Memory-bandwidth-efficient design for bi-directional optical flow (BIO)
US10904565B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2018 |
| Grant date | Jan 26, 2021 |
| Priority date | — |
| Expiry date | Jun 24, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/553
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device for decoding video data is configured to perform interpolation filtering using an N-tap filter to generate an interpolated search space for a first block of video data; obtain a first predictive block in the interpolated search space; determine that a second block of video data is encoded using a bi-directional inter prediction mode and a bi-directional optical flow (BIO) process; perform an inter prediction process for the second block of video data using the bi-directional inter prediction mode to determine a second predictive block; perform the BIO process on the second predictive block to determine a BIO-refined version of the second predictive block, wherein a number of reference samples used for calculating intermediate values for BIO offsets is limited to a region of (W+N−1)×(H+N−1) integer samples, wherein W and H correspond to a width and height of the second block in integer samples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.