Tile Slice Height Signaling for Efficient Image and Video Coding
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality images and videos, particularly in virtual reality and augmented reality, leads to higher data transmission and storage costs due to the increased amount of information required, necessitating a more efficient compression technique.
Innovation Solution
A method and apparatus for coding images/videos that involve parsing and encoding/decoding information on slices within a tile, where the height of each slice is explicitly signaled, allowing derivation of slice heights based on a fixed number of syntax elements, reducing redundant signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the height of each slice is explicitly signaled in the bitstream, then the decoding accuracy and reliability are improved, but the signaling overhead and data transmission size increase
Solution Approach 1:
Instead of explicitly signaling the height of all slices, the patent signals the height of only the first slice and uses this information to derive the heights of subsequent slices. This partial signaling approach maintains decoding reliability while significantly reducing the total signaling overhead required in the bitstream.
Solution Approach 2:
The patent employs a self-service mechanism where the height information of the first slice serves as a reference to automatically derive the heights of other slices within the same tile. This eliminates the need for redundant explicit signaling of slice heights for all slices, thereby reducing overhead while maintaining accuracy.
2Manufacturing precision
If the number of slices and their heights are fully signaled, then the picture decoding precision is improved, but the compression efficiency decreases due to increased data size
Solution Approach 1:
The patent applies partial action by signaling only the necessary height information (first slice height) and using it to derive other slice heights. This approach maintains sufficient decoding precision while reducing the data size, thereby improving compression efficiency.
Solution Approach 2:
The patent changes the parameter representation from explicit full signaling of all slice heights to a derived parameter system where the first slice height serves as a reference parameter to calculate subsequent slice heights. This parameter change reduces the bitstream size while maintaining decoding precision.
3Measurement precision
If explicit height signaling is used for all slices, then the slice information accuracy is improved, but the transmission cost and storage requirements increase
Solution Approach 1:
The patent implements a self-service mechanism where the first slice's height information serves as a reference to derive the heights of subsequent slices. This reduces the total quantity of data that needs to be transmitted and stored while maintaining accurate slice information through the derivation process.
Solution Approach 2:
The patent discards redundant explicit height signaling for slices beyond the first one, and recovers the necessary height information through derivation based on the first slice's height and the total number of slices. This reduces data volume while preserving measurement precision.
Data Source
AI summary
A video decoding method performed by a video decoding apparatus according to the present document comprises: parsing number information about the number of slices for which height is explicitly signaled in a tile of a current picture from a bitstream; parsing height information about the height of the slices for which height is explicitly signaled from the bitstream based on the number information; and decoding the current picture based on the number information and the height information.