Abstract
This disclosure describes techniques of line-crossing detection in security camera footage. A security officer or another authorized viewer of the footage draws a line within the field-of-view. The line can be annotated with a direction, such that a person crossing the line in one direction triggers an alarm but crossing it in the opposite direction does not. Person IDs and bounding boxes for each detected person in the time window of interest are retrieved. The coordinates and directionality of drawn lines are retrieved. The bounding boxes are grouped by person ID. Bounding boxes within a group are ordered by timestamp. Iterating over the ordered bounding boxes for a given person ID, if the centroid of a bounding box is on one side of a drawn line and the centroid of a later bounding box is on the other side of the line, then the person is determined to have crossed the line. The timestamps are used to determine if the line crossing occurred in the allowed direction or in the disallowed direction. An alarm is generated if the line crossing occurred in the disallowed direction.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
NA, "Line Crossing Based Unauthorized Movement Detection from Video Footage", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/9515