Event-Camera Optical Positioning With Low Data Processing Load
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Solution Overview
Problem
Existing optical marker systems require high process performance information processing devices to estimate camera position due to the large amount of data generated by frame-based cameras.
Innovation Solution
An optical wireless communication system using an event camera and multiple light sources to transmit position specifying information, allowing the system to estimate camera position and orientation with reduced data processing requirements by utilizing event-based data output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a frame-based camera is used to capture images for position estimation, then the camera can obtain comprehensive image data, but the data amount becomes large requiring high process performance information processing devices
Solution Approach 1:
The invention extracts only the essential information needed for position estimation by using event cameras that detect and output only pixels with luminance changes. This extracts the critical motion-related data while discarding redundant static information, thereby reducing data amount without compromising position estimation accuracy
Solution Approach 2:
The invention changes the data output parameter from frame-based continuous images to event-based discrete signals. Event cameras output data only when luminance changes exceed a threshold, fundamentally changing the data representation parameter from comprehensive frame data to selective event data, reducing processing requirements
2Loss of information
If frame-based cameras output image data at predetermined frame rates, then continuous visual information is captured, but the data processing load increases significantly
Solution Approach 1:
The invention replaces continuous periodic frame capture with event-triggered periodic output. Instead of capturing all frames at fixed intervals, the system outputs data periodically only when luminance changes occur, maintaining essential visual information while improving processing efficiency through selective periodic output
Solution Approach 2:
The invention uses partial action by capturing only the necessary portion of visual information - specifically, only pixels with significant luminance changes. This partial capture approach maintains sufficient information for position estimation while dramatically reducing the total data volume requiring processing
Data Source
AI summary
An optical wireless communication system includes a plurality of light sources, a receiving device including an event camera, and an information processing device. Each light source transmits an optical signal. The receiving device receives the optical signal through the event camera. The optical signal includes position specifying information, for specifying a position of a transmission source of the optical signal in an absolute coordinate system. The information processing device estimates a position and an orientation of the event camera in an absolute coordinate system, using a light source image position and a light source absolute position.