Entry Point Headers for Adaptive Video Coding Control
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Solution Overview
Problem
Current video compression and decompression techniques are inflexible and inefficient, particularly in handling interlaced video frames and varying coding parameters, leading to increased bit rate and complexity in implementing trick modes.
Innovation Solution
The implementation of entry point segments with control parameters in a video bitstream, allowing for flexible encoding and decoding decisions, such as pan scan, loop filtering, and motion compensation, within an entry point layer, enabling efficient random access and improved trick mode processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If video compression uses fixed coding parameters across the entire bitstream, then implementation is simpler, but compression efficiency decreases and bit rate increases
Solution Approach 1:
The patent divides the video bitstream into multiple entry point segments, each with its own set of coding parameters. This allows different parameter sets to be applied to different segments independently, enabling adaptive compression without requiring complex signaling for the entire bitstream. The segmentation resolves the contradiction by localizing parameter changes to specific segments rather than applying them globally.
Solution Approach 2:
The patent places entry point headers with coding parameters at the beginning of each entry point segment, before the actual video data. This preliminary action allows the decoder to configure itself with the appropriate parameters before processing the segment, eliminating the need for continuous parameter signaling throughout the bitstream and reducing overall complexity while maintaining adaptability.
2Adaptability or versatility
If trick modes are implemented with complex parameter handling, then processing capability improves, but bit rate and system complexity increase
Solution Approach 1:
The patent applies different coding parameters locally to specific entry point segments rather than uniformly across the entire bitstream. This allows trick mode processing to be enabled or disabled selectively in different segments, providing enhanced processing capability where needed while avoiding unnecessary bit rate increases in segments where simple compression suffices.
Solution Approach 2:
The patent makes the coding parameters dynamic by allowing them to change at each entry point header, enabling the system to adaptively adjust compression settings based on the specific requirements of each segment. This dynamic approach supports trick mode processing capability while controlling bit rate by only applying enhanced processing where necessary.
3Productivity
If random access is implemented without entry point segments, then system structure is simpler, but access efficiency and trick mode performance deteriorate
Solution Approach 1:
The patent segments the bitstream into independently decodable entry point segments, each marked by an entry point header. This segmentation enables efficient random access by allowing the decoder to jump directly to any entry point and begin decoding without processing previous segments, significantly improving access efficiency. The segmented structure adds minimal complexity compared to the alternative of requiring full bitstream processing for random access.
Data Source
AI summary
A decoder receives an entry point header comprising plural control parameters for an entry point segment corresponding to the entry point header. The entry point header is in an entry point layer of a bitstream comprising plural layers. The decoder decodes the entry point header. The plural control parameters can include various combinations of control parameters such as a pan scan on/off parameter, a reference frame distance on/off parameter, a loop filtering on/off parameter, a fast chroma motion compensation on/off parameter, an extended range motion vector on/off parameter, a variable sized transform on/off parameter, an overlapped transform on/off parameter, a quantization decision parameter, and an extended differential motion vector coding on/off parameter, a broken link parameter, a closed entry parameter, one or more coded picture size parameters, one or more range mapping parameters, a hypothetical reference decoder buffer parameter, and/or other parameter(s).