Video Transmission Apparatus Error Propagation Control
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Solution Overview
Problem
Existing data transmission methods for coded video contents face challenges in controlling the code amount during error propagation, leading to increased communication line tension, delayed transfers, and degraded image quality, especially when the communication path capacity is limited.
Innovation Solution
A transmission apparatus that receives error information, changes the coding mode by referencing other frames, and codes video data without relying on the frame with errors, thereby minimizing the number of frames affected by errors without significantly increasing the code amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coding mode is forcibly changed to intra-coding mode based on error information, then error propagation is decreased, but the code amount is abruptly increased
Solution Approach 1:
The patent applies local quality by changing the coding mode from inter-coding to intra-coding only for specific macroblocks affected by errors, rather than changing the coding mode for the entire frame. This selective approach limits the code amount increase to only the necessary regions while still effectively stopping error propagation in the affected areas.
Solution Approach 2:
The patent segments the frame into multiple macroblocks and identifies which specific macroblocks are affected by errors. By processing only the affected macroblocks rather than the entire frame, the system reduces the overall code amount increase while maintaining effective error correction.
2Reliability
If the coding mode is forcibly changed to intra-coding mode, then error propagation is stopped, but the communication line is tightened causing delayed transfers and data losses
Solution Approach 1:
By applying intra-coding mode only to affected macroblocks rather than the entire frame, the patent reduces the total code amount increase, which in turn reduces the transmission burden on the communication line and minimizes delays and data losses while still effectively stopping error propagation.
3Reliability
If the coding mode is forcibly changed to intra-coding mode, then error propagation is decreased, but the code amount distribution to frames is decreased significantly degrading image quality
Solution Approach 1:
The patent maintains image quality by applying intra-coding mode only to the specific macroblocks that are actually affected by errors, rather than applying it to the entire frame. This preserves the inter-coding mode for unaffected regions, maintaining efficient code distribution and image quality while still providing effective error correction where needed.
Data Source
AI summary
A transmission apparatus receives information used to identify video data in which an error occurs on a communication path, and changes a coding mode in which data coding is performed by referring to video data in other frame so that video data coded by referring to the video data corresponding to the identification information is coded in a coding mode in which data coding is performed without referring to the video data in the other frame. Further, the transmission apparatus codes video data in the changed coding mode.