Reference frame data prefetching in block processing pipelines
US9292899B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2013 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | May 2, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Block processing pipeline methods and apparatus in which pixel data from a reference frame is prefetched into a search window memory. The search window may include two or more overlapping regions of pixels from the reference frame corresponding to blocks from the rows in the input frame that are currently being processed in the pipeline. Thus, the pipeline may process blocks from multiple rows of an input frame using one set of pixel data from a reference frame that is stored in a shared search window memory. The search window may be advanced by one column of blocks by initiating a prefetch for a next column of reference data from a memory. The pipeline may also include a reference data cache that may be used to cache a portion of a reference frame and from which at least a portion of a prefetch for the search window may be satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.