Multi-Line Intra Prediction with Selective Reference-Line PDPC
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Solution Overview
Problem
Existing video coding technologies face inefficiencies in intra prediction modes, particularly in handling reference lines during video decoding, leading to suboptimal performance in video quality and compression efficiency.
Innovation Solution
Implementing a method and apparatus that control intra prediction by applying intra smoothing and position-dependent intra prediction combination (PDPC) on specific reference lines while preventing its application on others, based on a reference line index, to enhance decoding efficiency and video quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intra smoothing and PDPC are applied on all reference lines, then prediction accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies different processing operations to different reference lines based on their proximity to the coding unit. Specifically, intra smoothing and PDPC are applied only to the first reference line (nearest to the coding unit) while skipping processing on other reference lines. This local differentiation optimizes prediction accuracy for the most critical reference line while reducing overall processing complexity.
Solution Approach 2:
The patent segments the reference lines into different groups based on their index and proximity to the coding unit. By dividing the reference lines and applying processing selectively to only the first reference line, the system manages complexity while maintaining prediction quality where it matters most.
2Reliability
If PDPC is applied on all reference lines, then video quality is improved, but decoding time increases
Solution Approach 1:
The patent implements local quality by applying PDPC only to the first reference line that is nearest to the coding unit, rather than uniformly applying it to all reference lines. This selective application maintains video quality improvement for the most impactful reference line while significantly reducing decoding time by skipping the computationally intensive PDPC operation on other reference lines.
Solution Approach 2:
The patent applies partial action by implementing PDPC only where it provides the most benefit (on the first reference line) rather than exhaustively applying it to all reference lines. This partial application achieves sufficient video quality improvement while avoiding the excessive computational cost of full application.
3Measurement precision
If multiple reference lines are processed with PDPC, then prediction accuracy is improved, but computational load increases
Solution Approach 1:
The patent applies local quality by concentrating computational resources on the first reference line nearest to the coding unit, where prediction accuracy is most critical. By limiting PDPC processing to this specific reference line and skipping processing on other reference lines, the system optimizes prediction accuracy for the most impactful area while significantly reducing overall computational load and energy consumption.
Data Source
AI summary
A method of and an apparatus for controlling intra prediction for decoding of a video sequence are provided. The method may include based on a reference line index signaling a first reference line nearest to a coding unit, among a plurality of reference lines adjacent to the coding unit, applying intra smoothing on one or more first reference lines comprising the first reference line, among the plurality of reference lines, and based on the intra smoothing being applied on the one or more first reference lines, applying a position-dependent intra prediction combination (PDPC) on one or more third reference lines comprising the first reference line, among the plurality of reference lines, while preventing application of the PDPC on one or more fourth reference lines other than the one or more third reference lines, among the plurality of reference lines.