Inter-view Motion Vector Derivation Using Depth Values
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Solution Overview
Problem
Current video signal processing techniques face challenges in achieving efficient coding of inter-view motion vectors, which are crucial for accurate inter-prediction in multiview video coding.
Innovation Solution
A method and device that obtain a reference view block using a predetermined fixed inter-view motion vector, derive an inter-view motion vector from depth values of reference blocks, and use this vector for decoding the current block, thereby improving prediction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a predetermined fixed inter-view motion vector is used to obtain reference view block, then the device complexity is reduced, but the measurement precision of inter-prediction accuracy deteriorates
Solution Approach 1:
The patent segments the inter-view motion vector derivation process into two distinct phases: (1) initial acquisition using a predetermined fixed inter-view motion vector to reduce complexity, and (2) subsequent refinement using depth map information to improve precision. This segmentation allows the system to balance computational load with prediction accuracy by handling different processing stages separately.
Solution Approach 2:
The patent applies preliminary action by first obtaining the reference view block using a predetermined fixed inter-view motion vector before refining the motion vector using depth map data. This preliminary step ensures that a baseline prediction is available early in the decoding process, reducing initial computational complexity while allowing for later precision improvements.
2Measurement precision
If depth values of reference blocks are used to derive inter-view motion vector, then the measurement precision of inter-prediction is improved, but the loss of time for processing increases
Solution Approach 1:
The patent applies partial action by using only the necessary depth values from the depth map for motion vector derivation rather than processing all depth information. This selective approach improves the accuracy of the inter-view motion vector while minimizing the additional processing time required, as only relevant depth data is extracted and utilized for the specific purpose of motion compensation.
3Measurement precision
If all depth samples within the associated depth block are used for disparity vector derivation, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent extracts only the essential depth values from the depth block that are necessary for accurate disparity vector derivation, rather than processing all depth samples. This extraction approach maintains measurement precision by selecting critical depth information while reducing device complexity by eliminating unnecessary processing of redundant depth data.
Data Source
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AI summary
The present invention relates to a video signal processing method and device capable of: obtaining a reference view block by using a predetermined motion vector; obtaining the depth value of a reference block which corresponds to the reference view block; obtaining an inter-view motion vector for a current block by using at least one depth value of the reference depth block; and decoding the current block by using the inter-view motion vector.