Transform Device for Video Stream Random Access
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Solution Overview
Problem
The existing moving image encoding process faces challenges in providing flexible services, particularly in surveillance camera systems where efficient random access and image quality are compromised due to irreversibly encoded inter-prediction pictures, leading to lag in reproduction and increased network load when trying to accommodate multiple terminals.
Innovation Solution
A transform device that acquires an irreversibly encoded stream, transforms it into a reversibly encoded stream, allowing efficient random access and reduced image quality degradation by decoding and re-encoding pictures using reversible encoding schemes like H.264 Lossless or H.265 Lossless, enabling flexible service provision without increasing network load or limiting the number of terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If inter-prediction encoding is used to compress moving images, then compression efficiency is improved, but random access efficiency deteriorates and image quality degradation occurs
Solution Approach 1:
The encoded stream is segmented into two types of pictures: irreversibly encoded inter-prediction pictures for compression and reversibly encoded pictures (inserted at regular intervals) for random access points. This segmentation allows the system to maintain compression efficiency while providing efficient entry points for random access without requiring full decoding of previous frames.
Solution Approach 2:
Reversibly encoded pictures serve as intermediary elements between the compressed inter-prediction pictures. These intermediary frames act as independent reference points that can be decoded without relying on previous frames, enabling efficient random access while the irreversibly encoded pictures maintain compression efficiency.
2Loss of energy
If irreversibly encoded inter-prediction pictures are used, then network load is reduced, but image quality deteriorates and lag occurs in reproduction
Solution Approach 1:
The video stream is segmented into irreversibly encoded pictures for normal compression and reversibly encoded pictures inserted at regular intervals. The reversible pictures preserve image quality without significant network load increase, while the irreversible pictures maintain compression efficiency.
Solution Approach 2:
The encoding parameter is changed between reversible and irreversible modes depending on the picture type. Reversibly encoded pictures use lossless or near-lossless encoding parameters to preserve image quality, while irreversibly encoded pictures use lossy compression parameters to reduce network load.
3Adaptability or versatility
If multiple terminals need to decode streams simultaneously, then service flexibility is improved, but network load increases
Solution Approach 1:
The stream is segmented with reversibly encoded pictures at regular intervals that can serve as independent decoding points. Multiple terminals can start decoding from different reversible pictures simultaneously without requiring the same bandwidth, reducing overall network load while maintaining service flexibility.
Data Source
AI summary
An acquisition unit capable of providing more flexible services includes an acquisition unit that acquires a first stream; a transformer that transforms a first picture included in the first stream into a second picture, the first picture being irreversibly encoded, the second picture being reversibly encoded; and an output unit that outputs a second stream including the second picture.