POC MSB Signaling for Efficient Image Encoding and Decoding
Find Innovative SolutionsGenerate Solutions
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 or bits, necessitating high-efficient image compression technology.
Innovation Solution
An image encoding/decoding method and apparatus based on POC MSB information, where the POC difference between pictures is forced to be less than half the maximum value of the POC LSB, and signaling is enforced for intra pictures, enhancing encoding/decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement 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 POC value is segmented into two parts: POC LSB (least significant bits) and POC MSB (most significant bits). This segmentation allows differential encoding where POC LSB is always transmitted but POC MSB is only transmitted when necessary (when POC difference exceeds threshold), thereby reducing the overall amount of transmitted information while maintaining complete POC reconstruction capability for accurate image decoding
Solution Approach 2:
Instead of always transmitting the complete POC MSB information, the patent applies partial action by only transmitting POC MSB when the POC difference between current and reference pictures exceeds a threshold value. For pictures with small POC differences, the existing POC MSB from reference pictures is reused, reducing redundant transmission while ensuring accurate POC reconstruction when needed
2Measurement precision
If POC MSB information is always signaled, then POC derivation accuracy is improved, but bitstream length increases
Solution Approach 1:
The patent makes the POC MSB signaling dynamic rather than static. The transmission of POC MSB is conditioned on the POC difference between current and reference pictures: when the difference is small, POC MSB is not transmitted (reusing reference picture data); when the difference is large, POC MSB is transmitted. This dynamic approach optimizes bitstream length while maintaining POC derivation accuracy based on actual picture characteristics
Solution Approach 2:
The patent changes the parameter transmission strategy based on the POC difference value. Instead of using a fixed transmission rule, the system adapts the POC MSB transmission decision based on the calculated POC difference, switching between transmission and non-transmission modes to optimize the balance between accuracy and bitstream efficiency
Data Source
AI summary
An image encoding/decoding method and apparatus is provided. The image decoding method comprises determining whether first information specifying a value of a picture order count (POC) most significant bit (MSB) cycle of a current picture is present in a picture header, determining a POC MSB of the current picture based on whether the first information is present in the picture header, and deriving a POC of the current picture based on the determined POC MSB. Based on the first information being not present in the picture header and the current picture being not a CLVSS (coded layer video sequence start) picture, a POC difference between the current picture and a previous picture preceding the current picture in decoding order may be less than half a maximum value of a POC least significant bit (LSB) of the current picture.