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)： 12/57頁
文件大?。?/td> 656K
代理商： M66335FP
MITSUBISHI
DIGITAL ASSP
M66335FP
FACSIMILE IMAGE DATA PROCESSOR
12
`
Uniformity correction
Uniformity correction is to correct shading distortion due to less light
at each end of the light source and faded light around the lens, or
high frequency distortion due to characteristic variations pixel by pixel
in the image sensor.
As shown in Fig. 7, the M66335 makes blocks each of two pixels,
creates a set of uniformity correction data for each block, and
write them to the built-in correction memory (SRAM: 1024 word
×
6
bits) in the UNIF mode selected from its three modes (AGC, UNIF
and SCAN).
The correction data created each for two pixels are read from the
built-in correction memory to correct the input image data consecu-
tively in the SCAN mode. With the register 01 (UNIFS) set at “1”, the
uniformity is not implemented.
With the register 02 (RES) set at “1”, uniformity correction is per-
formed on a block for 4 pixels.
For uniformity correction, white correction or the combination of black
correction and white correction can be selected according to the types
of image sensors as shown in Table 4.
This is set in the register 00 (SENS, UMODE) and register 01 (UNIFM).
To perform both black correction and white correction, the black cor-
rection must be done first.
The M66335 implements the correction in the correction range of
50% as shown in Fig. 7. If a set of white correction data is beyond the
correction range of 50%, the correction are not exactly performed as
shown in Fig. 7. Therefore, ensure that input signals are within the
range.
Fig. 6 Waveform of white data output from the image sensor
Black level
White level
High frequency
distortion
Shading distortion
1 line
White correction + black correction
Analog signal input
V
WL
2
7
–1
2
6
–1
V
BL
White data
Black data
1 line
Correction on over-range data (in white correction)
Analog signal input
V
WL
2
7
–1
2
6
–1
White data
1 line
White correction
Analog signal input
2
7
–1
2
6
–1
White data
1 line
50%
0
V
WL
V
BL
50%
0
V
BL
50%
0
Section over the correction range
White data over the
correction range
Fig. 7 Uniformity correction
Selection of
correction mode
Register 01 (UNIFM)
Table 4 Uniformity correction due to the image sensor
CCD
CIS
Correc-
tion
Image
sensor
cWhite
cWhite
Type of the sensor
Register 00 (SENS)
0
1
Creation of uniformity
correction data
Register 00 (UMODE)
1
1
Period of black
correction : 0
Period of white
correction : 1
0
0
1
1
Register
cBlack
cWhite
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