G PHYSICS
G06 COMPUTING OR CALCULATING; COUNTING
G06V IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
G06V20/00 Scenes; Scene-specific elements
G06V20/50 Context or environment of the image
G06V20/52 Surveillance or monitoring of activities, e.g. for recognising suspicious objects
G06V20/54 of traffic, e.g. cars on the road, trains or boats