3D Shape Measurement Device Phase Pattern Stabilization
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Solution Overview
Problem
Existing three-dimensional shape measurement devices using the phase shift method face challenges in reducing measurement time due to the need to wait for the luminance of light to stabilize after a light source is applied, leading to increased measurement time and potential errors.
Innovation Solution
A three-dimensional shape measurement device that projects and images multiple phase pattern images in a specific order until the luminance of light stabilizes, allowing for immediate measurement based on captured images, reducing the overall measurement time and error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the imaging unit waits until the luminance of light does not temporally change after the light source applies light, then the measurement reliability is improved, but the measurement time increases
Solution Approach 1:
The patent applies preliminary action by pre-warming the light source before actual measurement begins. The control unit activates the light source in advance and waits for luminance stabilization (rising time) before projecting phase patterns and capturing images. This ensures that all subsequent measurements are taken under stable lighting conditions, improving reliability without adding waiting time to the actual measurement process.
Solution Approach 2:
The measurement process is segmented into distinct phases: a preliminary warm-up phase where the light source is activated and stabilized, followed by the actual measurement phase where phase patterns are projected and images are captured. This segmentation allows the system to prepare the lighting conditions in advance, separating the stabilization requirement from the measurement timing, thus improving reliability without extending measurement time.
2Measurement precision
If multiple phase pattern images are projected and imaged in sequence until rising time elapses, then the measurement precision is improved, but the process complexity increases
Solution Approach 1:
The control unit implements feedback by monitoring the luminance output of the light source and using this information to determine when the rising time has elapsed. The system continuously checks whether the light output has stabilized before proceeding with phase pattern projection and image capture, ensuring measurements are only taken when lighting conditions are optimal, thereby improving precision without requiring complex manual intervention.
Solution Approach 2:
The system dynamically adjusts the timing of phase pattern projection and image capture based on the real-time luminance status of the light source. Rather than using fixed timing, the control unit adapts the measurement process to the actual warm-up characteristics of the light source, allowing flexible scheduling of measurements once stability is achieved, thus improving precision while maintaining manageable complexity through automated control.
3Productivity
If the light source is activated in advance and phase pattern images are projected immediately, then the productivity is improved, but the measurement accuracy deteriorates due to unstable luminance
Solution Approach 1:
The system performs preliminary action by activating and stabilizing the light source before the actual measurement process begins. The control unit starts the light source in advance, allows it to reach stable luminance output (elapsed rising time), and only then proceeds with projecting phase patterns and capturing images. This approach ensures high measurement accuracy is achieved without sacrificing productivity, as the warm-up occurs in parallel with system initialization rather than adding sequential delay.
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
This approach enables faster and more accurate three-dimensional shape measurement by projecting and imaging phase pattern images in a controlled sequence, reducing the waiting time for light stabilization and minimizing measurement errors.
Implementation Method 1
each of a plurality of different phase pattern images is projected by a projection unit, and the phase pattern image is imaged by an imaging unit
Data Source
AI summary
A three-dimensional shape measurement device includes a controller, in which the controller starts a process in which a plurality of different phase pattern images is projected by a projector, whenever the phase pattern image is projected by the projector before a rising time elapses, the rising time being a time until the luminance of light does not temporally change after a light source of the projector applies the light, and measures a three-dimensional shape of a target object onto which the phase pattern image is projected on the basis of a captured image obtained by the camera after the process is performed.