Patent ID: 6295383
Filing Date: 2001-09-25
Classification: G06T

Abstract:
A method of compensating for pixel variations in an optical scanner that comprises a light source and a line detector detecting pixel intensity information, the method comprising the steps of:initially generating pixel specific line profile data that comprises pixel intensity information by scanning a reference, and storing the pixel specific line profile data;initially generating first smoothed line profile data that comprises pixel intensity information by scanning a background, and storing the first line profile data to represent intensities along the a line at a first point in time;when required generating second smoothed line profile data that comprises pixel intensity information by scanning the background, and storing the second line profile data to represent intensities along the line at a second point in time;generating the difference between said first smoothed line profile data and said second smoothed line profile data to represent changes in the intensities along the line;generating a combination of said difference and said pixel specific line profile data;using said combination to compensate for temporal and along-line changes in pixel intensities in the optical scanner.