Multi-Camera Clock Synchronization Using FMCW Ranging
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Solution Overview
Problem
Existing methods for synchronizing clock times across multiple imaging apparatuses, such as genlock and time code synchronization, struggle with latency issues and require physical connection, making it difficult to automatically synchronize clock times without visual adjustments.
Innovation Solution
Utilizing frequency modulated continuous wave (FMCW) ranging apparatuses to synchronize clock times based on speed information from ranging information of moving objects, including a system with a relative attitude detector, viewpoint transformation processor, and clock-time corrector to align clock times across multiple imaging apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If genlock signal or time code synchronization is shared to match scanning timings of multiple imaging apparatuses, then clock time synchronization is achieved, but transmission delays (latencies) cannot be automatically compensated and physical connections are required
Solution Approach 1:
The patent replaces the mechanical/physical connection system (genlock cables, time code synchronization wires) with an optical-based FMCW ranging system. By using light propagation time measurements between imaging apparatuses, clock synchronization is achieved without physical synchronization connections, eliminating the need for genlock signal sharing while maintaining synchronization precision.
Solution Approach 2:
The patent introduces a light wave as an intermediary medium to carry timing information. The FMCW ranging apparatus uses modulated light to measure distance and transmission delay, which serves as the basis for calculating clock offset. This intermediary approach allows indirect synchronization without direct physical connection between clock systems.
2Measurement precision
If genlock signal is used to synchronize scanning timings, then clock times are synchronized, but transmission delays during image transmission cannot be automatically compensated
Solution Approach 1:
The patent implements a feedback mechanism where the FMCW ranging apparatus continuously measures the transmission delay between imaging apparatuses, and this measured delay information is fed back to the synchronization control system. The system automatically adjusts clock timing based on the real-time delay measurements, compensating for transmission variations without manual intervention.
Solution Approach 2:
The patent performs preliminary measurement of transmission delays using FMCW ranging before image transmission occurs. By knowing the transmission delay in advance through light propagation time measurement, the system can pre-calculate the required clock offset compensation, ensuring synchronized image capture without waiting for actual transmission delays to manifest.
3Adaptability or versatility
If multiple imaging apparatuses are used to capture images of the same object, then wider area coverage or redundancy is achieved, but clock time synchronization becomes difficult without physical connections
Solution Approach 1:
The patent enables each imaging apparatus to autonomously participate in the synchronization process by equipping them with FMCW ranging capabilities. Each apparatus independently measures its own transmission delay to the reference apparatus using light propagation time, and automatically adjusts its clock accordingly. This self-service approach eliminates the need for complex centralized synchronization setup and physical connections between all apparatuses.
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
Achieves precise synchronization of clock times across multiple imaging apparatuses, enabling seamless integration of captured images and generation of accurate three-dimensional models without the need for physical connections or visual adjustments.
Implementation Method 1
The FMCW-LiDAR is able to measure a speed of an object by the Doppler effect as well as a distance to the object.
Data Source
AI summary
[Object]To more exactly synchronize clock times of a plurality of imaging apparatuses.[Solving Means]An information processing apparatus configured to synchronize, on the basis of speed information included in respective pieces of ranging information regarding moving objects corresponding to each other measured by a plurality of imaging apparatuses with use of light subjected to frequency continuous modulation, respective clock times of the plurality of imaging apparatuses.