1. A method for dynamically altering the analysis methodology of millimeter wave imagery in response to the range and direction of motion of a subject, the method comprising: scanning an imaging zone of a scene using at least one millimeter wave camera during a current time frame; calculating values of a grid of discrete cells representing the millimeter wave energy associated with the current time frame; comparing values from the grid of discrete cells associated with the current time frame with values from a grid of corresponding discrete cells associated with the previous time frame; determining a current range and direction of the subject; and dynamically processing millimeter wave imagery of the imaging zone in response to determining the range and direction of motion of the subject.