Gretag Imaging Ag

X-rite Europe Gmbh

X-rite Switzerland Gmbh

Gretag Systems, Inc.

X-rite Europe Ag

Other

Texas Instruments Corporation

Gretag Aktiengesellschaft

Gretag Imaging Trading Ag

Gretag-macbeth Ag

Beat Frick

Wang-Long Zhou

Peter Ehbets

Adrian Kohlbrenner

Adrian Von Orelli

Mark Wegmuller

Martin Rump

Guido Niederer

Walter Kraft

Francis Lamy

Andrew Masia

Mark Wegmüller

Paul Schenkel

Jorg Hunkemeier

Christopher Schwartz

William E Nelson

Steven Vordenberg

Thomas A Lianza

Richard A Federico

Martin Heller

Wang Zhou

Wilhelm H Koch

Olivier Calas

Marc S Ellens

Karl Ursprung

Max Nussbaumer

Bruno C Rhomberg

Marco Kessler

Lido Feri

James William Vogh, Jr

Stefan Knechtle

Michael Lanker

Thomas Kunz

Mario Offermann

Daniel Dupuis

Zachary Hastings

J&uuml;rg Fenner

Jurg Fenner

Jörg Hünkemeier

Robert Wahli

A color measuring apparatus includes a measurement assembly which includes at least one illumination assembly for applying substantially parallel illumination light to a measurement spot of a measurement object and a pick-up assembly for capturing the measurement light radiated back from the measurement spot in an observation direction and for converting the same into corresponding electrical signals. The illumination assembly includes at least two illumination subassemblies which illuminate the measurement spot from different illumination sub-directions near a first preset nominal illumination direction, each with preferably parallel illumination light. By the illumination from different illumination sub-directions slightly deviating from the nominal illumination direction, angular errors of the illumination assembly can be compensated for in a simple manner.

Color measuring apparatus

A system and method of determining data representing a mapping of optical signals described by image data of a reflecting surface of a structure to a three-dimensional surface geometry of the reflecting surface is provided. At least first, second and third light sources are provided, comprising a broadband point light source, a spectrally variable point light source and a movable linear broadband light source, respectively. First, second and third images are acquired, corresponding to each light source. Surface geometry data describing a three-dimensional surface geometry of the reflecting surface is acquired. Based on the image data and the surface geometry data, reflecting surface mapping data describing a mapping between the reflections described by the first image data, second image data and third image data, and the three-dimensional surface geometry of the reflecting surface is determined.

Method and apparatus for digitizing the appearance of a real material

A hand-held measurement device for appearance analyses includes a measurement array which comprises a number of illumination means for applying illumination light to a measurement field in at least three illumination directions and a number of pick-up means for capturing the measurement light in at least one observation direction. The illumination directions and the observation directions lie in a common system plane. At least one pick-up means is embodied to spectrally gauge the measurement light in a locally integral way, and at least one imaging pick-up means is embodied to gauge the measurement light in terms of color in a locally resolved way. The spectral pick-up means and the locally resolving pick-up means are arranged such that they receive the measurement light reflected by the measurement field under the same observation conditions and in particular from the same observation direction.

Hand-held measurement device for capturing the visual impression of a measurement object

A hand-held measurement device for appearance analyzes includes a measurement array which comprises a number of illumination means for applying illumination light to a measurement field in at least three illumination directions and a number of pick-up means for capturing the measurement light in at least one observation direction. The illumination directions and the observation directions lie in a common system plane. At least one pick-up means is embodied to spectrally gauge the measurement light in a locally integral way, and at least one imaging pick-up means is embodied to gauge the measurement light in terms of color in a locally resolved way. The spectral pick-up means and the locally resolving pick-up means are arranged such that they receive the measurement light reflected by the measurement field under the same observation conditions and in particular from the same observation direction.

The present disclosure advantageously provides apparatus, systems and methods which facilitate estimating and accounting for illumination conditions, viewing conditions and reflectance characteristics for imaged surfaces when performing color measurement, correction and/or transformation in an imaging process, such as photography. Advantageously, the disclosed apparatus, systems and methods may utilize a set of one or more illumination target elements for extrapolating illumination conditions from an imaged scene. The disclosure may be used to improve determination of color correction/transformation parameters and/or to facilitate determining a reflectance model for a target surface of interest.

Imaging apparatus, systems and methods

In a calibrating method for a filter color measuring device that includes at least three color channels, a calibration matrix for transforming output signals of the color channels into tristimulus color values is formed. The calibration is performed spectrally, wherein the spectral sensitivities of the color channels of the color measuring device and the spectral emission properties of typical light sources are measured and stored, and the calibration matrix is calculated from the spectral sensitivities and the spectral emission properties of the light sources and the spectral evaluation functions of the standard observer, e.g., according to CIE 1931.

Color measuring device calibration

The present invention provides a method of digitally generating, via the use of a computer, data indicative of a synthesized appearance of a simulated material having physically plausible appearance attributes. The method includes determining a set of data indicative of the synthesized appearance of the simulated material based at least in part on data associated with the physically tangible source material and at least in part on data of measured attributes of the physically tangible reference material.

Visualization method

A color measuring device includes a lighting arrangement for a measurement field of a measurement object to be measured, a pick-up arrangement for detecting the measurement light reflected back from the measurement field and for converting it into corresponding electric signals, an electronic circuit for controlling operation of the color measuring device and for processing and evaluating the electric signals, and a display for displaying measurement results. The lighting arrangement has a lamp ring with three identical lamp groups for illuminating the measurement field from a predefined range of angles of incidence. The pick-up arrangement has a digital camera which creates an image of the measured measurement field. The electronic circuit is designed to switch the light sources of the lamp groups on sequentially, and the camera creates a separate image of the measurement field for every switched-on light source.

Color measuring device

A hand-held color measurement device is provided that includes a housing with a measurement unit which receives measurement light through a measurement window, converts it into measurement signals, processes the measurement signals to form digital color measurement data, and provides it via a communications interface. A U-shaped bracket is arranged on the housing and includes a middle portion in which a diffuser is integrated. The two side arms of the bracket are rotatably mounted on the housing such that the bracket can be pivoted by 180&#xb0; from a monitor position to an ambient light position and back to the monitor position, and wherein the diffuser lies in front of the measurement window in the ambient light position and is situated at a rear wall of the housing opposite the front wall in the monitor position. A holding mechanism is provided on the housing and on the two side arms of the bracket which fixes the bracket in its monitor position or ambient light position, respectively. The hand-held color measurement device is simple in design and specially suitable for monitor, projection area and ambient light measurements.

Hand-held color measurement device

A hand-held light measuring device includes a device housing (G) with a bottom face incorporating a measuring window () through which a measurement optical path extends so that a measurement object can be measured when the device housing (G) is positioned with its bottom face on the measurement object. The measuring device has an integrated, displaceably mounted white reference tile, which can be moved into the measurement optical path and moved back out of it again. The white reference tile is disposed in an end region of an oblong support plate () on its side directed towards the housing interior. The support plate () is mounted so that it can move backwards and forwards between a parked position and an operating position, and the support plate () terminates the device housing (G) at its bottom face and is recessed into the device housing (G) in the parked position, and the support plate () is lifted out from the bottom face of the device housing (G) and moved in the longitudinal direction and covers the measuring window () by means of the end region incorporating the white reference tile in the operating position. The kinematics of the support plate () and white reference tile are simple in design/operation and the support plate and white reference tile can be moved easily and comfortably.

Hand-held light measuring device

Methods for measuring the colour of printed samples by measuring a first spectral proportion of the total spectral reflection factor of a sample by illuminating the sample with light having no UV element are provided. The methods calculate a spectral correction factor by making allowance for the characterisation data of the brightened substrate and the spectral properties of a selected type of illuminating light, adding the spectral correction factor to the first spectral proportion to obtain the total spectral reflection factor of the measured sample. The methods further evaluate the total spectral reflection factor on the basis of measurements taken with illuminating light with no UV element and with UV light only on a limited set of measurement samples, especially on the non-printed substrate only (paper whiteness).

Method of measuring the colour of printed samples containing brighteners

A handheld color measurement device includes a housing in which an optoelectronic measurement unit is located which receives measurement light originating from a measurement object, converts it into corresponding electrical measurement signals and processes these measurement signals into preferably digital measurement data characterizing the color of the measurement object. It further includes passive components required for the realization of different application functions, such as measurement windows and reference standards, which can be selectively positioned into the measurement beam path of the measurement unit. The passive components are positioned in a first housing block () and the opto-electronic measurement unit as a whole in a second housing block (). The second housing block is adjustable into several defined application positions relative to the first housing block, in which application positions respectively one of the passive components is located in the measurement beam path of the opto-electronic measurement unit. This special division into two mutually relatively adjustable housing blocks allows an easy realization of a compact color measurement device suitable for many application functions, which is distinguished by a particular user friendliness.

Handheld colour measurement device

Growing community of inventors

Buchs, Switzerland

Beat Frick