'method for detecting shifts in line images obtained by a sensor that is airborne or moving in space'

摘要

Method for estimating shifts of line images obtained by an airbome or spaceborne scanning sensor. The invention relates to a method for estimating shifts in line images of an image, referred to as a "composite image", made up of the juxtaposition of J line images. The line images show portions of a scene on the surface (S) of a celestial body that are different and successively acquired by a row of sensitive cells of a sensor (10) on board a vehicle flying over said celestial body. The shifts in the line images are induced by sighting errors of the sensor (10) during the acquisition of the line image Lj. According to the invention, the lateral and/or longitudinal shift of a line image Lj relative to a line image Lj, where j is different from i, is estimated according to a local model of lateral and/or longitudinal variation of the similarity between different line images. The invention also relates to a method for forming composite images using line images with shifts. (Figure 3)