Toshiba e-STUDIO163 Service Manual page 105

Density
0 1 2 3 4 5 6 7 8 9
Primary scanning pixel positions
High-pass filter processing
Character outline blurs when the original, such as text, with big difference in density among the
pixels is optically scanned and output from the CCD. Characteristic of the lens and other factors
cause this phenomenon. In this equipment, processing such as edge enhancement is applied
between the targeted pixel and the neighboring pixels to eliminate this phenomenon and realize
high reproducibility of original.
December 2005 © TOSHIBA TEC
After low-pass filter
Fig. 7-4
Solid black area
Original
Image signal
After correction
Fig. 7-5
7 - 5
Density
0 1 2 3 4 5 6 7 8 9
Primary scanning pixel positions
Low contrast area
e-STUDIO163/203 IMAGE PROCESSING
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