Directions for wide-angle intra prediction

By optimizing prediction directions and increasing wide angles to 14 per side for rectangular blocks, the WAIP specification addresses misalignment issues, improving compression efficiency and accuracy in video encoding and decoding.

KR103000562B1Active Publication Date: 2026-08-05INTERDIGITAL VC HOLDINGS INC
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Patent Information

Application Number
KR1020217009213
Authority / Receiving Office
KR · KR
Patent Type
Patents
Current Assignee / Owner
Priority Date
2018-10-01
Filing Date
2019-09-25
Publication Date
2026-08-05
Estimated Expiration
2039-09-25

AI Technical Summary

Technical Problem

The current Wide Angle Intra Prediction (WAIP) specification in the Versatile Video Compression (VVC) standard is suboptimal for rectangular blocks, as the defined wide angles are derived from square block shapes, leading to misalignment of reference arrays and inefficiencies, particularly for blocks with aspect ratios of 8:1, 16:1, and 32:1, due to redundant samples and required extensions.

Method used

The proposed methods align prediction directions with the block shape by increasing the number of wide angles to 14 on each side, ensuring reference array lengths are exactly twice the block's side length, and adjusting angle parameters to optimize for rectangular blocks, eliminating redundant samples and extensions.

Benefits of technology

This optimization improves prediction accuracy and compression efficiency by aligning prediction directions with block shapes, reducing redundant samples, and optimizing reference array lengths, thus enhancing video encoding and decoding performance.

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Abstract

Methods and devices using wide-angle intra prediction for rectangular blocks enable larger prediction angles. Wide-angle intra prediction enables intra prediction direction angles exceeding the conventional 45 degrees and -135 degrees. In one embodiment, when the video block to be coded or decoded is non-square, additional intra prediction directions become available along the longer block edges, and more reference samples are available along those edges. An index is used to indicate the prediction direction and can be adapted according to additional intra predictions in the longer direction, corresponding to fewer prediction directions along the shorter block edges. This preserves the number of prediction modes that need to be indexed, but allows their angles to correspond to the shape of the block.
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