Abstract:
Light filter apparatus for receiving a light beam (25) having wavelengths in a selected band and for dispersing the light into a plurality of rays (30), with each ray having a different wavelength for which the intensity peaks. The peak wavelength varies approximately continuously with displacement of spatial position in a chosen direction along the filter's light-receiving plane. In one embodiment, the filter is a modified etalon structure having at least two reflecting surfaces whose separation distance is not constant but increases or decreases monotonically with distance in a chosen direction in a light-receiving plane of the etalon. Each of these two reflecting surfaces (26,27) may be planar or non-planar but continuous, or may have a step or staircase configuration. This structure may operate using transmitted light or reflected light. In a second embodiment, an edge filter combination is used to produce a narrow band of transmitted or reflected light having a variable central wavelength that varies with position along the chosen direction. In a third embodiment, a multi-layer thin film structure is used to provide a narrow band of transmitted or reflected light having a variable central wavelength. The filter may be combined with a one-dimensional or two-dimensional array of photosensor elements, which array may be linear, circular or generally curvilinear, one such element receiving a group of adjacent light rays of similar peak wavelength, to provide a plurality of different wavelength readings on an incident light beam for spectrophotometry or colorimetry analysis.
Abstract:
A colour detection system for identifying the colour of incident light, comprises at least two discrete colour detectors (35,36) which have respective response characteristics such that the output signals X, Y ... of the detectors correspond respectively to X = ∫P(λ) x (λ)dλ, Y = ∫P(λ) y (λ)dλ ..., where P(λ) is the spectral power distribution at wavelengthx and x (X), y (λ) .. are colour matching functions corresponding to the respective response characteristics of the detectors, and means (37,38,39) for analogue manipulation of X, Y ... to enable the values of x and y in the Chromaticity Diagram corresponding to the incident colour to be calculated.
Abstract:
An optical densitometer head adapted for application to automatic equipment, and not requiring manual adjustment of filters, comprises a housing (11) including a light source (13), a lens system (15,17) and three photo-electric devices (29,33), each with its own colour filter (25,27). Infra-red filters may be included. The outputs from the devices may be applied to a three-channel amplifier (37) with a characteristic so as to give outputs corresponding to the densities of the three primary colours. The devices may be symmetrically disposed in the housing, and an inspection aperture, normally closed by a plug (not in Figure 1) may be provided.
Abstract:
The examples relate to a method and apparatus to measuring ambient light information that is used in the manipulation or augmentation of an image presented on a display. The apparatus measures ambient light characteristic information from at least one direction in an environment in which the apparatus is located. The measured ambient light characteristic enable substantially real time generation and application of an image effect to an image presented on a display device.
Abstract:
A mechanism is described for facilitating chromatic adaptation of display contents based on chromatic monitoring of environmental light at computing devices. A method of embodiments, as described herein, includes receiving sensory input data indicating one or more ambient colors based on real-time or periodic chromatic monitoring of environmental light surrounding the apparatus. The method may further include referring the sensory input data against contents of a lookup table to determine color compensation of content based on the one or more ambient colors, and dynamically facilitating chromatic adaptation of existing colors of the content based on the color compensation to compensate the content. The method may further include rendering the compensated content to be displayed via a display device.
Abstract:
An apparatus with at least two electromagnetic radiation sensor cells (140-144) that comprise graphene as an electromagnetic radiation absorbing material and electrical connections (150-155) between the at least two sensor cells. The electrical connections are at least
Abstract:
This invention relates to a colour sensor arrangement and to a method for colour sensor calibration. A colour sensor arrangement comprises a colour sensor (1) arranged to generate at least a first channel signal (CH1) being indicative of a colour of light incident on the colour sensor(1). A processing unit (2) is connected to the colour sensor (1) and arranged to generate a tuple of colour signals (R, G, B) by processing the at least first channel signal (CH1). A memory (3) is connected to the processing unit (2) and a control unit (4) is connected to the processing unit (2) and to the memory (3). Furthermore, the control unit (4) is arranged to receive calibration data (M) relating the tuple of colour signals (R, G, B) to a calibrated tuple of colour signals (X, Y, Z) and arranged to store said calibration data (M) by means of the memory (3). An interface (5) is connected to the processing unit (2) and comprises an interface terminal (51).
Abstract:
Disclosed are a scanner system and a method for recording surface geometry and surface color of an object where both surface geometry information and surface color information for a block of said image sensor pixels at least partly from one 2D image recorded by said color image sensor.
Abstract:
A spectral camera has an objective lens (10), an array of lenses (25) for producing optical copies of segments of the image, an array of filters (30) for the different optical channels and having an interleaved spatial pattern and a sensor array to detect the copies of the image segments. Detected segment copies of spatially adjacent optical channels have different passbands and represent overlapping segments of the image, and detected segment copies of the same passband on spatially non-adjacent optical channels represent adjacent segments of the image which fit together. Having segments of the image copied can help enable better optical quality for a given cost. Having an interleaved pattern of the filter bands with overlapping segments enables each point of the image to be sensed at different bands to obtain the spectral output for many bands simultaneously to provide better temporal resolution.
Abstract:
Die Erfindung betrifft eine Detektionseinrichtung (11) für einen Projektor (R), insbesondere multichromen Laserprojektor, wobei die Detektionseinrichtung mindestens ein Paar von Farbfiltern (15r1, 15r2; 15g1, 15g2; 15b1, 15b2) mit einem gemeinsamen vorbestimmten Wellenlängen-Arbeitsbereich (A) und mindestens einen den Farbfiltern nachgeschalteten Fotodetektor (16r1, 16r2; 16g1, 16g2; 16b1, 16b2) aufweist, wobei die Farbfilter eines Paars von Farbfiltern innerhalb ihres Wellenlängen-Arbeitsbereichs einen jeweiligen sich streng monoton in Abhängigkeit von einer Wellenlänge (λ) ändernden Transmissionsgrad (T1r, T2r) mit zueinander unterschiedlichem Vorzeichen aufweisen. Die Erfindung betrifft auch ein System (R, 11) mit einem Projektor (R) und einer Detektionseinrichtung (11), wobei der Projektor (R) mindestens eine Laserlichtquelle (LDr, LDg, LDb) und eine Reflektoreinrichtung (M) aufweist, wobei die Reflektoreinrichtung (M) dazu eingerichtet ist, Licht von der mindestens einen Laserlichtquelle (LDr, LDg, LDb) auf eine Projektionsfläche (F) zu reflektieren. Die Erfindung betrifft zudem ein Verfahren zum Bestimmen mindestens einer Eigenschaft eines Lichtstrahls.