Minolta Di620, Manual, Page: 44 / 466

M-25
1. Photoelectric Conversion (CCD Sensor): PWB-IA
•
Light from the Exposure Lamp (FL1) 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-IA
•
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-IB
•
This block Synthesizes the ODD and EVEN signals received from the preced-
ing block into a single image-data signal.
4. Shading Correction: PWB-IB
•
Corrects shading error introduced by factors such as sensitivity differentials
among CCD sensor pixels, uneven FL1 light distribution, and uneven lens
shading. Following this correction, the resulting data is converted by the
Reflectivity/Density Converter into image density data that is in linear propor-
tional to the density of the original image.
5. Histogram Processing: PWB-IB
•
Generates a histogram of the image data, for use during EE/gain adjustment.
6. Image Monitor: PWB-IB
•
Monitors the image data. Used for detecting the size of the original.
7. Magnification Processing: PWB-IB
•
Adjusts the image in accordance with the feature setting (Enlarge/Reduce)
made at the control panel.
8. MTF Correction: PWB-IB
•
Reduces the image noise contained in the image density data, smooths the
image, adds emphasis to borders of characters and lines, and adds sharp-
ness.
9. IR Density Correction: PWB-IB
•
Corrects the gradation of the image density data, in accordance with the imag-
ing mode and copy density set at the control panel, so as to produce optimal
density and image quality.
10. Octal-to-Binary Converter: PWB-IB
•
Converts image density data from 8-bit data to 1-bit data, using an error-dis-
persing binarization method.
11. S/P Conversion: PWB-IB
•
Converts the binarized image-density data into an 8-bit parallel signal, and
transmits this signal to the memory section.