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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)： | 18/57頁 |
| 文件大小： | 656K |
| 代理商： | M66335FP |
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MITSUBISHI
DIGITAL ASSP
M66335FP
FACSIMILE IMAGE DATA PROCESSOR
18
`
Error diffusion
The error diffusion, which is a conditional determination method, lo-
cally diffuses density errors between the original image and the re-
sult to obtain the best approximation. This generates images with
good compatibility of gradation and resolution.
This is operated by selecting the error diffusion in conversion-into-
binary mode selection.
: register 07 (MODE)
In error diffusion, dithers as well as density errors are added to image
data. The dithers are data as commonly used for the dither matrix.
: register 08 (ERROR)
γ
correction must be performed in the error diffusion.
Dither matrix
m
m
n
n
17
9
12
20
25
10
11
8
15
19
1
2
4
2
1
2
4
2
5
–32
K
2
K
1
Fmn
Gmn
Fmn
Fmn
>
32
→
Gmn = 63 (white)
Fmn <
32
→
Gmn = 0 (black)
Fmn = Fmn + K
1
(1/
Σα
klEm–k, n–1 + K
2
(dither –32)
k,1 k,1
Integrated error
Σα
klEm–k, n–1 (Note 2)
Error Emn = Fmn
– Gmn
(Note 1)
Weighting of the
error filter
α
kl
Error buffer memory
Preceding line
Current line
K
1
= register 08 (error)
K
2
= register 08 (dither addition factor)
Note 1: Characterized by using the difference
from the corrected value Fmn rather
than that from the original pixel Fmn.
2: Errors before the point of remark are
integrated.
Fig. 14 Error diffusion method
Organized dither
The M66335 has built-in SRAM with a configuration of 64 words
×
6
bits for organized dither memory.
In the initial setting, write the threshold value proper for the preferred
dither pattern to the dither memory after setting the dither matrix size.
: register 07 (DITH)
: register 10 (DITH_D)
An example of dither patterns is shown in Fig. xx.
For the procedure of inputting/outputting data, refer to the section on
writing to/reading from the dither memory.
+
–
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