Picture Output Timing Flags for HRD Parameter Omission
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to an increase in transmission and storage costs due to the rise in the amount of transmitted information, necessitating high-efficient image compression technology.
Innovation Solution
An image encoding/decoding method and apparatus that improves encoding/decoding efficiency by signaling picture output timing information through flags specifying the presence of HRD parameters and constraining temporal distances between consecutive pictures, allowing for efficient processing of bitstreams.
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 due to increased amount of transmitted information
Solution Approach 1:
The patent extracts only the essential timing information needed for decoding by introducing a concise flag-based signaling mechanism. Instead of transmitting complete timing parameters, only a single flag indicating whether pictures are decoded in output order is transmitted, thereby reducing the amount of transmitted information while maintaining decoding accuracy.
Solution Approach 2:
The patent changes the parameter representation from detailed timing information to a simplified binary flag state. By encoding the temporal relationship between decoded pictures and output pictures as a single flag (0 or 1), the information quantity is dramatically reduced while preserving the essential timing relationship needed for image reconstruction.
2Measurement precision
If detailed HRD parameters are signaled in bitstream, then decoding accuracy is improved, but bitstream complexity and processing overhead increase
Solution Approach 1:
The patent extracts only the critical timing relationship information from the complete HRD parameter set. By identifying that the essential decoding requirement is merely the temporal order relationship between decoded and output pictures, the patent signals only this specific information through a simple flag, eliminating the need to transmit full HRD parameter sets.
Solution Approach 2:
Instead of signaling detailed parameters and having the decoder process them to derive timing information, the patent inverts the approach by directly signaling the derived timing relationship through a simple flag. This reversal simplifies the bitstream structure and reduces processing complexity while maintaining decoding accuracy.
Data Source
AI summary
An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may comprise obtaining a first flag specifying whether a network abstraction layer (NAL) hypothetical reference decoder (HRD) parameter is present in a bitstream and a second flag specifying whether a video coding layer (VCL) HRD parameter is present in the bitstream, obtaining a third flag specifying whether a temporal distance between output times of consecutive pictures in the bitstream has a fixed value, deriving output times of the pictures in the bitstream, based on at least one of the first flag, the second flag or the third flag, and processing the pictures in the bitstream based on the derived output times. Based on the first flag having a second value specifying that the NAL HRD parameter is not present in the bitstream and the second flag having a second value specifying that the VCL HRD parameter is not present in the bitstream, it may be constrained that the third flag has a first value specifying that the temporal distance between the output times of the consecutive pictures in the bitstream has a fixed value.