1. A human machine interface comprising: an image acquisition assembly to acquire a series of substantially consecutive sets of two-dimensional image data of a user via multiple optical paths, said image acquisition assembly comprising: a. an image sensor array having an image sensing area; and b. two or more optical paths directing optical image information of the user onto an at least partially overlapping segment of said image sensing area; a first processing unit to: (1) derive, based on the optical image information of the user from two or more optical paths, estimated three dimensional coordinates of elements of the user body, during the acquisition of at least two of the substantially consecutive sets of two-dimensional image data; (2) determine a movement of one or more body parts of the user between the acquisition of the at least two of the substantially consecutive sets of two-dimensional image data, based on a difference between the estimated three dimensional coordinates of the elements of the user body, during the acquisition of each of the at least two of the substantially consecutive sets of two-dimensional image data; and a second processing unit to: (1) correlate the determined movement of one or more body parts of the user to a user input; and (2) transmit a signal representing the user input.