Vibration measurement apparatus, vibration measurement method, and computer-readable recording medium

A vibration measurement method for measuring vibrations of an object, comprising:

• calculating, based on time-series images of a measurement target area on the object that are output from an imaging apparatus, a displacement in a surface direction of the measurement target area;
• calculating a displacement in a normal direction of the measurement target area, based on the time-series images and the displacement in the surface direction of the measurement target area;
• and
• calculating vibrations of the object, based on the calculated displacement in the surface direction of the measurement target area and the calculated displacement in the normal direction of the measurement target area.

A non-transitory computer-readable recording medium having recorded thereon a program for measuring vibrations of an object, using a computer,

• the program including instructions that cause the computer to carry out:
• calculating, based on time-series images of a measurement target area on the object that are output from an imaging apparatus, a displacement in a surface direction of the measurement target area;
• calculating a displacement in a normal direction of the measurement target area, based on the time-series images and the displacement in the surface direction of the measurement target area;
• and
• calculating vibrations of the object, based on the calculated displacement in the surface direction of the measurement target area and the calculated displacement in the normal direction of the measurement target area.