Search

Your search keyword '"Vishwanath, Bharath"' showing total 18 results
Start Over Author "Vishwanath, Bharath"
18 results on '"Vishwanath, Bharath"'

18. A Discrete-Mapping-Based Cross-Component Prediction Paradigm for Screen Content Coding.

Author

Vishwanath B, Zhang K, and Zhang L

Abstract

Cross-component prediction is an important intra-prediction tool in the modern video coders. Existing prediction methods to exploit cross-component correlation include cross-component linear model and its extension of multi-model linear model. These models are designed for camera captured content. For screen content coding, where videos exhibit different signal characteristics, a cross-component prediction model tailored to their characteristics is desirable. As a pioneering work, we propose a discrete-mapping based cross-component prediction model for screen content coding. Our model relies on the core observation that, screen content videos typically comprise of regions with a few distinct colors and luma value (almost always) uniquely conveys chroma value. Based on this, the proposed method learns a discrete-mapping function from available reconstructed luma-chroma pairs and uses this function to derive chroma prediction from the co-located luma samples. To achieve higher accuracy, a multi-filter approach is employed to derive co-located luma values. The proposed method achieves 2.61%, 3.51% and 3.92% Y, U and V bit-rate savings respectively over Enhanced Compression Model (ECM) 4.0, with negligible complexity, for text and graphics media under all-intra configuration.

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results