Abstract: A galvano device that rotates a mirror provided at a motor shaft by rotating a motor and changes a direction of light by allowing the mirror to reflect the light includes a sensor configured to detect a rotation angle of a motor rotating shaft and a filter configured to estimate a rotation angle of the mirror from a value output from the sensor. The rotation angle of the mirror is output from the filter.

Abstract: The present invention provides a measurement apparatus comprising: an irradiation unit configured to obliquely irradiate a surface with light; a detection unit configured to detect an intensity distribution of reflected light from the surface; a processing unit configured to determine a BRDF of the surface based on the intensity distribution, and generate a first image representing the BRDF as a two-dimensional distribution and a second image representing a one-dimensional distribution obtained by projecting the two-dimensional distribution of the BRDF; and a display unit configured to display the first image and the second image, wherein the processing unit is configured to generate the first image representing the BRDF as the two-dimensional distribution in which an ordinate axis and an abscissa axis are two directions respectively orthogonal to an optical axis of specular light.

Abstract: The present invention provides a measurement apparatus comprising: a measurement unit configured to measure a reflection characteristic of a first region in a surface; an image capturing unit configured to obtain an image of a second region that is larger than the first region and includes the first region, by image-capturing the second region in a state of illuminating the first region so as to be brighter than a region other than the first region in the second region; and a control unit configured to cause a display unit to display a plurality of measurement results obtained by a plurality of times of measurement by the measurement unit, wherein the control unit causes the display unit to display the image which corresponds to a measurement result selected from the plurality of measurement results, together with the plurality of measurement results.

Abstract: A length measuring apparatus configured to perform length measurement for an object moving in a measurement region includes a detector configured to detect light modulated by the object with a Doppler effect, and a processor configured to obtain a measurement value of a velocity of the object based on a signal from the detector, and obtain a length for the object based on the measurement value. The processor is configured to specify a point in time corresponding to the object based on an amplitude of the signal, obtain the measurement value based on the signal with respect to a time duration defined by the point in time, and obtain the length based on the measurement value obtained with respect to the time duration.

Abstract: A length measuring apparatus configured to perform length measurement for an object moving in a measurement region includes a detector configured to detect light modulated by the object with a Doppler effect, and a processor configured to obtain a measurement value of a velocity of the object based on a signal from the detector, and obtain a length for the object based on the measurement value. The processor is configured to specify a point in time corresponding to the object based on an amplitude of the signal, obtain the measurement value based on the signal with respect to a time duration defined by the point in time, and obtain the length based on the measurement value obtained with respect to the time duration.