Displacement measurement device, non-contact input apparatus, and biological micromotion measurement apparatus

A method for measuring displacement, comprising:

• obtaining output data related to a luminance-change coordinate point, the luminance-change coordinate point being detected where a luminance change has occurred, based on light reflected from a measurement object irradiated with coherent light;
• calculating an amount of displacement of the measurement object, based on the data related to the luminance-change coordinate point, by performing computations of a first numerical sequence and a second numerical sequence,
• the first numerical sequence including a set of first elements each representing a location of the luminance-change coordinate point extracted from the data, and
• the second numerical sequence including a set of second elements each representing a location of the luminance-change coordinate point extracted from the data;
• and
• emitting the coherent light for an operation on a displayed virtual image.

A non-transitory recording medium storing a plurality of instructions which, when executed by one or more processors, cause the processors to perform a method for measuring displacement, comprising:

• obtaining output data related to a luminance-change coordinate point, the luminance-change coordinate point being detected where a luminance change has occurred, based on light reflected from a measurement object irradiated with coherent light;
• calculating an amount of displacement of the measurement object, based on the data related to the luminance-change coordinate point, by performing computations of a first numerical sequence and a second numerical sequence,
• the first numerical sequence including a set of first elements each representing a location of the luminance-change coordinate point extracted from the data, and
• the second numerical sequence including a set of second elements each representing a location of the luminance-change coordinate point extracted from the data;
• and
• emitting the coherent light for an operation on a displayed virtual image.