OLS DPB Parameter Indexing for Efficient Image Decoding
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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 large amount of information required, necessitating a more efficient image compression technique.
Innovation Solution
The method and apparatus provide a way to derive and signal Decoded Picture Buffer (DPB) parameters for an Output Layer Set (OLS), allowing adaptive updating of DPB to improve overall coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality image data is transmitted or stored using conventional methods, then image quality is maintained, but transmission cost and storage cost increase significantly
Solution Approach 1:
The patent changes the parameter representation by introducing OLS DPB parameter indices that reference pre-defined DPB parameter sets. Instead of transmitting complete DPB parameter information for each layer, the system transmits compact index values that point to parameter sets defined at the OLS level, thereby reducing the bitrate while maintaining the ability to represent high-quality image data
Solution Approach 2:
The patent creates a reference mechanism where DPB parameter sets are defined once at the OLS level and then copied/referenced by individual layers through indices. This allows multiple layers to share common DPB parameters without redundant transmission, reducing overall bitrate while preserving image quality through consistent parameter application across layers
2Adaptability or versatility
If DPB parameters are signaled for each layer individually, then layer-specific control is achieved, but signaling overhead and device complexity increase
Solution Approach 1:
The patent segments DPB parameter management into two distinct levels: OLS-level parameter sets (defined once) and layer-level parameter selection (via indices). This segmentation allows the system to maintain detailed layer-specific control where needed while using compact index references to reduce signaling overhead, effectively dividing the parameter management task between shared and layer-specific components
Solution Approach 2:
The patent creates universal DPB parameter sets at the OLS level that can be referenced by multiple layers. These parameter sets serve multiple functions: they define default parameters for all layers, provide a basis for layer-specific customization through index selection, and enable efficient bitrate usage through shared representation. The same parameter set can be universally applied across different layers or selectively overridden where layer-specific control is required
Data Source
AI summary
An image decoding method performed by a decoding apparatus according to the present document comprises the steps of: obtaining image information; performing a picture management process for pictures of a decoded picture buffer (DPB) on the basis of the image information; and decoding a current picture on the basis of the pictures, wherein the image information includes an output layer set (OLS) DPB parameter index for a target OLS, and the picture management process is performed on the basis of DPB parameter information for the target OLS derived on the basis of the OLS DPB parameter index.