod at a known fixed length from the measurement point and the vertical state is secured using a bubble tube, then the three-dimensional position of the measurement point can be calculated, but this method cannot be used when the pointing rod must be inclined
Solution Approach 1:
The patent transforms the static measurement system into a dynamic one. Instead of requiring the pointing rod to maintain a fixed vertical state, the system uses an omnidirectional camera to capture images regardless of the rod's orientation. The triaxial accelerometer dynamically adjusts the coordinate system based on the actual inclination angle, allowing the system to adapt to any pointing rod position while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the measurement parameters from fixed vertical coordinates to dynamic coordinates that adapt to the pointing rod's inclination. By using the triaxial accelerometer to detect the inclination angle and adjusting the coordinate transformation accordingly, the system can accurately measure positions even when the pointing rod is inclined at various angles, thus expanding the measurement capabilities.
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
Enables accurate three-dimensional position measurement of a point without requiring the measuring module to be in a specific posture, enhancing operational flexibility and measurement accuracy.
Implementation Method 1
a target 35 and an omnidirectional camera 36
Implementation Method 2
a triaxial accelerometer 34 which measures a three-dimensional acceleration
Implementation Method 3
a light output section 18 that outputs light toward the target direction and a measurement section 20 that performs distance measuring and angle measuring to the target
Data Source
AI summary
Provided is a three-dimensional position measuring system, a three-dimensional position measuring method, and a measuring module with which measurement can be performed without a special operation constraint even in state where a measuring module is inclined. The three-dimensional position measuring system includes a measuring module that includes a target, an omnidirectional camera, and a triaxial accelerometer, and is grasped a positional relationship among the target, the omnidirectional camera, and a measurement point, and a surveying instrument including a light output section that outputs light toward the target and a measurement section that performs distance measuring and angle measuring to the target. Since the measuring module including the target is equipped with the omnidirectional camera and the triaxial accelerometer, a posture direction of the measuring module can be identified.