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arXiv · 2509.25668

Enhanced Template-based Intra Mode Derivation with Adaptive Block Vector Replacement

Jiaqi Zhang·Jiaye Fu·Chuanmin Jia·Siwei Ma·Karam Naser·Thierry Dumas·Saurabh Puri·Milos Radosavljevic
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Abstract

Intra prediction is a crucial component in traditional video coding frameworks, aiming to eliminate spatial redundancy within frames. In recent years, an increasing number of decoder-side adaptive mode derivation methods have been adopted into Enhanced Compression Model (ECM). However, these methods predominantly rely on adjacent spatial information for intra mode decision-making, overlooking potential similarity patterns in non-adjacent spatial regions, thereby limiting intra prediction efficiency. To address this limitation, this paper proposes a template-based intra mode derivation approach enhanced by block vector-based prediction. The adaptive block vector replacement strategy effectively expands the reference scope of the existing template-based intra mode derivation mode to non-adjacent spatial information, thereby enhancing prediction efficiency. Extensive experiments demonstrate that our strategy achieves 0.082% Bjøntegaard delta rate (BD-rate) savings for Y components under the All Intra (AI) configuration compared to ECM-16.1 while maintaining identical encoding/decoding complexity, and delivers an additional 0.25% BD-rate savings for Y components on screen content sequences.

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Jiaqi Zhang, Jiaye Fu, Chuanmin Jia, Siwei Ma, Karam Naser, Thierry Dumas, Saurabh Puri, Milos Radosavljevic. 2025-09-30. Enhanced Template-based Intra Mode Derivation with Adaptive Block Vector Replacement. https://arxiv.org/abs/2509.25668

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