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Sub-Sampled Cross-Component Prediction for Chroma Component Coding

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Citation Author(s):
Junru Li, Meng Wang, Li Zhang, Kai Zhang, Shiqi Wang, Shanshe Wang, Siwei Ma, Wen Gao
Submitted by:
Meng Wang
Last updated:
30 March 2020 - 4:59am
Document Type:
Presentation Slides
Document Year:
Presenters Name:
Meng Wang
Paper Code:



Cross-component prediction, which takes advantage of inter-channel correlations, predicts the chroma block with the luma reconstructed block according to the associated linear model. Instead of involving all available reference samples in building the linear model, in this paper, we propose a sub-sampled approach that utilizes at most four neighboring chroma samples and their corresponding down-sampled luma samples, leading to significantly reduced operations in the derivation of model parameters at both encoder and decoder. The proposed scheme is hardware friendly in terms of the overheads of memory access and clock cycles, and greatly benefits the practical implementations of the emerging video coding standard in real applications. Extensive experiments reveal that the proposed sub-sampled method provides simple operations and robust coding performance, leading to the adoption by Versatile Video Coding (VVC) Standard and the third generation Audio Video Coding Standard (AVS3).

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