Image Decoding Reference Lists with Ordered POC Signaling
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Solution Overview
Problem
Existing video compression techniques face challenges in effectively signaling video information, particularly for inter prediction and constructing reference picture lists, leading to increased transmission overheads and complexity.
Innovation Solution
The method involves arranging picture order count (POC) information elements in a specific order for reference pictures, with those previous to the current picture in descending order and subsequent pictures in ascending order, and including POC differences and signs to efficiently construct reference picture lists.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If reference picture information is transmitted without specific ordering, then all reference pictures can be signaled, but transmission overhead and decoding complexity increase
Solution Approach 1:
The reference picture list is segmented into two distinct parts: previous pictures (with POC values less than current picture) and subsequent pictures (with POC values greater than current picture). This segmentation allows the decoder to process and organize reference pictures more efficiently by handling each segment with appropriate ordering rules, reducing overall decoding complexity while maintaining complete reference picture information.
Solution Approach 2:
The encoder performs preliminary ordering of POC information elements before transmission, arranging previous pictures in descending POC order and subsequent pictures in ascending POC order. This preliminary organization enables the decoder to reconstruct the reference picture list with minimal processing, reducing decoding complexity while ensuring all reference picture information is preserved.
2Ease of operation
If reference picture information is transmitted with detailed ordering, then decoding complexity is reduced, but transmission overhead increases
Solution Approach 1:
The invention changes the ordering parameter of POC information elements based on the temporal relationship with the current picture. Previous pictures are ordered in descending POC order while subsequent pictures are ordered in ascending POC order. This parameter-based ordering strategy enables efficient decoding without requiring additional transmission data, as the ordering itself conveys organizational information that simplifies decoder operations.
3Manufacturing precision
If high-resolution and high-quality images are used, then image quality improves, but information transfer cost and storage cost increase
Solution Approach 1:
The invention extracts and transmits only the essential POC information elements needed for reference picture list construction, rather than transmitting complete reference picture data. By taking out only the critical temporal ordering information (POC values and their arrangement), the system enables high-quality inter prediction for high-resolution images while minimizing transmission overhead and associated costs.
Data Source
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AI summary
A decoding apparatus for image decoding comprises a memory and at least one processor connected to the memory. The at least one processor is configured to receive picture order count (POC) information, wherein the picture order count (POC) information specifies picture order count (POC) differences for reference pictures, derive picture order count (POC) values for the reference pictures based on the picture order count (POC) differences, construct a reference picture list based on the picture order count (POC) values of the reference pictures, and perform an inter prediction on a current block based on the reference picture list, to derive a predicted sample of the current block. A picture order count (POC) value of an i-th reference picture is derived based on a picture order count difference derived from the POC information. For the reference pictures previous to the current picture in picture order count (POC) order, the picture order count (POC) difference is a difference between the picture order count (POC) value of the current picture and the picture order count (POC) value of the i-th reference picture when the i is equal to 0, and the picture order count (POC) difference is a difference between the picture order count (POC) value of the i-th reference picture and the picture order count (POC) value of an (i-1)-th reference picture when the i is greater than 0. For the reference pictures subsequent to the current picture in picture order count (POC) order, the picture order count (POC) difference is a difference between the picture order count (POC) value of the current picture and the picture order count (POC) value of the i-th reference picture when the i is equal to 0, and the picture order count (POC) difference is a difference between the picture order count (POC) value of the i-th reference picture and the picture order count (POC) value of the (i-1)-th reference picture when the i is greater than 0.