Toshiba e-STUDIO281c Service Manual page 172

Image of an original placed on the original glass is scanned by the optical system. The CCD (Charge
Coupled Device) reads the optical image signals and converts them into the electrical signals. The elec-
trical signals are amplified and undergo analog-to-digital conversion, then are changed into digital sig-
nals. Shading correction (correction of variance in CCD elements and the light source) is performed
and the digital signal is output as an image signal from the scanning section.
Shading
Signal A/D
Next process
CCD
correction
amplification conversion
Fig.7-2
The image processing section inputs the image signal from the scanning section and applies various
image processing on the signal, then transmits the output result to the writing section.
Images are processed by the SYS board and LGC board in this equipment. Also, the image signals
read with the Scanning Function and the printer image signals are processed in the SYS board.
e-STUDIO281c/351c/451c IMAGE PROCESSING June 2005 © TOSHIBA TEC
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