Abstract:
A portable colorimeter for characterizing the optical properties of a colored surface and in particular a colored surface containing metallic or pearlescent particles, which employs three multiangular spectrophotometric measurements to derive color constants for the surface. The colorimeter is a compact integrated unit housing irradiation, detection, control, analysis and display means and employs three illumination angles, preferably -30°, O°, and 65°, and one detection angle, preferably 45°, all measured from the sample normal. The method includes determining the tristimulus values of the color of the sample surface from low resolution spectral reflectance data preferably using twelve detector elements.
Abstract:
L'invention permet de déterminer la couleur à donner en particulier à une prothèse dentaire à partir de la mesure de la couleur des dents adjacentes dans la bouche du patient. Un instrument (44) à fibre optique permet de capter la lumière réfléchie par une dent (50) et de la transmettre à l'entrée d'un spectrocolorimètre (12, 14) associé à un microprocesseur (10), pour déterminer la réflectance spectrale diffuse de la dent et calculer les composantes trichromatiques de ses couleurs apparentes pour divers types d'éclairage. L'invention s'applique notamment à la détermination des couleurs des prothèses dentaires.
Abstract:
An improved color sensor is provided having two sources of illumination, one source being modulated on and off while the other source remains on. Data taken while the modulated source is on is compared with data taken while the modulated source is off to compute the effective fluorescence of the sample. A corrected color spectrum can then be determined for a defined source.
Abstract:
A hyperspectral imaging system and method are presented for use in reconstruction of spectral data of an object. The system comprises: a pixel matrix of a detector; a tunable dispersive unit in front of the pixel matrix; and a control system. The control system comprises: a controller for tuning the dispersive unit during n image acquisition sessions to provide n different partially overlapping spectral transmission profiles of the dispersive unit; and a control unit which is in data communication with the detector and is configured and operable for processing n image data pieces generated by the pixel matrix in said n image acquisition sessions respectively, each being indicative of a spectral image detected by the pixel matrix and corresponding to the different spectral transmission profile of the dispersive unit, and determining the reconstructed spectral data of the object.
Abstract:
A spectroscopic characteristics acquisition unit includes a light emitting unit to illuminate a measurement target; a lens array including lenses to receive reflected light reflected from the measurement target; a light blocking member having a pinhole array including openings; a focusing unit to focus light coming from the pinhole array; a diffraction unit to diffract the light to different directions depending on wavelength of light received by the focusing unit; and a light receiving unit to receive the reflected light diffracted by the diffraction unit. The light receiving unit includes a spectroscopic sensor array having spectroscopy sensors including pixels. Each of the lenses constituting the lens array corresponds to one of the openings of the pinhole array. The numerical aperture NA of the lens in the arrangement direction in the lens array satisfies the formula NA>sin (θmax) with respect to the maximum angle of view θmax of the focusing unit.
Abstract:
A spectroscopic characteristics acquisition unit includes a light emitting unit to illuminate a measurement target; a lens array including lenses to receive reflected light reflected from the measurement target; a light blocking member having a pinhole array including openings; a focusing unit to focus light coming from the pinhole array; a diffraction unit to diffract the light to different directions depending on wavelength of light received by the focusing unit; and a light receiving unit to receive the reflected light diffracted by the diffraction unit. The light receiving unit includes a spectroscopic sensor array having spectroscopy sensors including pixels. Each of the lenses constituting the lens array corresponds to one of the openings of the pinhole array. The numerical aperture NA of the lens in the arrangement direction in the lens array satisfies the formula NA>sin (θmax) with respect to the maximum angle of view θmax of the focusing unit.
Abstract:
A spectral colorimetric apparatus for detecting a color of an image of a test subject illuminated includes a stop; a spectral detection optical system for spectrally detecting a beam diffused in the test subject and passing through the stop; and a guiding optical system for guiding, toward the stop, the beam diffused in the test subject, wherein in a first section which is a section including an optical axis of the guiding optical system, condensing positions of the light beam condensed by the guiding optical system change depending on a position in a direction orthogonal to the first section, and the stop is disposed between condensing positions closest to and farthest from the guiding optical system, of condensing positions, in the first section, of the beam condensed by the guiding optical system, in a direction of the optical axis of the guiding optical system.
Abstract:
Eine Abtastvorrichtung für die punktweise Ausmessung der Farbeigenschaften eines Messobjekts umfasst eine Auflagefläche für das Messobjekt, einen Farbmesskopf, eine Antriebseinrichtung zur Bewegung des Farbmesskopfs über die Auflagefläche in wenigstens einer Dimension derselben und zur Höhenverstellung des Farbmesskopfs in Richtung senkrecht zur Auflagefläche sowie eine die Antriebseinrichtung ansteuernde und mit dem Farbmesskopf zusammenarbeitende Mess- und Antriebssteuerung. Sie ist mit einer elektronischen Abstandsregelung ausgestattet, welche mittels der Antriebseinrichtung für jeden Messpunkt den Abstand des Farbmesskopfs über dem Messort in Richtung senkrecht zur Auflagefläche auf einen Soll-Messabstand einstellt. Die elektronische Abstandsregelung arbeitet mit vom Farbmesskopf erzeugten Messwerten und daraus berechneten Abstandswerten. Die Abtastvorrichtung ist aufgrund ihrer spezifischen Ausbildung für die berührungslose, hochpräzise Messung auch von kleinsten Messfeldern geeignet und erfordert für die Abstandsregelung keine separaten Messfühler.