Toshiba e-STUDIO2330C Service Manual page 160

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.
5. Image memory editing
This function performs editing such as enlargement/reduction, mirror imaging, etc., by using a line
memory. Pixel data for one line in the primary scanning direction is stored in the line memory and
the memory is renewed at each line.
- Enlargement/Reduction
Enlargement/Reduction is accomplished by using the line memory control function in the process
of the image processing operation.
- Mirror image
This is accomplished by reading and outputting data from its end.
6. Rectangular area signal generation
When a rectangular coordinate position is selected, the corresponding rectangular area signals are
generated. Using these signals, various edit processing related to the area specification can be
performed.
7. Editing processing
This function performs trimming and masking.
- Trimming
Using rectangular area signals, the image signals inside the rectangular area are left and the
other image signals are eliminated.
- Masking
Using rectangular area signals, the image data inside the rectangular area are erased.
8. Gamma correction
This function corrects the input/output characteristics of the scanner/printer and adjusts the image
signals so that the input/output characteristics would match with the copy mode.
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Solid black area
Original
Image signal
After correction
Fig. 8-6
8 - 5
Low contrast area
e-STUDIO2330C/2820C/2830C/3520C/3530C/4520C
IMAGE PROCESSING
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