Journal
2022 IEEE INTERNATIONAL CONFERENCE ON VISUAL COMMUNICATIONS AND IMAGE PROCESSING (VCIP)
Volume -, Issue -, Pages -Publisher
IEEE
DOI: 10.1109/VCIP56404.2022.10008810
Keywords
chroma interpolation filter; motion compensation; frequency response; ECM; video coding
Categories
Funding
- National Natural Science Foundation of China [62022002]
- Hong Kong Research Grants Council General Research Fund (GRF) [11203220]
- Hong Kong Innovation and Technology Fund [PRP/059/20FX]
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This paper investigates the role of interpolation filters in motion compensation for video coding and proposes 6-tap DCT-based chroma interpolation filters for chroma motion compensation. The experimental results demonstrate a good trade-off between coding performance and complexity.
Interpolation filters for motion compensation play an important role in video coding. Until recently, interpolation filters for luma motion compensation (MC) draw most of the attention while interpolation filters for chroma motion compensation are less noticeable. This paper comprehensively analyzes different types of interpolation filters and presents 6-tap DCT based chroma interpolation filters for chroma MC. The proposed interpolation filters are designed considering multiple factors, comprising the characteristics of the chroma component, the frequency response of interpolation filter and the expenses of computational complexity. The experimental results show the proposed method can achieve 0.05%, 1.23% and 1.25% BD-rate reductions on average for Y, Cb and Cr components, respectively, with only 2% decoding time increasing under Random Access configuration, compared with ECM-4.0, which is a reference software developed by JVET, targeting at future video coding technologies beyond VVC. Owing to the good trade-off between coding performance and complexity, the proposed method has been adopted in ECM.
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