Patent ID: 7119930
Filing Date: 2006-10-10
Classification: G01J,H04N,Y10S

Abstract:
1. An apparatus for recording an image of an object, said apparatus comprising an electronic camera, a calculating unit, one or more light sources, and means for light distribution adapted to distribute light emitted from the light sources and hereby to illuminate the object, light being reflected to the camera, wherein the means for the light distribution comprise an integrating cavity whose inner side has light reflective properties, said integrating cavity provided with first and second openings, the camera is placed in alignment with the first opening so that the optical axis of the camera extends through the first and second openings, the second opening is adapted to receive the object, the one or more light sources are mounted so as to illuminate the interior of the integrating cavity, said camera is adapted to supply a representation of recorded images to said calculating unit, said calculating unit is adapted to perform spectral calibration of said representation, and said apparatus comprises two or more spectral calibration objects having known spectral properties for use when performing said spectral calibration, said spectral calibration objects being faces or objects containing one or more areas with known colors and spatially homogenous reflective properties.