FrameMaker Ver5.5E(PC) Di152/Di183 MECHANICAL/ELECTRICAL
01.09.05
M-14
10-1. Image Processing Process
1. Photoelectric Conversion
• Light reflected off the original is read by the CCD Sensor which converts the data to a
corresponding analog signal.
2. Analog-to-Digital Conversion
• The analog signal output from the CCD Sensor is converted to a corresponding 8-bit dig-
ital signal.
3. Shading Correction
• An error is corrected that occurs due to variations in sensitivity of each CCD chip and the
light distribution varying along the length of the Exposure Lamp.
• The data obtained through actually illuminating the shading sheet with the Exposure
Lamp is compared with the shading sheet reading reference value (white = max. data
value) to make the necessary correction.
4. Zoom Processing
• The synchronous timing of the input data (read) and output data (read) is varied to
decrease (reduction) or increase (enlargement) the number of data readings, thereby
reducing or enlarging the image in the main scanning direction.
5. Data is sent to the PH.
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