This invention relates to a method for the calibration of linear array
photo sensors operating in a specular reflection mode. Errors may be
introduced when a highly diffused image is measured by the linear array
photosensor that was calibrated in a specular mode. These errors result
in artifacts such as streaks in the captured image. The method measures
non-uniformity errors using a highly diffuse white reflective surface,
and then applies an appropriate scaled pixel-wise correction factor to
the image when the sensor is used in the specular mode.