Abstract:
A device comprising an illumination means and a light sensing means, that can examine and memorize a discrete color of an object based on the magnitude of the reflected light bouncing off of the colored surface in at least three areas of the electromagnetic spectrum. The device also provides output as a visually and/or audibly perceptible signal for deciphering the color. The color range identified by the device is not limited to the visible spectrum and may include infra-red and ultra-violet light. A storage means for memorizing colors may also be included in the device. Applications of ColorStick technology may include children's toys, aids for the visually handicapped (e.g. blind or color blind individuals), designers, internet shoppers, gardeners, etc.
Abstract:
A system provides white light having a selectable spectral characteristic (e.g. a selectable color temperature) using an optical integrating cavity to combine energy of different wavelengths from different sources with white light. The cavity has a diffusely reflective interior surface and an aperture for allowing emission of combined light. Control of the intensity of emission of the sources sets the amount of primary color light of each wavelength added to the substantially white input light output and thus determines a spectral characteristic of the white light output through the aperture. A variety of different elements may optically process the combined light output, such a deflector, a variable iris, a lens, a variable focusing lens system, a collimator, a holographic diffuser and combinations thereof.
Abstract:
RGB filter set (520) and color estimation performance for RGB LED color sensing (500) is provided. A criteria function describing an error between desired color matching functions and a spectral response of an RGB filter set (520) is constructed. RGB filter set (520) response characteristics based on the criteria function are then determined. Finally, color estimation parameters for substantially optimal color estimation (500) with the RGB filter set (520) are determined based upon the determined RGB filter set (520) response characteristics. Computer readable code for constructing a criteria function is provided. Computer readable code for determining RGB filter set (520) response characteristics is also provided. Finally, computer readable code for determining color estimation parameters is provided.
Abstract:
Die Erfindung betrifft eine Vorrichtung zur Inspektion von Material mit einer Sensoreinrichtung und einer Beleuchtungseinrichtung, wobei das von der Beleuchtungseinrichtung abgegebene Prüflicht nach der Reflektion und/oder dem Durchscheinen das Materials von der Sensoreinrichtung aufgenommen und in einer Auswerteeinheit ausgewertet wird. Die Beleuchtungseinrichtung weist zumindest zwei Lichtquellen auf, die jeweils Prüflicht unterschiedlicher Lichtfarbe abgeben, wobei die Sensoreinrichtung zumindest zwei auf das unterschiedliche Prüflicht der Lichtquellen abgestimmte Farbkanäle aufweist.
Abstract:
An apparatus and method for capturing visible and non-visible electromagnetic radiation (light) from a source surface (130) and displaying the same radiation, or a proportional quantity of a different radiation, on a second surface (162). The apparatus (100) comprises a lightproof enclosure (102) having an aperture at one end, a light source (106) disposed within the lightproof enclosure (102) opposite the aperture, means (120) for controlling the output intensity of the light source (106), and means (140) for detecting the amount of radiation reflected back from the source surface (130).
Abstract:
The invention is a colorimeter for dental applications comprising a hand-held probe (1), similar in size to a dental drill, attached by an electrical cable (4) to a small self-contained display module (10). The colorimeter provides the capability for measuring the colors of a number points along a line on the surface of an object such as a tooth.
Abstract:
A cassette reader (14) for detecting the status of stained samples (70) is provided. The colorimeter includes one or more high power emitting diodes (64a, 64b) as the source of illuminating the sample (70). An elliptical mirror (69), with a central aperture to permit the light to penetrate on to the sample (70), directs the scattered light on to its focal point at a detector (68). The colorimeter includes a microprocessor (62) which compares an output signal for the percent ratio value of the detected values of a sample (70) and a standard sample. The colorimeter housing (100) provides position sensors (18a-18d) which allow the identification of the well (16a-16d) being examined. Finally, the system is modified to measure cell motility by determining the ratio of motile sperms to total cell concentration.
Abstract:
The invention relates to a method and apparatus for determining the color and/or composition of a material. A sample of the material is illuminated with at least three illumination bands singly or in combination, said illumination bands collectively substantially spanning at least the visible range. The light reflected or transmitted by the sample is measured with at least four light detector elements responsive to light in wavelength bands which substantially span the visible range when the sample is illuminated. The measured reflected or transmitted light is compared to the light reflected or transmitted by a reference material of known apparent emissivity or transmissivity and the apparent emissivity or transmissivity of the sample is calculated therefrom.
Abstract:
An agricultural implement for spraying herbicide on weeds in a field without spraying herbicide on bare soil includes a photodetector circuit. The photodetector circuit includes a photodetector and an active filter. The photodetector is not AC coupled in parallel with an inductor/capacitor resonant circuit which tunes the active filter. As a result, changes in photodetector capacitance due to changes in ambient lighting conditions are not impressed across the resonant inductor/capacitor circuit and therefore do not adversely change the frequency and phase characteristics of the photodetector circuit.
Abstract:
Weeds (100) growing around the bases of the stalks of cotton plant (101) growing in a row (105 and 105A) in a cotton field are sprayed with herbicide without spraying the cotton stalks (101) or wasting herbicide on bare ground (107). The cotton plants are adequately mature that their stalks exhibit a significantly different spectral reflectance characteristic than the weeds typically growing amid the cotton. The cotton plants are adequately tall that the majority of the leaves of the cotton plants are disposed outside the area which can be sprayed using an electronically-controlled valve and nozzle (103). Light is transmitted toward an object (a cotton stalk, a weed, or soil) in the row and the reflected light is analyzed. If the object has a spectral characteristic of a growing weed, then the valve is activated and the object is sprayed with herbicide. If the object does not have the spectral characteristic of a growing weed, then the valve is not activated and the object is not sprayed with herbicide.