Optical Measuring Device Ambient Light Synchronization
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Solution Overview
Problem
Existing optical measuring devices using pattern projection methods face challenges in accurately determining the boundary between bright and dark portions due to ambient light interference, leading to reduced measurement accuracy and increased measurement time.
Innovation Solution
A measuring device that acquires information on the period of ambient light intensity and controls the projection and imaging of complementary light patterns to synchronize imaging with the ambient light cycle, reducing ambient light effects by adjusting the number and timing of pattern projections and image acquisitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If imaging is synchronized with the period of ambient light intensity to reduce ambient light effects, then measurement accuracy is improved, but measurement time increases due to waiting time for synchronization
Solution Approach 1:
The control unit acquires information on the period of ambient light intensity in advance before performing the measurement. This preliminary acquisition of timing information allows the system to plan and execute pattern projection and imaging operations without waiting for synchronization moments, thereby reducing measurement time while still eliminating ambient light effects through computational processing.
Solution Approach 2:
The invention replaces the mechanical timing synchronization approach with a computational solution. Instead of physically waiting for specific timing moments in the ambient light cycle, the system captures images at arbitrary timings and uses a processor to calculate intersection points by considering the ambient light period information, thereby substituting physical synchronization with mathematical processing.
2Measurement precision
If complementary patterns of light are projected to determine boundary positions, then measurement accuracy is improved, but measurement reliability deteriorates due to ambient light causing intersection point deviations
Solution Approach 1:
The control unit acquires feedback information about the ambient light period and uses this information to adjust the imaging timing and processing. By incorporating ambient light period information into the measurement process, the system can compensate for ambient light effects and maintain reliable intersection point determination even in the presence of varying ambient light conditions.
Solution Approach 2:
The invention changes the parameter of imaging timing from fixed synchronization-based timing to flexible timing determined by ambient light period information. By using the acquired ambient light period to determine optimal imaging timings and to guide the intersection point calculation process, the system maintains measurement reliability while improving accuracy.
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 enhances measurement accuracy and reduces measurement time by minimizing ambient light interference while maintaining accurate determination of intersection points.
Implementation Method 1
a projector configured to project a first pattern of light having bright portions and dark portions or a second pattern of light having the bright portions and the dark portions of the first pattern in reverse onto the object
Implementation Method 2
an imaging unit configured to acquire image data by imaging the object onto which the patterns of light are projected
Data Source
AI summary
A measuring device for measuring an object includes a controller, a projector, an imaging unit, and a processor, the controller controls the projector and the imaging unit to start projection and imaging in a second condition after starting projection and imaging in a first condition, and to start imaging in the second condition with a time interval of an integer multiple of a period of intensity of light other than a pattern of light from an imaging start time in the first condition, and the processor obtains intersection point positions of gradation values between image data obtained at the same imaging time in each condition among image data obtained at each imaging time in the first condition and image data obtained at each imaging time in the second condition, and calculates the shape information based on the obtained intersection point positions.