The invention relates to a method and an installation for automatically measuring linear dimensions of manufactured objects (2) of a series comprising:



the disposition of at least one focal point (Fj) of X-rays, on a same base straight line parallel to the rectilinear trajectory of displacement of the objects and of one or several image sensors (Ci);
the acquisition, for each object during its displacement, of a set of one-dimensional images comprising, for a number (NK) of distinct section planes (Pk) containing the base straight line, a number (NP) of said images obtained along at least three different directions of projection (Dijk) in the section plane;
for each object, and for each distinct section plane (Pk), the determination, from the images obtained, of a delineation of the object in the considered section plane (Pk).