Abstract: A real-time trade resource management system is shown. In a construction site having one or more points of ingress/egress a tracking assembly at each point of ingress/egress is used to determine when workers are first and last observed on the site. Each worker on the site is assigned to a specific contract for the construction project. A server, computer readable medium, and method for managing trade resources is described.

Abstract: A system detects motion in a video signal by identifying differences between a current image frame and a reference image frame. A difference profile is calculated that represents the differences between the current image frame and the reference image frame. A motion detection signal is generated by the system if the difference profile exceeds a threshold. In one configuration, the system replaces the reference image frame with each successive current image frame. In other configurations, the system replaces the reference image frame with the current image frame if the difference profile exceeds the threshold. The system generates difference data associated with the differences between the current image frame and the reference image frame. This difference data can be partitioned into multiple blocks. An average value is calculated for each block of difference data.