Constrained Depth Intra Mode Coding for 3D-HEVC
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Solution Overview
Problem
In 3D video coding, the current 3D-HEVC technology faces issues with depth intra mode coding, where transform tree nodes are not properly constrained, leading to interference between depth modeling mode (DMM) prediction modes and transform tree subdivision, resulting in non-conformity with the standard prediction unit definition and inefficient coding.
Innovation Solution
The proposed solution involves selectively splitting or not splitting transform tree nodes based on whether a depth prediction unit is predicted using a DMM, and determining the prediction mode based on the size of the depth prediction unit relative to the maximum transform block size, to prevent interference and ensure compliance with coding standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transform tree nodes are freely subdivided, then transform resolution is improved, but depth prediction unit integrity is compromised and coding efficiency decreases
Solution Approach 1:
The patent applies segmentation by dividing the transform tree structure into distinct regions based on prediction unit boundaries. When DMM is applied to a depth prediction unit, the transform tree is segmented to match the prediction unit structure, preventing unnecessary subdivisions that would compromise prediction unit integrity while maintaining adequate transform resolution within each segment.
2Measurement precision
If DMM prediction mode is applied, then depth modeling accuracy is improved, but transform tree subdivision creates interference and non-conformity with prediction unit definition
Solution Approach 1:
The patent implements local quality by applying different transform tree subdivision rules to different regions. When DMM is detected in a depth prediction unit, the transform tree in that specific region is constrained to match the prediction unit structure, ensuring standard conformity. Other regions without DMM can maintain normal subdivision behavior, preserving depth modeling accuracy where applicable.
3Manufacturing precision
If transform tree nodes are subdivided, then transform detail is improved, but prediction unit structure integrity is compromised
Solution Approach 1:
The patent applies dynamics by making the transform tree subdivision behavior adaptive based on the prediction mode. The subdivision constraint is dynamically applied only when DMM is detected in depth prediction units, allowing the system to maintain prediction unit structure integrity where needed while permitting normal transform detail enhancement in other areas. This conditional constraint mechanism balances structural integrity with transform quality.
Data Source
AI summary
Techniques include constraining depth intra mode coding in a three-dimensional (3D) video coding process, such as 3D-High Efficiency Video Coding (3D-HEVC). In some examples, the techniques for constraining depth intra mode coding may prevent transform tree nodes from being split into sub-transform tree nodes when a depth prediction unit that corresponds to the transform tree node is predicted according to a depth modeling mode (DMM). In further examples, the techniques for constraining depth intra mode coding may prevent the DMM mode from being used when the maximum transform unit size that corresponds to a depth prediction unit is greater than the size of the depth prediction unit. The techniques for constraining depth intra mode coding may prevent characteristics of the DMM prediction modes used in 3D-HEVC and characteristics of the transform tree subdivision used in 3D-HEVC from interfering with each other.