Minolta Di450 Service Manual page 37

1. Photoelectric Conversion (CCD Sensor): PWB-IA
Light from the Exposure Lamp reflects off the original, passes through mirrors and one
lens, and reaches the CCD sensor. The CCD sensor converts the optical data into
analog electrical signals.
2. Analog Processing: PWB-B
This block eliminates noise from the (ODD and EVEN) analog signals output by the
CCD sensor, then converts the result into (ODD and EVEN) 8-bit digital image signals
(A/D conversion).
3. ODD/EVEN Synthesis: PWB-B
This block synthesizes the ODD and EVEN signals received from the preceding block
into a single image-data signal.
4. Shading Correction: PWB-B
Corrects shading error introduced by factors such as sensitivity differentials among
CCD sensor pixels, uneven Exposure Lamp light distribution, and uneven lens shad-
ing.
5. Image Monitor: PWB-B
Monitors the image data. Generates a histogram of the image data, for use dur-
ing EE/gain adjustment.
6. Magnification Processing: PWB-B
Adjusts the image in accordance with the edit function setting (Enlarge/Reduce) made
at the control panel.
7. MTF Correction: PWB-B
Reduces the image noise contained in the image density data, smooths the image,
adds emphasis to borders of characters and lines, and adds sharpness.
8. IR Density Correction: PWB-B
Corrects the gradation of the image density data, in accordance with the image quality
mode and copy density set at the control panel, so as to produce optimal density and
image quality.
9. Octal-to-Binary Converter: PWB-B
Converts image density data from 8-bit data to 1-bit data, using an error-dispersing
binarization method.
10. S/P Conversion: PWB-B
Converts the binarized image-density data into a 4-bit parallel signal, and transmits
this signal to the memory section.
M-17