Two-measure block classification scheme for encoding video images
US5737537A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Blocks of video frames are classified for encoding, for example, as empty blocks, inter blocks, or intra blocks. This block classification is based on (at least) two statistical measures for each block: a global measure and a local measure. In a preferred embodiment, blocks are classified as empty blocks using an inter sum-of-absolute-differences (SAD) measure (a global measure) and a maximum-absolute-difference (MAD) measure (a local measure). The inter-SAD and MAD measures are generated for each block of the current frame relative to a corresponding reference block of a reference frame. If the inter-SAD and MAD measures are less than specified thresholds, then the block is classified as an empty block for encoding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.