M-15
8. IR SECTION
8-1. Image Data Processing
1. Photoelectric Conversion
• The CCD Sensor reads the light reflected off the original and converts the data to a cor-
responding analog signal.
2. A/D Conversion
• The analog signal output from the CCD Sensor is converted to a corresponding 8-bit dig-
ital signal.
3. Shading Correction
• Corrected is an error that occurs due to variations in sensitivity of each CCD chip and the
light distribution varying along the length of the Exposure Lamp.
4. Gamma Correction
• The light reflection data read by the CCD Sensor is translated to corresponding image
density data.
5. Zoom Processing
• The synchronous timing of the input data (write) 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 and sub scanning direction.
6. Background Level Detection
• The background of the original is detected to establish a threshold value between the
background and the image data.
7. Binarization
• The 8-bit image data is translated to one-bit (binary) data.
8. Data Buffer
• The binarized image data is amplified.
• The data is transmitted to the PH Section.
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