Abstract:
Method, system and computer product for formulating a bi-directional color match. In this disclosure, a computing unit obtains spectral measurements of a target bi-directional color. The computing unit uses a bi-directional color formulation tool determine a combination of pigments, dyes and platelet-shaped pigments that generates spectral measurements that match the spectral measurements of the target bi-directional color.
Abstract:
Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics preferably are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence, gloss and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention. A method of producing dental prostheses based on measured data also is disclosed. Measured data also may be stored and/or organized as part of a patient data base. Such methods and implements may be desirably utilized for purposes of detecting and preventing counterfeiting or the like. Low cost and small form factor spectrometers, and methods for manufacturing the same, also are disclosed.
Abstract:
The invention discloses an apparatus for compensation for spectral fluctuation of a light source. Additionally the invention discloses a scanner incorporating the apparatus for compensation. A lamp generates light, which is sent into a light directing device. From the light directing device a sensor means and a spectral monitor means for determining the spectral content of the light from said lamp receive the light. A signal processing means receives the output from said spectral monitor means and said sensor means for producing a signal compensated for spectral fluctuations. A scanner, incorporating the inventive apparatus, additionally comprises a medium for scanning which is positioned between said sensor means and said light directing device and a lens is positioned between said medium for scanning and said sensor means, for imaging said medium onto said sensor means.
Abstract:
The present invention discloses testing turfgrass samples in a spectrophotometer. The resulting color output is provided to a processor for determining the quantitative color scale. The resultant output of the processor might be a single number 1 through 9—depending on the relative “greenness” of the tested turfgrass. To determine the standardized number, the processor compares the received color output from the spectrophotometer to a first stored set of values. Additionally, the received color output can be compared to a second stored set of values to predictively determine if adjusting certain nutrients, water, fertilizer, etc. will result in beneficial or other desired results in the turf. The first and second stored set of values or data is empirically established. In addition, a sealed turfgrass sample as a check or calibration sample, in connection with the use of NIRS equipment to determine instrument performance. The daily use of sealed turfgrass check samples allows the operators to determine the instrument performance and monitor deterioration of the turfgrass check sample. The variability is then incorporated in the future calibration to improve the accuracy and the validity of the NIRS measurements.
Abstract:
An apparatus for measuring color transmissivities of a color separation prism P includes (where the color separation prism P receives a measurement light S on an incident path and emits three color lights Sr, Sg and Sb on three exit paths of different directions): a photomultiplier 21 and an integrating sphere I for measuring an intensity of light entering the integrating sphere I on an entrance path, where the entrance path is set detached from an extension of the incident path; a first movable mirror 9 located in one of four paths including an extension of the incident path and the three exit paths for reflecting the light on each path to the second movable mirror 10; and a second movable mirror 10 placed on the entrance path of the integrating sphere I (with the photomultiplier 21) and oriented in one of four directions for reflecting the light from the first movable mirror 9 to the integrating sphere I. Because the 100%-transmission light and the three color lights transmitted through the color separation prism P undergo the same optical history, absolute transmissivities of the color lights can be measured, and the two-beam method can be used since the integrating sphere I is fixed.
Abstract:
A portable spectrophotometer is disclosed which is provided with a holding case accommodating opto-mechanical color-reading devices and an electronic control device provided with a microprocessor having data and program memories. The spectrophotometer further includes a power source which enables its self-sustained field use.
Abstract:
Color is synthesized by dispersing a beam of light to form a spectrum, effectively blocking a portion of the spectrum with a mask, and recombining the light energies of the unblocked portion(s) of the spectrum to synthesize the color.
Abstract:
In a colorimeter including a light source, a first quantity of light is directed toward a color sample and from the color sample toward a single photoelectric receiving and measuring device which is capable of measuring amounts of primaries or tristimulus values in quantities of light. A first carriage has mounted thereon an X primary filter, a Y primary filter and a Z primary filter, and such first carriage is reciprocable so that a selected primary filter may be positioned in front of the single photoelectric device. Adjacent the light source is mounted a second carriage which supports thereon an X primary filter mirror, a Y primary filter mirror and a Z primary filter mirror. The second carriage is reciprocable to position adjacent the light source a selected primary filter mirror corresponding to that primary filter positioned adjacent the photoelectric device. A second quantity of light from the light source is directed toward the selected primary filter mirror which reflects and changes the spectral characteristics of the second quantity of light. This second quantity of light is then directed toward the color sample and through the selected primary filter to the photoelectric device. Thus, the photoelectric device simultaneously receives two quantities of light and measures a resultant amount of the selected primary or tristimulus value therefrom.
Abstract:
Reflectance measurements of a color sample are made by employing a diffusing sphere having target ports for a color sample, a white standard and a black body. A mirror is mounted within the sphere for pivotal motion about the axis of an exit port to sequentially reflect light from the several targets along a common optical path into a polychrometer which disperses the received light into its spectrum and projects the spectra upon a sensor surface. The sensor may be in the form of an array of light-sensitive elements or the face of an image tube that is scanned or sampled at selected wave lengths of points of the spectrum to be employed in the reflectance measurement. For each sample point, the intensity of light reflected from the black body is subtracted from the intensity of light reflected from the sample and is also subtracted from the intensity of light reflected from the white standard to thereby correct both the sample and white standard measurement for both electrical and other noise of the system, and for stray light within the optical path that impinges upon the sensor surface. The ratios of intensities of the sample to the standard provide reflectance values that may be employed in various color measurements, including calculations of tristimulus values and chromaticity coordinates.
Abstract:
A recording spectrophotometer for measuring the color density of a colored surface necessary for calculating a recipe of color matching based on a colorimetric method, characterized by an integrator capable of calculating density stimulus values of the three primary colors, and an output converter capable of converting the reflectance measured by a photometer to a physical value which is in proportion to the optical density.