Optical Marker Displacement Estimation for High-Frequency Motion
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Solution Overview
Problem
Current methods for estimating displacements of objects with high frequency motions are limited by the need for physical contact, which can be challenging to maintain and reduces precision, and high-speed cameras required for accurate measurements are expensive and computationally intensive.
Innovation Solution
An image processing-based method using an optical marker with a plurality of optical sources excited in a predefined pattern, allowing displacement estimation through capturing and processing images with conventional imaging devices, enabling displacement sequence extraction without physical contact and reducing the need for high-speed cameras.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-speed cameras are used to capture images with small exposure times for high frequency motion displacement estimation, then measurement precision is improved, but device cost and computational complexity increase significantly
Solution Approach 1:
The optical marker is segmented into multiple independently controllable optical sources arranged in specific patterns. By selectively exciting different subsets of these optical sources at different time intervals within a single exposure period, the system creates multiple distinct optical marks that encode high-frequency displacement information. This segmentation allows conventional cameras to capture high-frequency motion without requiring high-speed camera hardware.
Solution Approach 2:
The optical sources are excited in periodic patterns with specific time intervals that correspond to the high-frequency motion being measured. Multiple optical sources are activated sequentially at different time points within one camera exposure time, creating a periodic excitation pattern that encodes the displacement information. This periodic action enables the system to measure high-frequency motions using conventional imaging devices with lower frame rates.
2Measurement precision
If physical contact measurement instruments are used to measure displacement of moving objects, then measurement precision can be maintained, but maintaining physical contact becomes challenging for objects with large movement ranges
Solution Approach 1:
The patent replaces mechanical contact-based measurement instruments with an optical measurement system. Instead of using physical probes that must maintain contact with the object, the system uses optical markers with multiple light sources that can be excited and detected remotely by conventional cameras. This substitution eliminates the need for physical contact while maintaining measurement precision, allowing the system to track objects with large movement ranges without mechanical constraints.
3Device complexity
If conventional imaging devices are used for displacement estimation, then device cost is reduced, but the ability to capture high frequency motions accurately is limited by exposure time
Solution Approach 1:
The optical sources are excited at predetermined time intervals before the camera exposure is complete. By strategically timing the excitation of different optical sources during the exposure period, the system ensures that each source creates a distinct optical mark at a known time point. This preliminary action of exciting sources at specific moments allows the reconstruction of high-frequency displacement information from a single exposure, overcoming the limitation of conventional imaging devices.
Solution Approach 2:
The patent adds a temporal dimension to the spatial arrangement of optical sources. By exciting different optical sources at different time intervals within a single exposure, the system encodes time information into the spatial distribution of optical marks. This dimensionality change allows conventional cameras to capture high-frequency motion data by utilizing the time-varying excitation pattern of multiple optical sources, effectively transforming a temporal measurement problem into a spatial analysis problem.
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 method allows for accurate displacement estimation of high-frequency motions using conventional imaging devices, reducing costs and computational complexity while maintaining precision, and enabling displacement estimation in a shorter time frame than the exposure time of the imaging device.
Implementation Method 1
mounting an optical marker on the object, exciting a plurality of optical sources of the optical marker
Data Source
AI summary
A method for estimating a displacement sequence of an object. The method includes mounting an optical marker on the object, exciting a plurality of optical sources of the optical marker, capturing a plurality of images, and extracting the displacement sequence from a first image of the plurality of images and a second image of the plurality of images. The plurality of optical sources are excited utilizing one or more processors. The plurality of optical sources are excited based on an excitation pattern. The plurality of images are captured utilizing an imaging device. The displacement sequence is extracted utilizing the one or more processors. The displacement sequence is associated with the excitation pattern.