1. A method for indicating an area in an image as a candidate of a sought object of interest in a scene, comprising: receiving data indicative of estimated future coarse location of an object in the scene; generating a succession of images of an area in the scene, the images includes the estimated coarse location, comparing between at least two images of said succession, and in the case of difference in at least a respective portion of the at least two images that meets a given threshold, the difference, in a later image, is identified as a candidate object of said object.