Inter-prediction Method Using Offset Information for Video Decoding
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Solution Overview
Problem
Conventional video encoding and decoding techniques face limitations in encoding and decoding efficiency due to the accuracy constraints of the merge mode in motion estimation, particularly in handling increasing video data volumes and resolutions.
Innovation Solution
An inter-prediction method that extracts merge candidate flags and offset information from a bitstream, selects a merge candidate from neighboring blocks, applies offset information to the motion vector of the selected candidate to determine the motion vector of the current block, and generates a prediction block based on this motion vector in a reference picture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional merge mode is used for motion estimation, then device complexity is reduced, but motion estimation accuracy deteriorates
Solution Approach 1:
The patent changes the parameters of motion estimation by introducing offset information (offset_idx and offset_sign) to modify the motion vector of merge candidates. This allows the system to maintain the simplicity of merge mode while improving motion estimation accuracy through parameter adjustment rather than fundamental algorithm changes.
Solution Approach 2:
The patent introduces an intermediary mechanism (offset information) that acts as a mediator between the simple merge mode and the required motion estimation accuracy. The offset information modifies the motion vectors of merge candidates without requiring a complete change to the merge mode framework, thus resolving the contradiction between simplicity and accuracy.
2Measurement precision
If offset information is added to improve motion estimation accuracy, then measurement precision improves, but loss of information increases
Solution Approach 1:
The patent uses parameter changes to represent offset information in a compact form. By using offset_idx (index) and offset_sign (sign bit) instead of full offset values, the system reduces the number of bits required while maintaining the ability to accurately adjust motion vectors. This resolves the contradiction between accuracy and information loss.
Solution Approach 2:
The patent applies local quality by using different levels of precision for different aspects of offset information. The offset_idx provides the magnitude with limited precision, while offset_sign provides directional information. This localized approach to information representation minimizes total bit usage while maintaining sufficient accuracy for motion estimation.
3Manufacturing precision
If video resolution and frame rate are increased, then image quality improves, but productivity decreases due to larger data volume
Solution Approach 1:
The patent improves encoding and decoding efficiency by changing how motion information is represented and transmitted. By using offset information with limited precision (offset_idx and offset_sign) instead of full motion vectors, the system reduces the amount of data that needs to be processed and transmitted, thereby improving productivity while maintaining image quality.
Solution Approach 2:
The patent extracts only the essential correction information (offset) from full motion vectors. Instead of transmitting complete motion vectors for each block, the system extracts and transmits only the offset information needed to adjust merge candidate motion vectors, reducing data volume and improving processing efficiency while maintaining image quality.
Data Source
AI summary
Disclosed are an inter-prediction method and an image decoding apparatus using the same. According to an embodiment of the present invention, there is provided an inter-prediction method including extracting a merge candidate flag and offset information from a bitstream, selecting a merge candidate corresponding to the extracted merge candidate flag from a merge candidate list including neighboring blocks of a current block as merge candidates, deciding a motion vector of the current block by applying the offset information to a motion vector of the selected merge candidate, and generating, as a prediction block of the current block, a block indicated by the motion vector of the current block in a reference picture referenced by the selected merge candidate.