1. A method for interpreting a control gesture to a mobile device having an image sensor capable of providing a sequence of images, comprising: detecting an object in the sequence of images; determining if the detected object is stationary; if the detected object is determined to be stationary, detecting a change in the detected object; determining one or more parameters associated with the detected change; interpreting a user command indicated by the determined one or more parameters; and executing an action associated with the interpreted user command.