Error Resilient Video Transmission via Reference Frame Indicators
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Solution Overview
Problem
Existing video communication systems face challenges in error resilience and random access, particularly in packet-based networks, due to heavy compression and temporal dependencies in video data, which lead to significant delays and bandwidth overhead in error recovery processes.
Innovation Solution
The system designates a set of video frames for reliable delivery, using techniques like retransmission and secure links, and employs LRP modules to detect lost frames, enabling minimal delay corrective actions, compatible with scalable and single-layer video coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If video data is heavily compressed to conserve bandwidth, then bandwidth efficiency is improved, but error resilience deteriorates due to strong temporal dependencies between sequential video packets
Solution Approach 1:
The patent applies preliminary action by proactively inserting reference frame indicators and synchronization markers into the video bitstream before transmission. These markers are placed in advance to enable the receiver to quickly identify and recover from packet losses without waiting for error propagation to occur, thus maintaining error resilience while using heavy compression.
Solution Approach 2:
The patent uses reference frame indicators and synchronization markers as intermediary elements that mediate between the compressed video data and the receiver's decoding process. These intermediaries provide structural guidance to the receiver, enabling it to reconstruct the video sequence correctly even when packets are lost, thus resolving the contradiction between compression efficiency and error resilience.
2Reliability
If retransmission techniques are used to achieve error resilience, then reliability is improved, but end-to-end delay increases which is unacceptable for interactive videoconferencing
Solution Approach 1:
The patent applies preliminary action by pre-positioning reference frame indicators and synchronization markers in the transmitted bitstream. This allows the receiver to proactively detect packet losses and initiate recovery procedures immediately upon detecting a missing reference frame, rather than waiting for error propagation to manifest, thus reducing end-to-end delay while maintaining reliability.
Solution Approach 2:
The patent enables the receiver to skip ahead to the next available reference frame when packet losses are detected, rather than waiting for retransmission. This rushing through mechanism allows the system to bypass delayed retransmission and quickly recover from errors using locally available reference frames, significantly reducing end-to-end delay.
3Reliability
If random access points are frequently inserted to support error recovery, then error resilience is improved, but compression efficiency deteriorates due to increased bandwidth overhead
Solution Approach 1:
The patent applies local quality by selectively inserting reference frame indicators and synchronization markers only at critical points in the video bitstream where they are most needed for error recovery. Rather than uniformly distributing reference frames throughout the sequence, the system places them locally at strategic positions based on temporal dependencies and potential error propagation points, thus improving error recovery capability while minimizing bandwidth overhead.
Data Source
AI summary
Systems and methods for error resilient transmission and for random access in video communication systems are provided. The video communication systems are based on single-layer, scalable video, or simulcast video coding with temporal scalability, which may be used in video communication systems. A set of video frames or pictures in a video signal transmission is designated for reliable or guaranteed delivery to receivers using secure or high reliability links, or by retransmission techniques. The reliably-delivered video frames are used as reference pictures for resynchronization of receivers with the transmitted video signal after error incidence and for random access.