Reference Picture List Signaling in Video Coding
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Solution Overview
Problem
Current video coding standards face challenges in efficiently signaling reference picture lists, which are crucial for inter prediction and motion compensation, leading to increased complexity and data overhead.
Innovation Solution
The proposed method involves receiving and parsing reference picture list syntax elements, specifically handling a syntax element that specifies the picture order count delta, to effectively manage and signal reference picture lists during video decoding and encoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional reference picture list signaling methods are used, then reference picture lists can be maintained, but data overhead increases and complexity increases
Solution Approach 1:
The patent extracts and separates the picture order count delta value from the full reference picture list signaling. By identifying that only the delta value (difference from the previous reference picture list) needs to be transmitted rather than the entire list, the solution reduces the amount of data that must be signaled while maintaining the ability to reconstruct the complete reference picture list at the decoder.
Solution Approach 2:
The patent changes the signaling parameter from transmitting complete reference picture list information to transmitting only the delta value (picture order count difference). This parameter transformation allows the system to represent the same information with fewer bits, directly reducing data overhead while simplifying the signaling process.
2Measurement precision
If detailed reference picture list information is signaled, then decoding accuracy is maintained, but bitstream size increases
Solution Approach 1:
The patent extracts only the essential changing information (picture order count delta) from the reference picture list, transmitting only what differs from the previous state. This allows the decoder to reconstruct the complete reference picture list with full accuracy while the bitstream contains only the minimal necessary information.
Solution Approach 2:
The patent applies partial action by signaling only the necessary portion of the reference picture list information - specifically the delta value that captures the change - rather than transmitting the complete list again. This partial signaling is sufficient for accurate reconstruction while minimizing bitstream size.
Data Source
AI summary
A video coding device may be configured to signal reference picture lists according to one or more of the techniques described herein. In one example, a method of decoding video data comprises: receiving reference picture list syntax elements; and parsing a syntax element specifying a value of a picture order count delta in the reference picture list syntax elements, wherein the syntax element is defined by i in a range of 0 to a number of entries in the reference picture list syntax elements, wherein: in case that a value i is not equal to zero, the picture order count delta is set to a value of the syntax element defined by i, wherein i is the number of entries in the reference picture list syntax elements, and in a case that a value i is equal to zero, the picture order count delta is set to a value of the syntax element plus one.