Interpolation filtering for intra prediction in versatile video coding

Gagan Rath; Fabien Racape; Fabrice Urban; Fabrice Le Leannec; Frank Galpin

doi:10.1117/12.2567345

21 August 2020 Interpolation filtering for intra prediction in versatile video coding

Gagan Rath, Fabien Racape, Fabrice Urban, Fabrice Le Leannec, Frank Galpin

Proceedings Volume 11510, Applications of Digital Image Processing XLIII; 1151018 (2020) https://doi.org/10.1117/12.2567345
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

In this paper, we propose a novel interpolation of reference samples for intra prediction in Versatile Video Coding (VVC). To interpolate a predictor value between two reference samples, the method uses four nearest reference samples, as does the existing cubic filter in VVC, but with a simpler design that does not require to pre-compute the filter coefficients. We model the signal as a sum of two components, where the first component is the classical linear interpolation, and the second component is a corrective term that accounts for the change due to the two farther samples. To arrive at this model, we model the signal as a sum of two quadratic functions where each quadratic function models the signal with three adjacent samples. The corrective term is attributed to the quadratic term in the resulting model, which can be calculated on the fly. Since models based on four samples can lead to large errors at edges of objects, we propose to use a thresholding method to decide between the proposed model and the usual linear interpolation. Besides BD-rate performance gain, the advantages of the proposed method are lower complexity, no memory storage of filter coefficients, and a uniform method for both Luma and Chroma components. The proposed method applied in VTM 7.0 intra prediction results in BD-rate gains of 0.13% for Luma and 0.30% for Chroma with lower decoding complexity.

Citation Download Citation

Gagan Rath, Fabien Racape, Fabrice Urban, Fabrice Le Leannec, and Frank Galpin "Interpolation filtering for intra prediction in versatile video coding", Proc. SPIE 11510, Applications of Digital Image Processing XLIII, 1151018 (21 August 2020); https://doi.org/10.1117/12.2567345

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available