Abstract:
A color measurement method performs a color measurement in which an influence of a fluorescent brightening age included in a printed form is corrected. With respect to the influence of the fluorescent brightening age, a measurement is performed only on a white portion of the printed form. With respect to the color patches constituting a color chart, a correction is performed by a correction quantity in which a reference correction quantity for correcting the influence of the white portion is weighted.
Abstract:
An exemplary fishing lure evaluation system includes a light transmission element, such a red-free green filter of 50% transmissivity, arranged relative to a light source for illuminating the lure under evaluation primarily with light transmitted through the element so as to reproduce the natural underwater illumination for the lure including the effects of the water coloration and the light level preference of the type of fish targeted. Preferably, a viewing element is included through which the lure is observed, such as a clear lens or red-free green filter of 50% transmissivity, to duplicate the effects of the water between the fishing lure and the fish for a nominal presentation distance. Specific forms of the invention include an assortment of filters for use with a conventional flashlight or, alternatively, a lightweight plastic tube having, for example, red-free green sides, an open end and a clear condensing lens at the opposite end to reproduce the primary winter feeding conditions for steelhead or salmon for short or long presentation distances depending on whether the user views the lure through the lens or the sides, respectively. The system permits evaluation of all types of lures including homemade lures, fluorescent lures and multicolored lures. A standard proven effective for the local fish population, such a natural food specimen, can be used to select a color attractive to this population, or the system can be used to grade the lures according to how well they hold their apparent color when observed with the system.
Abstract:
A reference-color measurement step of obtaining a reference-color measurement value by measuring a spectroscopic-radiation luminance of a light being emitted from a reference-color portion in a measurement direction, or a tristimulus value thereof, using a light-source-color measuring instrument 5, without irradiating the reference-color portion with a light source for measurement, in a predetermined measurement environment; an objective-portion measurement step of obtaining an objective-portion measurement value by measuring a spectroscopic-radiation luminance of a light being emitted from a measurement-objective portion in the measurement direction, or a tristimulus value thereof, using the light-source-color measuring instrument 5, without irradiating the measurement-objective portion with a light source for measurement, in the measurement environment; and a color identification step of finding a color of the measurement-objective portion by means of computation from a ratio of the objective-portion measurement value with respect to the reference-color measurement value are equipped. Even when measuring a color of such a body, like a body including a fluorescent material, whose reflectivity has changed depending on the type of light source, it is possible to measure the color of such a body accurately.
Abstract:
Devices, systems, and methods for measuring the color of a sample are disclosed. The exemplary device may have one or more light emitting diodes for directing a beam of ultraviolet light onto the sample and may also have one or more light emitting diodes for directing a beam of visible light onto the sample. The exemplary device may have a component for controlling the timing and power of operation of each light emitting diode. The exemplary device may also have at least one light detector for receiving the beam of light reflected from or transmitted through the sample and measuring at least one wavelength band of the received light. The exemplary device may further have a measurement analyzer for determining the color of the sample based on the measured light. The color may be determined for a specified illuminator incorporating effects of fluorescence.
Abstract:
The invention concerns a device for colour coding digital images of fluorescent objects on a computer-aided table scanner. The device consists of a colour scanner provided with an ultraviolet lamp as light source, a reflecting band highly fluorescent in the visible as auxiliary reference white and a cover whereof the surface in contact with the measured object is reflecting but not fluorescent.
Abstract:
A scanning device for the photoelectric measurement pixel by pixel of a measurement object in the form of a printed sheet comprises a measurement table (MT) for supporting the measurement object, a measurement system movable over the surface of the measurement table for scanning pixel lines of the measurement object, a driving system for moving the measurement system over the measurement object, a measurement and driving control system for the measurement system and the driving system, and a processing system for processing and evaluating the measurement signals generated by the measurement system from the scanned pixels of the measurement object (S). The measurement system comprises a lighting system, a photoelectric reception system and optical means. The lighting system exposes pixels located in strip-shaped lighting regions (15) to light at a standardised range of angles of incidence. The photoelectric reception system comprises a plurality of parallel, mutually spaced apart photoelectric line sensors (21) sensitised to different wavelength ranges by upstream chromatic filters (22). The optical means comprise linear optic arrangements (31) which capture the measurement light reflected by the pixels at a standardised range of angles of incidence and direct the measurement light to each one of the line sensors (21). Crosstalk effects between adjacent pixels are substantially reduced by optical screening and other structural measures. The scanning device makes it possible to scan entire printed sheets at high speed and has a comparatively simple structure. It combines the advantages of the known technology of image-capture appliances but does not have its inherent drawbacks. It is there suited for quality control applications in the graphic industry and for the colorimetric control of printing processes.
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:
An apparatus for imaging a tooth having a light source with a first spectral range and a second spectral range. A polarizing beamsplitter (18) light having a first polarization state toward the tooth and directs light from the tooth having a second polarization state along a return path toward a sensor (68), wherein the first and second polarization states are orthogonal. A first lens (22) in the return path directs image-bearing light from the tooth, through the polarizing beamsplitter (18), toward the sensor (68), and obtains image data from the redirected portion of the light having the second polarization state. A long-pass filter ( 15) in the return path attenuates light in the second spectral range. Control logic enables the sensor to obtain either the reflectance image or the fluorescence image.