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 separate 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 width of the illumination bands differs in such a manner that the illumination bands are narrowest near the expected fluorescence absorption bands.
Abstract:
A sensor (10) for measuring reflective, transmissive, or self-luminous samples, comprises a plurality of light sources (18), where each of the light sources emit light of a substantially different wavelength band spaced in the visible spectrum; a reference channel photodetector (20); a sample channel photodectector (22); an optical cap (26) adapted to direct a first portion of the light emitted by each of the light sources to the reference channel photodetector (20); a reflector cone for directing a second portion of the light emitted by each of the light sources to the sample; and a receptor piece (36) for directing the diffuse portion of the light reflected from the sample to the sample channel photodetector (22). The sensor (10) is preferably incorporated into a hand-held "mouse" device, which includes an area on its top surface for seating an index finger of the human hand.
Abstract:
The present invention provides a combination of first providing a coarse adjustment by varying the emitter (1-1 to 1-n) power and duration of the emitter/detector exposure time (SL-1 to SL-n), and then providing a fine adjustment by storing (13) a correction value for each photodetector element (5). The adjustement for each photodetector corrects not only for the range, but also for the offset, providing two correction values. In a preferred embodiment, the low (offset) and high (offset plus range) voltage reference levels for an analog to digital converter (8) are adjusted and stored for each photodector for each color.
Abstract:
The invention concerns a process for checking colour print original copies for correctness and/or accuracy of colouring, alignment, printed image arrangement and the like in the high-speed on-line production of packaging, labelling and comparable mass products. A plurality of production steps are to be performed on different mechanical units whose sequences are controlled by predetermined codes. A plurality of sequentially controlled semiconductor radiation sources (1) of different spectral regions are used. The reflected portion of the radiation focused on the codes of the test sample controls subsequent processing operations via a computer-controlled electronic evaluation system. The semiconductor radiation sources are disposed in a linear and/or monoplanar manner and are controlled sequentially and in a pulsed manner according to their spectral region. The portion of radiation returned by the test sample is projected in the correct position via a receiver lens system onto a CCD receiver and the intensity patterns supplied by the CCD receiver are evaluated by an evaluation system.
Abstract:
An apparatus for measuring spectroscopic reflection characteristics from a specific portion of a living organism, e.g. a human body, to detect any pathological changes in said specific portion, such as the development of cancer cells. Rotation of an interference filter (1) causes a change in the relative angle between the filter and light incident thereon, thereby continuously varying the wave length of the light incident upon an object (26). This light is then made to impinge alternately upon the object (26) and a reference reflecting surface (22) by means of a vibrating mirror (4). The light reflected from the object and reference reflecting surface is photo-electrically detected, and the results of detection are processed electrically to obtain spectrographic information from the object.
Abstract:
The present invention discloses a LED based colorimeter device. The LED based colorimeter device comprises light emitting diode (LED) light source to illuminate the colour for detection and recognition of primary colours, light emitting diode (LED) photo-sensor for sensing primary colour components present in the light reflected from the illuminated colour, microcontroller operatively connected to said LED light source and said LED photosensor and adapted to measure sensor readings corresponding to the LED based photosensor's output and artificial neural network enabled for processing said sensor readings to map with actual color values for detecting or recognizing primary colour components in the illuminated colour.
Abstract:
A smartphone is adapted for use as an imaging spectrometer, by synchronized pulsing of different LED light sources as different image frames are captured by the phone's CMOS image sensor. A particular implementation employs the CIE color matching functions, and/or their orthogonally transformed functions, to enable direct chromaticity capture. Various configurations of spectral capture devices are employed to capture spectral images comprised of spectral vectors having multi-dimensions per pixel. These spectral images are processed for use in object identification, classification, and a variety of other applications. Particular applications include produce (e.g., fruit or vegetable) identification.
Abstract:
The methods and systems disclosed herein include obtaining a first image of a sample, where the first image corresponds to light transmitted through the sample in a first plurality of distinct spectral bands, obtaining a second image of the sample, where the second image corresponds to light transmitted through the sample in a second plurality of distinct spectral bands, and where at least some members of the second plurality of spectral bands are different from the members of the first plurality of spectral bands, and combining the first and second images to form a multispectral image stack, where each pixel in the image stack includes information corresponding to at least four distinct spectral bands, and where the at least four distinct spectral bands include at least one member from the first plurality of spectral bands and at least one member from the second plurality of spectral bands.
Abstract:
A gas measurement system for measuring the concentration of gaseous and/or vaporous components of a gas mixture by means of a color change of at least one reaction substance on a reaction support unit, which is arranged in at least two light permeable channels in such a manner that the color change on the reaction substance can be detected at low expense on a large number of separate positions. The detecting unit which detects the color change can be designed as a digital camera with an electronic image converter or image sensor, and an imaging optics system (e.g., a lens system). Related systems, methods, apparatus, and articles are also described.
Abstract:
An intra-oral imaging apparatus for obtaining an image of a tooth has an image capture apparatus with an imaging sensor that is energizable to obtain image data and one or more optical elements for directing light from the tooth to the imaging sensor. An illumination apparatus has one or more light sources energizable to emit light and a spatial light modulator that is configurable to shape an illumination beam from the emitted light. One or more optical elements relay the shaped illumination beam toward the tooth surface. A control logic processor in signal communication with the imaging sensor obtains image data and in signal communication with the spatial light modulator shapes the illumination beam according to the obtained image data.