Measurement device, electronic apparatus, and measurement method
A spectroscopic camera includes a wavelength variable interference filter, and an image sensor that receives light which is transmitted through the wavelength variable interference filter. Measurement is implemented a plurality of times by causing measurement light to be incident to the wavelength variable interference filter and changing the wavelength of light that is transmitted by the wavelength variable interference filter. Reflectance based on the intensity of light when a first pixel of the image sensor receives light of a target wavelength, is predicted in the respective plurality of repetitions of measurement on the basis of a light reception central wavelength of light that the first pixel receives, and reflectance that is calculated on the basis of the intensity of light that is received by the first pixel.
1. A measurement device comprising:
a spectroscopic element that disperses light of a predetermined wavelength among incidence light, and that is capable of changing a wavelength of the light that is dispersed; and
an image capturing element that receives light that is dispersed by the spectroscopic element, and includes a plurality of pixels,
wherein a wavelength shift amount, which is a difference between a reference wavelength that is a central wavelength of light that is incident to a predetermined reference pixel, and a central wavelength of light that is incident to one of the plurality of pixels, is calculated on the basis of each image capture result when images of a plurality of reference subjects are captured using the spectroscopic element and the image capturing element.
2. The measurement device according to claim 1 ,
wherein the reference subjects have known reflectances.
3. The measurement device according to claim 1 ,
wherein the wavelength shift amount is calculated on the basis of each image capture result when the images of a plurality of reference subjects having different reflectances, are captured.
4. The measurement device according to claim 1 ,
wherein the wavelength shift amount is calculated using a least squares technique.
5. The measurement device according to claim 1 , further comprising:
a correction unit that corrects a spectroscopic image on the basis of the respective wavelength shift amounts in the plurality of pixels when the spectroscopic image of the first wavelength, which is dispersed by the spectroscopic element is captured by the image capturing element by causing measurement light to be incident to the spectroscopic element.
6. The measurement device according to claim 1 ,
wherein the spectroscopic element is a Fabry-Perot etalon element.
7. An electronic apparatus comprising:
the measurement device according to claim 1 .
8. A measurement method of a measurement device including
a spectroscopic element that disperses light of a predetermined wavelength among incidence light, and that is capable of changing a wavelength of light that is dispersed, and
an image capturing element that receives light that is dispersed by the spectroscopic element, and includes a plurality of pixels,
the method comprising:
capturing images of a plurality reference subjects using the spectroscopic element and the image capturing element; and
calculating respective wavelength shift amounts between a reference pixel and each of the plurality of pixels from differences between a reference wavelength, which is a central wavelength of light that is incident to the reference pixel, and a plurality of wavelengths of light that is incident to each of the plurality of pixels, on the basis of each image capture result for the plurality of reference subjects.