&lt;title&gt;Color appearance: effects of texture and relief&lt;/title&gt;

Longère, Philippe; Trémeau, Alain

doi:10.1117/12.324100

Cited by 3 publications

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“…Nowadays CCDs are a key component in many scientific and technological fields used as highlyefficient instruments to characterize complex scenes. In this sense, CCD detectors are employed, for instance, in a wide variety of industrial applications, for color measurements [3,4,5], Astrofsica, iluminacin [6,7], in Astrophysics, in illumination [6,7] (characterization of the spatial distribution of radiant sources) or even in artificial vision [8]. Their increased popularity is due mainly to them showing high resolution, high quantum efficiency, broad spectral response, low noise, linearity, geometric fidelity, fast response, reduced dimensions, low consumption and long life.…”

Section: Introductionmentioning

confidence: 99%

Low-uncertainty absolute radiometric calibration of a CCD

2006

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The use of CCD detectors for radiometric measurements has proven to be very interesting for a variety of fields. This work presents an experimental method for the low-uncertainty calibration of the spectral radiant exposure responsivity of a CCD detector. It contains the description of the experimental setup as well as the analysis of the various sources of uncertainty. The overall result shows that the calibration procedure-related uncertainty is only 0.18% as long as the temperature is kept constant and the field of view is restricted to angles under 13.

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Section: Introductionmentioning

confidence: 99%

Low-uncertainty absolute radiometric calibration of a CCD

2006

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“…Information concerning texture is often acquired at the same time as that of geometry and colour [3]. It has long been neglected in favour of geometric and colorimetric precision.…”

Section: Introductionmentioning

confidence: 99%

Digitization of art pieces based on 3D, colour and texture parameters

et al. 2007

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Within the framework of a French research program, we have developed an optical system dedicated to the measurement of works of art. The purpose is to record the actual optical characteristics of the objects' surfaces in order to be able to display the art object on a screen with a high degree of realism. Three types of data are recorded: 3D shape, true colours and texture.The 3D shape is obtained using a structured light sensor that gives a dense point cloud. A specific procedure allows automatic registration of several point clouds without any contact with the surface.The colours maps are recorded with the structured light sensor's RGB camera and using a built-in lighting system. Both camera and lighting are calibrated using a well-defined procedure. Merging the colour data with the 3D data is straightforward because the same camera is used for both tasks.The texture information is related to the so-called BRDF (Bi-directionnal reflectance distribution function): at each point on the surface, the reflectance is a function of the direction of observation and the direction of illumination. To record this complex texture information, several illumination sources are used, as well as an additional moving camera. Thus, for one 3D point cloud, a complete set of colour pictures is processed to produce texture files that are directly linked to the 3D points.The paper details the measurement procedure as well as the associated data processing. Several results are presented.

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Radiometric calibration of charge-coupled-device video cameras

Campos¹

2000

Metrologia

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Charge-coupled-device (CCD) video cameras have become very important tools in the field of "image science", not only for their good performance as optical cameras but also for their ability to obtain radiometric readings of pixels. This paper reviews calibration procedures for these cameras, concentrating on the radiometric rather than other optical aspects, and proposes new calibration methods as a way of reducing the uncertainty of measurements made with these cameras.

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<title>Color appearance: effects of texture and relief</title>

Cited by 3 publications

References 0 publications

Low-uncertainty absolute radiometric calibration of a CCD

Low-uncertainty absolute radiometric calibration of a CCD

Digitization of art pieces based on 3D, colour and texture parameters

Radiometric calibration of charge-coupled-device video cameras

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