Bitstream Size Signaling for Adaptive Output Picture Scaling
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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 high-efficient image compression technology.
Innovation Solution
An image encoding/decoding method that determines a ratio between the size of an output picture and an input picture, encoding this ratio in a neural-network post-filter characteristics (NNPFC) supplemental enhancement information (SEI) message, and signaling size information to adaptively determine the output picture size.
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 extracts and transmits only the essential size information (numerator and denominator values) needed to define output picture dimensions, rather than transmitting complete high-resolution image data. This selective extraction enables quality images to be reconstructed with reduced transmission requirements.
Solution Approach 2:
The patent changes the representation of picture size from absolute pixel dimensions to a ratio parameter (numerator/denominator). This parameter transformation allows flexible scaling of image quality while maintaining efficient transmission, as the same ratio can represent multiple resolution levels.
2Manufacturing precision
If the amount of transmitted information increases, then image quality is improved, but transmission cost increases
Solution Approach 1:
The patent extracts only the critical size ratio parameters (numerator and denominator) from the full image data, transmitting minimal information necessary to reconstruct images at desired quality levels, thereby reducing transmission energy requirements.
Solution Approach 2:
The transmitted size information serves multiple functions: it defines output picture dimensions, enables adaptive scaling, and allows flexible quality adjustment without requiring separate transmission for each resolution level, reducing overall transmission costs.
3Measurement precision
If size information is explicitly transmitted for each picture, then output picture size accuracy is improved, but bitstream complexity increases
Solution Approach 1:
The patent transforms picture size representation from absolute values to a ratio parameter system (numerator/denominator), maintaining precise size control while reducing the number of bits required to encode size information compared to transmitting full dimension values for each picture.
Solution Approach 2:
Instead of transmitting detailed size information and having the decoder interpret it, the patent inverts the approach by transmitting compact ratio parameters that directly define size relationships, simplifying the bitstream while preserving size accuracy through the ratio representation.
Data Source
AI summary
An image encoding/decoding method, a bitstream transmission method, and a computer-readable recording medium for storing a bitstream are provided. The image decoding method according to the present disclosure is an image decoding method performed by an image decoding device, and may be an image decoding method comprising the steps of: obtaining size information from a neural-network post-filter characteristics (NNPFC) supplemental enhancement information (SEI) message; and determining the size of an output picture on the basis of the size information, wherein the size information comprises information on the numerator value of the ratio between the size of the output picture and the size of an input picture and information on the denominator value of the ratio.