Video Slice Height Signaling to Reduce Bitstream Overhead
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality images/videos, especially in virtual reality and augmented reality, leads to higher transmission and storage costs due to increased data volume, necessitating more efficient image/video compression techniques.
Innovation Solution
A method and apparatus for enhancing coding efficiency by efficiently signaling information related to slices within a tile, reducing signaling overhead, and optimizing the number and height of slices within a tile, particularly when multiple slices have the same height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution and high quality image/video are transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting compression parameters including slice configuration, transform block sizes, and quantization parameters to optimize the balance between image quality and data volume. By changing these parameters adaptively, the system achieves high quality transmission while controlling the amount of data required.
2Manufacturing precision
If more slices are signaled within a tile, then coding precision is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial action by signaling slice information selectively rather than for all slices. When multiple slices have identical heights, the patent signals the height information only once and derives it for other slices, rather than explicitly signaling each slice's height separately. This reduces signaling overhead while maintaining the precision needed for accurate slice configuration.
3Measurement precision
If explicit height information is signaled for each slice, then slice configuration accuracy is improved, but bitstream size increases
Solution Approach 1:
The patent uses copying by deriving slice height information from previously signaled slice heights rather than copying (repeating) the full height information for each slice. When slices have the same height, the system copies the height value from a reference slice through derivation, significantly reducing the number of bits required in the bitstream while maintaining accurate slice configuration.
Data Source
AI summary
A method by which a video decoding device decodes a video, according to the present document, can comprise the steps of: parsing, from a bitstream, number information related to the number of slices of which the height within a tile of a current picture is explicitly signaled; parsing, from the bitstream, on the basis of the number information, height information related to the height of the slices of which the height is explicitly signaled; deriving the number of slices in the tile on the basis of the number information and the height information; generating prediction samples by predicting the current block of the current picture on the basis of the slices within the tile; generating reconstructed samples on the basis of the prediction samples; and generating a reconstructed picture for the current picture on the basis of the reconstructed samples.