1. A method for detecting a removed object in video images, comprising: designating at least one object to be monitored within a field of view of an imaging camera associated with a data-processing apparatus; providing a reference frame with respect to said at least one object; and extracting said object from said reference frame to generate a reference hole image, a reference background image and an object reference image, wherein said reference background image and said object reference image are compared to at least one subsequent input image in order to determine a change with respect to the at least object to be monitored, thereby providing an indication of whether or not said at least object has been subject to a removal or an occlusion from said field of view.