| US 7,602,944 B2 | ||
| Method and system for counting moving objects in a digital video stream | ||
| John Roderick Campbell, Kanata (Canada); Wayne Lawrence Dustin, Ottawa (Canada); Christian Joseph Eric Montminy, Ottawa (Canada); Michael Peter Baynger, Ottawa (Canada); and Alexander Scott Campbell, Ottawa (Canada) | ||
| Assigned to March Networks Corporation, Ottawa, Ontario (US) | ||
| Filed on Apr. 06, 2006, as Appl. No. 11/398,538. | ||
| Claims priority of provisional application 60/668596, filed on Apr. 06, 2005. | ||
| Prior Publication US 2006/0227862 A1, Oct. 12, 2006 | ||
| Int. Cl. G06K 9/00 (2006.01); H04B 1/66 (2006.01) | ||
| U.S. Cl. 382—103 [375/240] | 25 Claims |
| 1. A computer-implemented method of identifying a moving object in a digital video stream, which, when executed on a processor,
causes the processor to perform steps comprising:
determining an area of motion by threshold subtracting a current video frame from a short term average video scene;
determining an object box surrounding an object by threshold subtracting the current video frame from a long term average
video scene;
determining object box coordinates on each line of the video frame by:
generating a line segment based on a starting location and run-length of changed pixels of a current raster line of an object
bitmap;
including the line segment in a box under construction when the line segment is adjacent to the box under construction; and
defining the box under construction as a moving object box when the box under construction intersects with a motion bitmap;
and
storing the object box coordinates as coordinates of the moving object if the object box overlaps the area of motion.
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