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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)： | 16/57頁 |
| 文件大?。?/td> | 656K |
| 代理商： | M66335FP |
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MITSUBISHI
DIGITAL ASSP
M66335FP
FACSIMILE IMAGE DATA PROCESSOR
16
`
γ
correction
γ
correction according to the sensitivity characteristics (logarithmic
characteristics) of human eyes is implemented to approximate the
image data to natural images.
To do this, the M66335 writes the
γ
correction table to the built-in
SRAM and read the corrected values corresponding to read image
data values from the SRAM.
γ
= 0.45 is considered to be the optimal for
γ
correction for thermal
head printers. Fig. 12 shows a characteristics example at
γ
= 0.45.
γ
correction processing is set through the register 06 : GAMMA as
follows.
GAMMA : 00
GAMMA : 01
GAMMA : 10
γ
= 1
γ
= conversion table value
γ
= 1 for image zone separation (character)
γ
= conversion table value for image zone
separation (photo)
γ
= conversion table value for image zone
separation (character)
γ
= 1 for image zone separation (photo)
For the procedures of inputting/outputting of data, refer to the section
on writing to/reading from the
γ
correction memory.
GAMMA : 11
Image data
6
Data after
γ
correction
γ
correction memory
6
White 63
Black 0
Black : 0
White : 63
25
34
47
56
8
16
32
48
Image data (address)
I
γ
(
A <5,0>
(Address)
DO <5,0>
(Output)
γ
= 1
γ
= 0.45
Fig. 12
γ
correction by means of the conversion table
IF(D
IN
< D
low
)
D
OUT
= 0
IF(D
low
≤
D
IN
< D
up
)
D
OUT
(
)
IF(D
up
≤
D
IN
)
D
OUT
1.0
D
OUT
0
D
low
D
IN
D
up
1.0
D
IN
-D
low
D
up
-D
low
γ
= 1.0
=
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