Bausch-lomb Incorporated

Ning Zhang

Lloyd G Allred

Barry T Eagan

Jeffrey B McBeth

An apparatus for facilitating elimination of ambient light from an image of an object, comprising an illumination apparatus adapted to sequentially illuminate the object using multiple lighting arrangements, an image sensor. The apparatus adapted to form on the image sensor (i) a first image of the object using a first illumination arrangement, (ii) a second image of the object using a second illumination arrangement, and (iii) a dark image of the object without illumination. The image sensor is adapted to A) compare an intensity value of a first pixel in the first image to an intensity value of a corresponding, first pixel in the second image to determine a first minimum intensity value, B) determine if the first minimum intensity value is greater than an intensity value of a corresponding, first pixel in the dark image by greater than a predetermined amount; and C) identify an ambient intensity value (a) as the first minimum intensity value, if the first minimum intensity value is not greater than the intensity value of the first pixel in the dark image by greater than the predetermined amount, or (b) as the intensity value of the first pixel in the dark image, if the first minimum intensity value is greater than the intensity value of the first pixel in the dark image by greater than the predetermined amount.

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Penfield, NY, United States of America

Ning Zhang