Method for controlling the deposition of elementary semifinished products in a process for building tyres for vehicle wheels

A method and apparatus for controlling the deposition of elementary semifinished products in a process for building tires for vehicle wheels includes: driving in rotation, around a rotation axis, at a rotation speed between about π/8 rad/s and about 6π rad/s, a tire being processed which tire has a radially external surface including one or more elementary semifinished products; sending a first electromagnetic radiation to the radially external surface, the latter generating a corresponding first reflected radiation; detecting, through a first detecting device, at least one first image representative of the first reflected radiation; controlling the first detecting device in such a manner that a first exposure time for detecting the at least one first image is included between about 0.1 s and about 10 s; carrying out a first comparison between the at least one first image and one or more reference data; and generating a first notification signal as a function of the first comparison.