Abstract: An extraction unit acquires a first difference between a non-defective product image, covering a non-defective product sample, and a reference model and a second difference between a defective product image, covering a defective product sample, and the reference model. A extraction unit extracts, as a potential defect, either the first difference or the second difference, whichever satisfies a particular condition. A calculation unit calculates at least one feature quantity with respect to the potential defect extracted by the extraction unit. When the defective product sample includes a plurality of defective product samples and respective feature quantities of the potential defects extracted from the defective product samples have multiple different values, the calculation unit specifies at least one of the feature quantities that has an Nth largest one of the multiple different values as an indicator. The presentation unit presents the indicator specified by the calculation unit.

Abstract: An actuator includes: a member for holding an object thereon; a fixed member; a drive: and a controller. The fixed unit holds the member to allow the member to rotate in at least two directions including a rolling direction and a panning direction or a tilting direction. The drive drives the member in rotation in the at least two directions with respect to the fixed member. The controller drives the member in vibration at a frequency of an audible sound in at least one direction out of the at least two directions. The member includes: a holder for holding the object thereon; and a body for supporting the holder. The holder includes a columnar portion protruding in an axial direction that defines a center of the rolling direction and serving as a rotor to rotate around the axial direction.