Event-Based Imaging for Accurate Shape Measurement Under Disturbance Light
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Solution Overview
Problem
Shape measuring devices using non-scanning imaging devices face inaccuracies due to the influence of disturbance light and irradiation light reflecting conditions, leading to incorrect shape measurements.
Innovation Solution
An imaging device with an imaging section that detects luminance changes exceeding a threshold and an event suppression section that removes events outside predetermined position ranges, along with a light projecting section to irradiate and receive reflected light, utilizing a non-scanning imaging device called a DVS to enhance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a non-scanning imaging device is used for shape measurement, then imaging speed and responsiveness are improved, but measurement precision deteriorates due to disturbance light and irradiation light reflection
Solution Approach 1:
The patent extracts and removes unnecessary events (disturbance light and irradiation light reflections) from the detected event data through the event suppression section. This allows the system to maintain high imaging speed while eliminating harmful reflected light events that would otherwise degrade measurement precision
Solution Approach 2:
The patent implements feedback by using detected event position information to dynamically suppress subsequent unnecessary events. The system learns from detected patterns and adjusts event suppression based on feedback from previous detections, maintaining precision without sacrificing imaging speed
2Loss of information
If all detected events are used for shape measurement, then measurement completeness is improved, but measurement precision deteriorates due to inclusion of unnecessary events from disturbance light reflection
Solution Approach 1:
The event suppression section extracts and removes unnecessary events (disturbance light and irradiation light reflections) from the complete set of detected events. This maintains measurement completeness by retaining valid events while eliminating harmful ones that would otherwise contaminate the measurement data
Solution Approach 2:
The event suppression section acts as an intermediary between the imaging section and shape measurement processing. It filters events based on position information and reflection characteristics, allowing complete yet clean data to reach the measurement system without introducing information loss
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 solution effectively suppresses the influence of disturbance light and irradiation light, allowing for accurate shape measurement by removing unnecessary events and interpolating valid data, resulting in precise shape measurement.
Implementation Method 1
an imaging section in which pixels that photoelectrically convert entering light reflected from a measurement object are arranged, the imaging section detecting that amounts of change in luminance of the pixels have exceeded a predetermined threshold as events
Data Source
AI summary
Provided is an imaging device that includes an imaging section in which pixels that photoelectrically convert entering light reflected from a measurement object are arranged, the imaging section detecting that amounts of change in luminance of the pixels have exceeded a predetermined threshold as events, and an event suppression section that removes an event having position information outside a range of an upper limit setting value and a lower limit setting value of an expected position from among the events detected by the imaging section as an unnecessary event.