A spectral curve acquiring device comprising: a light receiving optical system (6) for irradiating an irradiating light, a light receiving optical system (8) for dispersing and receiving a reflected irradiating light reflected by an object to be measured (7), a distance meter (4) for measuring a distance to the object to be measured, a storage module (25) for storing a plurality of reference spectral curves prepared based on a light receiving intensity for each wavelength at the time of measuring a white reference plate with different distances, and a control arithmetic module (24), wherein the control arithmetic module obtains a light receiving intensity of the dispersed reflected irradiating light for each wavelength based on the reference spectral curve corresponding to a distance to be measured, corrects a measurement spectral curve prepared based on the light receiving intensity, and prepares a spectral reflectance curve.

Method and system for underwater hyperspectral imaging of seabed impact, environmental state or environmental footprint from natural or man-made sedimentation comprising hyperspectral imaging of ecological, chemical or sediment indicators in an observation area and identifying and classifying ecological, chemical or sediment indicators in the observation area.

Optical sensing devices employing light intensity detectors integrated with nanostructures. In some embodiments, the nanostructures are 3D nanostructures having feature sizes in all three dimensions comparable to a wavelength range of the incident light, and are used for hyperspectral sensing. In some other embodiments, the nanostructures are simultaneous sensitive to both the spectrum and one or more of polarization, angle and phase information of the incident light field, to provide multi-modal optical sensing devices. In some other embodiments, each spatial pixel of an image sensor includes a group of sampling pixels configured for hyperspectral sensing and another group of sampling pixels configured for sensing polarization, angle or phase of the incident light.

Disclosed are a scanner system and a method for recording surface geometry and surface color of an object where both surface geometry information and surface color information for a block of the image sensor pixels at least partly from one 2D image recorded by the color image sensor. A particular application is within dentistry, particularly for intraoral scanning.

Color measurement instruments and processes provide automated and accurate color measurements. Sensor to sample distance is automatically adjusted by the instrument over the course of measurement collection. Adaptive parameters may include turntable speed, illumination spectrum, laser gain setting, number of measurement samples, duration of sampling, sample color measurement threshold, and distance variation measurement threshold.

A spectral imaging device for determining a growth stage of a biomass resource. The device comprising one or two (stereoscopic) cameras and an active illumination means emitting a spectral wavelength. The cameras adapted to capture at least two images comprising data captured in the spectral wavelength emittable by the active illumination means. A processor adapted to analyse at least one image; and wherein images captured by stereoscopic camera generates a 2D and/or a 3D image.

A system for three-dimensional hyperspectral imaging includes an illumination source configured to illuminate a target object; a dispersive element configured to spectrally separate light received from the target object into different colors; and a light detection and ranging focal plane array (FPA) configured to receive the light from the dispersive element, configured to acquire spatial information regarding the target object in one dimension in the plane of the FPA, configured to acquire spectral information in a second dimension in the plane of the FPA, wherein the second dimension is perpendicular to the first dimension, and configured to obtain information regarding the distance from the FPA to the target object by obtaining times of flight of at least two wavelengths, thereby imaging the target object in three dimensions and acquiring spectral information on at least one 3D point.

Provided are methods and systems for concurrent imaging at multiple wavelengths. In one aspect, a hyperspectral/multispectral imaging device includes a lens configured to receive light backscattered by an object, a plurality of photo-sensors, a plurality of bandpass filters covering respective photo-sensors, where each bandpass filter is configured to allow a different respective spectral band to pass through the filter, and a plurality of beam splitters in optical communication with the lens and the photo-sensors, where each beam splitter splits the light received by the lens into a plurality of optical paths, each path configured to direct light to a corresponding photo-sensor through the bandpass filter corresponding to the respective photo-sensor.

A difference between a peak reflectance of a first wavelength component and a reflectance of a second wavelength component having a predetermined wavelength among reflectances of a plurality of wavelength components constituting reflected light in a highlight direction from a glitter material-containing coating film is set as a first difference value. Reflectance is measured of the first and second wavelength components of the reflected light in the highlight direction for the coating film corresponding to a measurement object. A first difference value is calculated by using the measurement result. A storage stores in advance correlation information indicating a correlation between the first difference value and an index value indicating predetermined physical characteristics of a glitter material contained in the coating film. An index value calculator calculates the index value of the coating film corresponding to the measurement object by using the correlation information and the first difference value calculated in the first calculator.

Provided is a compact spectrometer including a light blocking layer having an aperture, a micro lens provided in contact with the light blocking layer, the micro lens being configured to collimate light having passed through the aperture, a filter array configured to filter the collimated light, and a photodetector array configured to detect the filtered light.