參數(shù)資料
型號(hào)： 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)： 11/57頁
文件大?。?/td> 656K
代理商： M66335FP
11
MITSUBISHI
DIGITAL ASSP
M66335FP
FACSIMILE IMAGE DATA PROCESSOR
(3) Image processing function
The M66335 converts image signals input from the image sensor
into binary data. This includes the simple conversion of characters
and the change of images with various densities into pseudo-half-
tone.
Before the conversion, distortions and characteristic degradations
which signals from the image sensor almost always have must be
corrected or compensated.
Image zone separation must also be performed to realize optimal
conversion-to-binary of the image for the possible shortest trans-
mission time.
Functions required for image processing are as follows.
Peak value detection
Uniformity correction
Resolution change (enlargement, reduction and averaging)
MTF compensation
γ
correction
Background/character level detection (simple conversion to binary)
Change to pseudo-halftone
Organized dither
Error diffusion
Image zone separation
Designation of regions
`
Peak value detection
Because the A/D converter of the M66335 uses the input dynamic
range at 2 Vp-p, the reference voltages (V
WL
, V
BL
) corresponding to
the peak value are fixed. The peak value of analog signals output
from the analog processing circuit must be detected before those
signals are input to the A/D converter in order to adjust the analog
signal peak value to the full-scale value of the converter.
The peak value detection is performed by reading white data from
the sensor in the AGC mode selected from its three modes (AGC,
UNIF and SCAN) of the M66335.
As shown in Fig. 4, preprocessing of peak value detection to increase
the gain at the gain control is performed for a 8 line cycle and gain
control processing to decrease the gain when the A/D converter over-
flows is performed for another 8 line cycle after the start command
(register 00: AGC) in the AGC mode.
As a result, the gain changes as shown in Fig. 5.
Preprocessing of peak value detection
Gain control on the peak value
After the completion of
preprocessing of peak
value detection
After the completion of
gain control on the
peak value
One line
One line
White data
V
WL
V
BL
V
WL
V
BL
The output level of the
last pixed of the line
is adjusted to V
WL
.
The peak value of the
sensor output in the
line is adjusted to V
WL
.
Fig. 5 Changes of the gain in peak value detection
Fig. 4 Peak value detection
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Peak value detection
Preprocessing of peak
value detection
(increasing the gain)
Gain control on the
peak value
(decreasing the gain)
Line cycle
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