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參數(shù)資料
| 型號： | M66335FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | FACSIMILE IMAGE DATA PROCESSOR |
| 中文描述： | 傳真寄發(fā)圖像數(shù)據(jù)處理器 |
| 文件頁數(shù)： | 15/57頁 |
| 文件大小： | 656K |
| 代理商： | M66335FP |
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15
MITSUBISHI
DIGITAL ASSP
M66335FP
FACSIMILE IMAGE DATA PROCESSOR
`
MTF compensation
As shown in Fig. 11, image data of characters or pictures photoelec-
trically converted by the sensor unit show degradation in resolution.
MTF compensation function of the M66335 restores the resolution of
X
′
= X +
α
((X – A) + (X – B) + (X – C) + (X – D))
where,
α
: MTF compensation coefficient in the register 08 (MTF_C, MTF_I)
In the above equation,
α
is set according to the register 07 : MODE (selection of conversion-into-binary mode) as follows:
MODE : 00 (simple binary)
α
= MTF_C
MODE : 01 (organized dither)
α
= MTF_I
MODE : 10 (image zone separation) separation (character)
α
= MTF_C for image zone
separation (photo)
MODE : 11 (error diffusion)
α
= MTF_I
α
= MTF_I for image zone
Photoelectric conversion
Original (character)
Original (photo)
Photoelectric
conversion
Photoelectric
conversion
Image signal
MTF
compensation
Data after compensation
Image signal
MTF
compensation
Data after compensation
Fig. 11 MTF compensation
those data and expands the apparent dynamic range by strengthen-
ing the high-pass frequency constituent with the Laplacian filter.
Resolution compensation
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