Vehicle Video Stream Timestamping for Precise Network Lag Detection
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Solution Overview
Problem
Current video stream transmission systems in autonomous motor vehicles suffer from significant transmission delays due to network lag, making precise control and safety monitoring challenging, as existing methods only provide an estimate of the delay and not a precise determination.
Innovation Solution
An electronic device with a timestamper producing timestamping signals is integrated into the transmission system, allowing for the creation of a multiplexed signal that includes video and timestamping information, enabling precise calculation of transmission time and lag determination, and is synchronized with a reference server using NTP protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video stream is transmitted via communication network, then remote monitoring capability is provided, but transmission delay increases making precise control difficult
Solution Approach 1:
The system embeds timestamps in advance within the video stream data packets before transmission. This preliminary action allows the receiving end to calculate transmission delay immediately upon receipt by comparing the timestamp with the current time, without requiring additional measurement transactions that would further increase delay.
2Loss of information
If sending time is displayed on video images, then estimate of transmission delay is provided, but precise determination of delay is not achieved
Solution Approach 1:
The patent introduces an intermediary timestamp value embedded within the video data stream itself. This timestamp acts as a mediator between the sending and receiving ends, carrying precise time information that enables accurate delay calculation without requiring direct communication or additional measurement transactions between the two ends.
3Measurement precision
If timestamping signal is multiplexed with video signal, then precise lag determination is enabled, but device complexity increases
Solution Approach 1:
The timestamping function is merged with the existing video encoding and transmission infrastructure. The timestamp is combined with the video signal into a single multiplexed stream using standard multiplexing techniques, allowing precise delay measurement to be achieved without adding separate independent measurement devices or complex additional hardware systems.
Data Source
AI summary
An electronic device is for transmitting a video stream, and is able to be embedded in an autonomous motor vehicle. The electronic device includes a convertor for converting the video stream into a video signal transmissible via a transmission channel and a transmitter configured to send, to a monitoring device outside the vehicle, via the transmission channel, a signal for escalating information including said video signal. The electronic transmission device also includes a timestamper configured to repeatedly produce a timestamping signal including at least one piece of information relative to the production date of said timestamping signal. The information escalation signal includes the timestamping signal.