Abstract:
An optical system comprising an optical instrument and a processing unit. The optical instrument may comprise an illumination source and a sensor. The processing unit may comprise a data storage having stored thereon a characterization of the illumination source and a characterization of the sensor. The processing unit may also comprise a computer configured to calculate a system response of the illumination source and the receiving element considering the characterization of the illumination source and the characterization of the receiving element.
Abstract:
There is provided a small sized imaging apparatus which can measure with high accuracy a color distribution of a surface of an object, in which a light intensity distribution on a predetermined surface in a direction substantially perpendicular to an optical axis is uniform, and a change in an amount of light in a direction along the optical axis is reduced, and an illuminating unit which used in this imaging apparatus. (The imaging apparatus) Includes a light source section (210) which supplies illuminating light, a diffusing section (211) which diffuses by reflecting the illuminating light from the light source section (210), and aperture sections (212a and 212b) which allow to emerge diffused illuminating light, and the aperture sections (212a and 212b) has an aperture diameter D which allows the diffused illuminating light to emerge as a substantially parallel light.
Abstract:
A system provides light of selectable spectral characteristic (e.g. a selectable color combination of light), for luminous applications such a signage and indicator lights (10). An optical integrating cavity (11) combines energy of different wavelengths from different sources, typically different colored LEDs. The cavity has a diffusively reflective interior surface (29) and an aperture (17) for allowing emission of combined light. Control of the intensity of emission of the sources sets the amount of each wavelength of light in the combined output and thus determines a spectral characteristic of the light output through the aperture. A deflector (25) shaped like a number, character, letter, or other symbol, may be coupled to a similarly shaped aperture. By combining several such fixtures, it is possible to spell out words and phrases, with selectable color lighting. Disclosed fixture examples use an extruded body member with appropriately located reflective surfaces to form both the cavity and deflector.
Abstract:
L'invention concerne un dispositif de mesure de teinte dentaire comprenant :
des moyens d'illumination (24, 40, 42, 44, 48, 50), pour successivement illuminer au moins une partie d'une dent (D) avec des lumières de gammes spectrales différentes, au moins un capteur (26) sensible à une lumière en provenance de ladite partie de dent, en réponse à l'illumination, pour générer à chaque illumination de couleur différente, au moins un signal de mesure, des moyens (30,32) de conversion des signaux de mesure correspondant à ladite partie de dent, en des coordonnées d'un point de mesure (202), dans un espace de teintes dans lequel sont définis des points (320, 410, 540), dits de référence, correspondant aux teintes prédéterminées d'un nuancier, et des moyens (114) de recherche, pour la partie de dent, d'une teinte correspondant à un point de référence le plus proche du point de mesure, dans l'espace des teintes.
Abstract:
An LED-based spectrophotometer uses a reconstruction algorithm, based on the spectral characteristics of the illumination source and the color sensing system, to convert integrated multiple illuminant measurements from a non-fully illuminant populated color sensor into a fully populated spectral curve using a reference database. The reference database contains training samples that indicate reflectance spectra and their corresponding LED sensor output. A dynamic, Karhunen-Loeve-based (DKL) spectral reconstruction algorithm, used to reconstruct spectra, gives greater importance to the data from the training samples in the neighborhood of the color sample under measurement. This is done using linear operators and basis vectors.
Abstract:
Color measurement instrument (10) including an integrating sphere (12), a beam splitter (16), a video camera (18), and a spectrograph (20). The beam splitter (16) is aligned with the viewing port (32) of the spectrophotometer to deliver the light reflected from the sample (S) to both the video camera (18) and the spectrograph (20). The video camera (18) provides an image of the position of the sample (S) with respect to the viewing port (32) of the sphere (12), enabling the visual observation and evaluation of the sample position prior to use of the spectrophotometer.
Abstract:
A printed image inspection apparatus comprises an image reading section that irradiates a printed image being inspected with two types of light having different dominant wavelengths and reads images from the reflections of the two types of light, a judgment section that compares the images read by the image reading section with reference images stored in advance and judges the agreement between both, and an operation control section that control the operation of the image reading section and the judgment section. The image reading section comprises a first light source outputting blue light having a low reflectance with respect to yellow, magenta and black inks, and a second light source outputting yellow light having a low reflectance with respect to cyan, magenta and black inks.
Abstract:
An improved spectrophotometer for non-contact measuring of the colors of colored target areas, especially, test patches on moving printed test sheets in an unrestrained normal output path of a color printer, which test patches may be sequentially angularly illuminated with multiple different colors, with a photosensor providing electrical signals in response, the spectrophotometer having a lens system for transmitting that reflected illumination from the test patch to the photosensor with a lens magnification ratio of approximately one to one. The exemplary spectrophotometer provides non-contact color measurements of moving color target areas variably displaced therefrom within normal paper path baffle spacings, with a displacement insensitivity of at least 6 millimeters about a nominal target to spectrophotometer separation.