Minolta Di151 Service Manual page 32

1. CCD Signal
• The Exposure Lamp illuminates the original and the light reflected off the original passes
through the mirrors and lens to reach the CCD Sensor which, in turn, converts the optical
data to a corresponding analog electrical signal.
2. Analog to Digital Processing
• This block with gain adjustment, converts the result to 8-bit digital image signals.
3. Shading Correction
• Corrects errors in the image data introduced by factors such as variations in sensitivity
among CCD Sensor pixels, uneven Exposure Lamp light distribution, and uneven lens
shading.
4. Gamma Correction
• Adjusts data so that the scan image's gradation characteristics will be proportional to gra-
dation characteristics of the original.
5. Magnification Processing
• Processes the image data as necessary according to the zoom setting (Enlarge/Reduce)
made on the control panel.
6. Background Detecting and Limitation
• Detects the background of original and adjusts the threshold of image processing.
7. TRC Correction
• Corrects the image data to match it with toner characteristics on the engine side.
• TRC: Toner Reproduce Curve
8. Binary Data
• Converts the 8-bit image gray data to corresponding binary data.
9. Data Buffer
• Transmits binary data to the PH.
M-13