Image 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 and encodes this ratio in a neural-network post-filter characteristics (NNPFC) supplemental enhancement information (SEI) message, allowing adaptive determination of the output picture size based on signaled size information.
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 ratio information (numerator and denominator values) in the NNPFC SEI message rather than transmitting complete picture data, enabling efficient representation of output picture dimensions while maintaining quality
Solution Approach 2:
The patent changes the parameter representation by using a ratio-based approach (numerator/denominator) to define picture size relationships, allowing flexible scaling between input and output pictures while reducing the amount of size information that needs to be transmitted
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) and transmits them in the NNPFC SEI message, avoiding transmission of redundant information while preserving the ability to reconstruct output picture dimensions accurately
Solution Approach 2:
Instead of transmitting complete picture data or detailed size information, the patent inverts the approach by transmitting only the ratio parameters that define the relationship between input and output pictures, allowing the receiver to derive actual dimensions as needed
Data Source
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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.