Photography – With object illumination for exposure
Reexamination Certificate
2007-11-13
2007-11-13
Perkey, W. B. (Department: 2851)
Photography
With object illumination for exposure
C348S148000, C348S370000
Reexamination Certificate
active
11113521
ABSTRACT:
Video components attributable to ambient lighting in a stream of digital images of a scene illuminated by both ambient and active sources are eliminated in each image frame, leaving only video components attributable to the active source. The spectrum of the active source is encompassed by the ambient source, and spectral filtering defines a primary channel comprising video components in a primary spectrum encompassing both active and ambient lighting and a secondary channel comprising video components in a secondary spectrum encompassing only ambient lighting. The pixels of the secondary channel are scaled by a factor correlating the spectral reflectances of the primary and secondary spectra, and the scaled secondary channel is subtracted from the primary channel to produce an ambient corrected image. The pixels of the ambient corrected image are further scaled to compensate for spectral filter bleeding of the active source into the secondary channel.
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Brown Jeffrey M.
Fox Stephen H.
Delphi Technologies Inc.
Funke Jimmy L.
Perkey W. B.
Suthar Rishi S.
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