COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001CHAPTER 3 IMAGE PROCESSING SYSTEM3-3 R2.3 Gain Correction and Offset Correction of the CCD OutputTo correct discrepancies in the efficiency of photoconversion among pixels, the analogvideo signals from the CCD are corrected: in gain correction, the rates of amplification arestandardized; in offset correction, on the other hand, the output voltage in the absence of in-coming light is set to a specific level.2.4 A/D Conversion of the CCD OutputThe analog video signals of odd-number and even-number pixels after correction are con-verted into 8-bit digital signals that correspond to specific pixel voltage levels by the A/Dconverter.COPIER/ADJUST>ADJ-XY>ADJ-Y (CCD read start position adjust-ment)It is used to adjust the parameter used determining the read start position inmain scanning direction.Range: 0 to 400(A change by ‘1’ results in a shift of 0.1 mm.)F03-205-01DecreaseIncreaseOriginalVertical size plateRead start position
