Apparatus for detecting a foreground region for use in a low bit-rate image signal encoder
US5787199A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1995 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Dec 28, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/254
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus, for use in a low bit-rate image signal encoder, for detecting a foreground region in an image signal, wherein the image signal has a number of objects therein and the foreground region has at least one moving object therein, which comprises: a previous frame memory for storing a previous frame of the image signal; a current frame memory for storing a current frame of the image signal; a change detector for comparing the current frame and the previous frame to detect changed pixels, each changed pixel having a differential luminance value; a region detector for detecting an object region for one of the objects in the current frame; and a foreground/background determinator for counting the number of all of the pixels contained in the object region to determine a first size of the object region; and for counting the number of changed pixels which are located in the object region to determine a second size of the object region; and for comparing the first size with the second size to determine whether the object region is the foreground region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.