Patent ID: 7177050

Claim:
A film scanner for converting images on film into electrical signals, comprising: a light source for scanning film; collection optics arranged to image light transmitted by the film through an imaged light path; one or more image light sensors arranged to receive the light from the collection optics through the imaged-light path and to produce one or more image signals representative of an image on the film; a reflector arrangement defining an internally reflective cavity and having at least one entrance aperture for receiving light transmitted by the film and one exit aperture for passing light to the one or more image light detectors and arranged to surround at least a portion of the imaged-light path; a scattered light sensor arranged in relation to the reflector arrangement to receive light which has been transmitted through the film but scattered by the film from the imaged-light path and reflected within the internally reflective cavity to produce a scattered light signal representative of the scattered light; and processing circuitry configured to receive the one or more image signals and the scattered light signal and having functionality to compensate the one or more image signals with reference to the scattered light signal.