Image Decoding Layer Mapping for Leaner Resolution Signaling
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Solution Overview
Problem
The existing methods for mapping enhancement layers and resolution information in image coding schemes like HEVC are insufficient, leading to inefficiencies in bitstream processing and increased communication overhead due to redundant information exchange.
Innovation Solution
The proposed solution enhances the mapping between enhancement layers and resolution information by allowing flexible mapping and reducing redundant information transfer through improved syntax structures in VPS_EXT and SPS, enabling more efficient bitstream processing and session negotiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional mapping methods using flags and relationship descriptions are used between enhancement layers and resolution information, then the mapping can be established, but the bitstream size increases and communication overhead is increased due to redundant information
Solution Approach 1:
The patent extracts only the necessary mapping information between enhancement layers and resolution formats, removing redundant flag descriptions and relationship definitions. Instead of transmitting complete mapping tables and flags, the system transmits only the essential layer-to-format correspondence, significantly reducing bitstream size while maintaining mapping functionality.
Solution Approach 2:
The patent inverts the traditional approach by having the resolution format information point to the enhancement layer rather than having each layer explicitly describe its mapping. This inversion allows the system to derive mapping relationships from the format side, reducing the need for redundant layer-side descriptions and flags.
2Reliability
If detailed mapping information is transmitted for each enhancement layer, then accurate mapping can be achieved, but communication bandwidth is wasted due to redundant data transfer
Solution Approach 1:
The patent merges the mapping information transmission into the resolution format description rather than treating it as a separate layer attribute. By combining the format identification with the layer mapping relationship, the system eliminates redundant transmissions while ensuring accurate mapping information is conveyed.
Solution Approach 2:
The patent enables the resolution format information to self-describe its mapping relationship with enhancement layers through the rep_format_idx field. Instead of requiring external flag descriptions from each layer, the format information inherently contains the mapping relationship, allowing the system to derive accurate mappings without additional overhead.
Data Source
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AI summary
There is provided an image decoding apparatus comprising circuitry configured to extract, from a bitstream generated by coding an image, information relating to a correspondence relationship between resolution information and an enhancement layer, wherein the correspondence information is set in a case where the number of the layers is greater than the number of multiple candidates for the resolution information on a layer of the image; and decode the bitstream using the extracted information relating to the correspondence relationship between the resolution information and the enhancement layer.