Intra Prediction Reference Sample Derivation for Video Coding
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Solution Overview
Problem
Current encoding and decoding methods, such as H.265, face challenges in improving coding efficiency for moving pictures.
Innovation Solution
The proposed solution involves an encoder and decoder that derive and generate reference samples for intra prediction by interpolating values on a second line perpendicular to the first line using encoded or decoded pixels, improving the precision of prediction images and excluding high-frequency components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional intra prediction methods are used, then processing complexity is reduced, but coding efficiency deteriorates due to insufficient prediction precision
Solution Approach 1:
The patent extends the traditional 1D reference line approach to 2D reference surface construction by incorporating perpendicular line interpolation. This dimensional expansion allows more comprehensive utilization of spatial correlation in both horizontal and vertical directions, thereby improving prediction precision without excessively increasing processing complexity.
Solution Approach 2:
The patent divides the reference sample derivation process into distinct segments: deriving reference samples on the first line, interpolating values on the perpendicular second line, and projecting interpolated values back to the first line. This segmentation allows each step to be optimized independently, improving overall prediction accuracy while managing processing complexity through modular computation.
2Measurement precision
If reference samples are derived only from the first line, then processing is simplified, but prediction accuracy deteriorates due to limited spatial information utilization
Solution Approach 1:
The patent introduces a perpendicular second line dimension for interpolation, transforming the traditional single-line reference approach into a two-dimensional reference structure. This enables the system to capture spatial correlations in both horizontal and vertical directions, significantly improving reference sample accuracy by utilizing broader spatial context.
Solution Approach 2:
The patent performs preliminary interpolation calculations on the perpendicular second line before final projection to the first line. This preliminary action allows the system to pre-compute intermediate values that capture vertical spatial correlations, which are then integrated into the horizontal reference samples, enhancing overall accuracy without adding excessive complexity to the final prediction step.
Data Source
AI summary
An encoder includes circuitry and memory. Using the memory, the circuitry performs: deriving a plurality of reference samples positioned on a first line, for intra prediction; and generating a prediction image using the plurality of reference samples. The deriving includes interpolating a value on a second line perpendicular to the first line using values of encoded pixels on the second line to generate an interpolated value, and deriving one of the plurality of reference samples by projecting the interpolated value onto the first line.