APPARATUS AND METHOD FOR DETERMINING THREE-DIMENSIONAL SHAPE OF OBJECT

The present disclosure proposed a detachable second apparatus coupled to a first apparatus that determines a first three-dimensional shape of an object located on a reference plane, and configured to determine an angle of an upper surface of the object with respect to the reference plane, the second apparatus comprising: a first light source configured to sequentially irradiate one or more first pattern lights having one phase range; a beam splitter and one or more lenses configured to change optical paths of the one or more first pattern lights so that a beam of light corresponding to a respective phase of the phase range spreads, and arrives at each point of a partial region of the upper surface of the object; a communication interface configured to communicate with the first apparatus; and a first processor that is electrically connected to the first light source and the communication interface, and that is configured to: obtain, from the first apparatus, first information on one or more first reflected lights generated by reflecting the one or more first pattern lights from the partial region; generate second information indicating the angle of the upper surface with respect to the reference plane based on the first information; and control the communication interface to obtain the first three-dimensional shape of the object based on each of phase changes of one or more second reflected lights from one or more second pattern lights, wherein the first information includes information indicating each light amount value of the one or more first reflected lights, and wherein the second information is used to determine a second three-dimensional shape of the object by correcting the upper surface of the object indicated by the first three-dimensional shape.