Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Reexamination Certificate
2005-04-12
2005-04-12
Mehta, Bhavesh M. (Department: 2625)
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
C358S461000, C358S518000, C382S167000, C382S312000
Reexamination Certificate
active
06879730
ABSTRACT:
There is provided a sensitivity correction method in which shading can be eliminated regardless of a type of a photographic film. A film carrier is moved to a position where a vertical direction center of a first correction plate, having a uniform spectral reflection characteristic, is coincident with an optical axis. Transmitted light from the first correction plate is detected by a linear CCD, and shading data for a positive is acquired. The film carrier is moved to a position where a vertical direction center of a second correction plate, having a spectral reflection characteristic substantially identical to that of a base portion of a negative film, is coincident with the optical axis. Transmitted light from the second correction plate is detected by the linear CCD, and shading data for a negative is obtained. At the time of reading a film image, sensitivity correction is carried out on output data of the linear CCD on the basis of the shading data for the positive in a case in which a photographic film which is an object of reading is a positive film, and on the basis of the shading data for the negative in a case in which the photographic film is a negative film.
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Desire Gregory
Fuji Photo Film Co. , Ltd.
Mehta Bhavesh M.
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