Trajectory Calculation Using Non-Synchronized Cameras
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Solution Overview
Problem
Existing trajectory calculation devices require synchronized cameras and fixed camera positions, limiting their application in dynamic environments like outdoor events, as they need high-performance equipment for synchronization and restricted camera placement.
Innovation Solution
A trajectory calculation device and method that calculates a moving body's trajectory in three-dimensional space using non-synchronized cameras, allowing for flexible camera placement by detecting two-dimensional positions and calculating three-dimensional trajectories without the need for synchronization or high-performance equipment, using two-dimensional position, existence plane, and three-dimensional trajectory calculation units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronized cameras are used to calculate three-dimensional position, then measurement precision is improved, but device complexity increases and camera placement freedom is restricted
Solution Approach 1:
The patent extracts the synchronization requirement from the camera system by using independently recordable timestamps on video data. Each camera operates autonomously without needing complex synchronization hardware or software, yet the system can still calculate three-dimensional positions by correlating video frames based on their timestamps and the moving body's motion continuity.
Solution Approach 2:
The patent replaces the mechanical/electrical synchronization system with an information-based approach using timestamps and motion analysis. Instead of synchronizing cameras through cables or control signals, the system uses temporal information (timestamps) and spatial information (moving body position continuity) to achieve the same goal without complex hardware.
2Measurement precision
If synchronized cameras with cables are used, then measurement precision is improved, but ease of operation deteriorates due to restricted camera placement
Solution Approach 1:
The patent makes the camera system dynamic and adaptable by allowing cameras to be placed freely without fixed positioning requirements. The system dynamically selects appropriate video frames from different cameras based on timestamps and motion analysis, enabling flexible camera placement while maintaining measurement accuracy for moving body trajectory calculation.
3Measurement precision
If fixed camera positions are used, then measurement precision is improved, but adaptability deteriorates in dynamic environments
Solution Approach 1:
The patent changes the approach from fixed camera positions to variable camera placements by introducing timestamp-based frame selection and motion continuity analysis. The system can adapt to different camera positions and environments by using temporal and spatial parameters to identify corresponding frames, making it versatile for various dynamic environments while maintaining calculation accuracy.
Data Source
AI summary
In the case where a three-dimensional position of a moving body is calculated based on image data taken by a plurality of cameras that are synchronized, high performance equipment and system such as a system to make the synchronization among the plurality of cameras and a camera having a built-in function to make the synchronization are required. It is also required to fix the camera position with high accuracy beforehand. It is made possible to calculate a trajectory of a moving body as a target in the three-dimensional space using image data taken by a plurality of cameras that are non-synchronized mutually, thereby solving the above issue. And positions of respective cameras are calculated in the three-dimensional space from a plurality of reference points having fixed position coordinates in the three-dimensional space that are commonly shown in the image data of the respective cameras, thereby solving the above issue.