Abstract:
A CMOS light detector configured to detect specific wavelengths of light includes a first sensor and a second sensor. The first sensor includes CMOS photocells that are covered by a colored filter layer of a first color that has a first transmittance that allows both light of the specific wavelengths and light of other wavelengths to pass. The second sensor including further CMOS photocells, at least some of which are covered by both a colored filter layer of the first color and a colored filter layer of a second color, stacked one above the other in either order, where the colored filter layer of the second color has a second transmittance that allows light of the other wavelengths to pass. The first sensor produces a first photocurrent, and the second sensor produces a second photocurrent, when light including both the specific and other wavelengths is incident upon the detector. A differential photocurrent, produced by determining a difference between the first and second photocurrents, has a spectral response with at least part of the light of other wavelengths cancelled.
Abstract:
Es wird ein Strahlungsdetektor (1) mit einer Detektoranordnung (2), die eine Mehrzahl von Detektorelementen (4, 5, 6) aufweist, mittels derer im Betrieb des Strahlungsdetektors ein Detektorsignal (DS) erhalten wird, und mit einer Regelungsvorrichtung (3) angegeben, wobei die Detektorelemente jeweils eine spektrale Empfindlichkeitsverteilung (400, 500, 600) aufweisen und zur Signalerzeugung (S4, S5, S6) geeignet sind, zumindest ein Detektorelement ein Verbindungshalbleitermaterial enthält und dieses Detektorelement zur Detektion von Strahlung im sichtbaren Spektralbereich ausgebildet ist, der Strahlungsdetektor derart ausgebildet ist, dass mittels der Empfindlichkeitsverteilungen der Detektorelemente verschiedene spektrale Empfindlichkeitskanäle (420, 520, 620) des Strahlungsdetektors gebildet sind, in den Empfindlichkeitskanälen mittels der Detektorelemente ein dem jeweiligen Empfindlichkeitskanal zugeordnetes Kanalsignal (K4, K5, K6) erzeugt werden kann, und die Regelungsvorrichtung derart ausgebildet ist, dass die Beiträge verschiedener Kanalsignale zum Detektorsignal des Strahlungsdetektors unterschiedlich geregelt sind.
Abstract:
Sporting items such as soccer balls include a casing region and a graphic region that are defined by enhanced-visibility colors (EVCs) that are substantially complementary. Such EVCs can be selected to avoid colors associated with color confusion in color deficient individuals. In addition, such colors can be selected based on total reflectances to obtain a predetermined luminance contrast. EVCs can be selected based on separations of color coordinate locations using CIE chromaticity coordinates or CIE L-a-b coordinates or otherwise selected. Color selection can include consideration of anticipated viewing backgrounds in a general setting, or colors can be customized for a particular location and particular illumination conditions.
Abstract:
The method for generating a customized light spectral profile used to generate a corresponding light filter, lamp or other type of light illuminant. Wherein a trial light spectrum is generated and a reference light spectrum is determined and used to determine a light source spectrum (110). One or more optical indices are calculated using the trial spectrum and one or more of the optical indices are optimized by varying the trial spectrum to generate the customized spectral profile. A radiation force parameter can be used to minimize unsafe build-up of light in spectral regions. The adaptations of color rendering parameters can be used in the optimization process and the smoothing parameters can be used to enable the easier design of light filter structures. A reflectance camera can be used to measure the reflectance data at one or more pixels of a digital representation of an art object to be illuminated.
Abstract:
A method for determining the optimal colorant thicknesses (104) for integral CIE color-matching filters is provided. According to a computational study, a four band filter of the present invention provides a best approximation to the CIE XYZ color-matching functions with the least cost.
Abstract:
A first method for matching skin colours comprises measuring a spectral reflectance curve of an area of skin and determining a blend of pigments to match the skin's colour by combining spectral reflectance curves measured for pigments to produce a calculated spectral reflectance curve corresponding to that of the skin. The pigment blend is then used, for example, to pigment a medical prosthesis, so that it matches precisely its wearer's skin. This method avoids the problem of metamerism in which colours that match under a first illumination (such as incandescent light) no longer match under a second illumination (such as daylight). A second method uses a database of pigment blends generated by the first method. The colour of an area of skin is measured and a pigment blend is selected from the database that provides a closest match. Apparatus for carrying out such colour matching is also provided, together with palettes of suitable pigments for skin colour matching.
Abstract:
A first method for matching skin colours comprises measuring a spectral reflectance curve of an area of skin and determining a blend of pigments to match the skin's colour by combining spectral reflectance curves measured for pigments to produce a calculated spectral reflectance curve corresponding to that of the skin. The pigment blend is then used, for example, to pigment a medical prosthesis, so that it matches precisely its wearer's skin. This method avoids the problem of metamerism in which colours that match under a first illumination (such as incandescent light) no longer match under a second illumination (such as daylight). A second method uses a database of pigment blends generated by the first method. The colour of an area of skin is measured and a pigment blend is selected from the database that provides a closest match. Apparatus for carrying out such colour matching is also provided, together with palettes of suitable pigments for skin colour matching.
Abstract:
A system for authenticating sampled objects including a database, a plurality of spectrum measuring devices, and a plurality of computers. The database stores a plurality of reference patterns measured from known reference objects. Each of the spectrum measuring devices measures a region of respective sampled objects so as to produce spectral content information identifying the sampled objects. The spectral content information includes information indicative of colors inside the visible spectrum of the human eye. The computers have access to spatial analysis software. The computer receives the spectral content information identifying the sampled object and provides the spectral content information to the spatial analysis software to generate a unique measured pattern. The spatial analysis software compares the unique measured pattern with the reference patterns stored in the database, and outputs signals indicative of matches between the unique measured pattern with the reference pattern within a tolerance level whereby the colors of the regions of the sampled objects are utilized to authenticate the sampled objects.
Abstract:
Sporting items such as soccer balls include a casing region and a graphic region that are defined by enhanced-visibility colors (EVCs) that are substantially complementary. Such EVCs can be selected to avoid colors associated with color confusion in color deficient individuals. In addition, such colors can be selected based on total reflectances to obtain a predetermined luminance contrast. EVCs can be selected based on separations of color coordinate locations using CIE chromaticity coordinates or CIE L-a-b coordinates or otherwise selected. Color selection can include consideration of anticipated viewing backgrounds in a general setting, or colors can be customized for a particular location and particular illumination conditions.