DPB Parameter Signaling for Shorter Video Bitstreams
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in transmission and storage costs due to the rise in the amount of transmitted information or bits, necessitating improved image compression technology.
Innovation Solution
An image encoding/decoding method and apparatus that efficiently signals information on the number of decoded picture buffer (DPB) parameters, managing DPB based on computed DPB parameter syntax structures, and transmitting a bitstream generated by the encoding method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent segments the DPB parameter information into multiple syntax structures (dpb_parameters syntax structure) that can be selectively signaled. By dividing the parameter signaling into manageable units indexed by vps_num_dpb_params, the system can transmit only the necessary parameter sets for high-quality decoding without transmitting redundant information, thus maintaining image quality while reducing transmission volume.
Solution Approach 2:
The patent changes the parameter signaling approach by introducing variable-length syntax structures for DPB parameters. The vps_num_dpb_params indicator allows dynamic adjustment of how many DPB parameter syntax structures are transmitted, enabling the system to adapt the transmission amount to the actual quality requirements, thereby reducing unnecessary data transmission while preserving essential quality parameters.
2Measurement precision
If DPB parameter information is fully signaled, then decoding accuracy is improved, but bitstream length increases
Solution Approach 1:
The patent applies partial action by signaling only the necessary DPB parameter syntax structures rather than all possible parameters. The vps_num_dpb_params indicator enables the system to transmit a partial set of DPB parameters (from 0 to multiple syntax structures) sufficient for accurate decoding, avoiding the transmission of excessive parameter information that would increase bitstream length without providing additional decoding accuracy.
3Adaptability or versatility
If multiple DPB parameter syntax structures are transmitted, then encoding flexibility is improved, but signaling complexity increases
Solution Approach 1:
The patent prepares the encoding flexibility in advance by establishing a standardized indexed structure (vps_num_dpb_params) that defines how multiple DPB parameter syntax structures can be organized and referenced. This preliminary structuring allows the system to flexibly signal different numbers of parameter sets without requiring complex ad-hoc processing during encoding, as the framework for handling multiple syntax structures is pre-defined and systematic.
Data Source
AI summary
Disclosed herein are an image encoding and decoding method and apparatus for signaling information on the number of DPB parameters, and a recording medium storing a bitstream. An image decoding method may comprise obtaining first information indicating the number of decoded picture buffer (DPB) parameter syntax structures in a video parameter set (VPS), computing the number of DPB parameter syntax structures in the VPS based on the first information, obtaining the DPB parameter syntax structures in the VPS based on the number of DPB parameter syntax structures, and managing a DPB based on the DPB parameter syntax structures.