Dynamic Light Emission and Imaging Synchronization for Mobile VLC
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Solution Overview
Problem
Existing visible light communication systems face challenges in efficiently transmitting data between mobile devices and imaging apparatuses, particularly in adapting to the movement of mobile devices, which affects the light emission and imaging intervals, leading to inefficiencies in data capture and processing.
Innovation Solution
A system comprising a light-emitting apparatus with a movement detector and light emission controller, and an imaging apparatus with a movement detector and imaging interval controller, which modulate light emission and imaging intervals based on detected movement to optimize data transmission and capture, using specific light emission patterns for different speeds of mobile devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light emission interval is fixed and the imaging interval is fixed, then the system structure is simple, but the system cannot adapt to mobile device movement, leading to missed data capture and reduced transmission reliability
Solution Approach 1:
The patent implements dynamic adjustment of both light emission intervals and imaging intervals based on detected movement characteristics. The light emission apparatus changes its emission timing according to movement speed, while the imaging apparatus synchronizes its capture intervals to match, ensuring reliable data transmission during mobile operation without requiring overly complex predictive control systems
Solution Approach 2:
The system employs feedback mechanisms where movement detectors continuously monitor position changes, and this information feeds back to controllers that adjust subsequent light emission and imaging intervals. This closed-loop control ensures adaptation to varying movement conditions while maintaining system reliability
2Reliability
If the light emission interval is shortened to capture fast movement, then the data capture reliability is improved, but the energy consumption increases
Solution Approach 1:
The light emission interval is dynamically adjusted based on detected movement speed. During fast movement, the interval shortens to ensure position capture reliability. During slow or stationary periods, the interval extends to reduce energy consumption, achieving optimal balance between reliability and power efficiency
Solution Approach 2:
The system changes the temporal parameter (emission interval) of light based on movement conditions. By varying this parameter according to actual needs rather than maintaining a fixed interval, the system achieves reliable capture during critical moments while conserving energy during stable periods
3Reliability
If the imaging interval is shortened to capture fast movement, then the position capture reliability is improved, but the processing burden and power consumption increase
Solution Approach 1:
The imaging interval is dynamically synchronized with light emission intervals and adjusted based on movement detection. During fast movement, shorter intervals ensure reliable position capture. During slow movement or stationary states, longer intervals reduce processing burden and power consumption of the imaging apparatus
4Reliability
If synchronized control of light emission and imaging is implemented, then data transmission reliability is improved, but the system complexity increases
Solution Approach 1:
The system uses feedback from movement detectors to synchronize light emission and imaging operations. Both apparatuses respond to the same movement input signals, ensuring their intervals remain coordinated without requiring complex inter-apparatus communication or centralized control
Solution Approach 2:
The synchronization mechanism serves multiple functions: coordinating emission timing, coordinating imaging timing, and adapting both to movement conditions. This multi-functional approach reduces overall system complexity compared to separate independent control systems
Data Source
AI summary
To easily capture the light emission position of a light-emitting apparatus on the imaging apparatus side, even when the positional relationship of the two changes. A mobile device detects its own speed, and an LED within the mobile device accomplishes light emission in accordance with any out of a first light emission pattern, a second light emission pattern and a third light emission pattern so that the light emission cycle becomes shorter the faster the speed of the mobile device. On the other hand, a server detects the speed of the mobile device from frames obtained through imaging by an imager, and changes the imaging interval of the imager so that the imaging interval becomes longer the slower the speed.