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PDF M66335FP Data sheet ( Hoja de datos )
| Número de pieza | M66335FP | |
| Descripción | FACSIMILE IMAGE DATA PROCESSOR | |
| Fabricantes | Mitsubishi | |
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MITMSIUTSBUISBHISI 〈HDII〈GDIITGAILTAALSASSPS〉 P〉
M663M36563F35PFP
FACFSAICMSILIMEILIMEAIMGEAGDEATDAAPTAROPRCOESCSEOSSROR
DESCRIPTION
The M66335 is a facsimile image processing controller to turn into
binary signals analog signals which have been output through photo-
electric conversion by the image sensor.
The image processing functions includes peak value detection,
uniformity correction, resolution change, MTF compensation, γ cor-
rection, detection of background/character levels, error diffusion,
separation of image zones, and designation of regions.
This controller contains not only the analog processing circuit, the A/
D converter of a 7-bit flash type and image processing memory, but
also the image sensor and the interface circuit to the CODEC (Coder
and Decoder). Therefore, this LSI alone is capable of image pro-
cessing.
FEATURES
• High speed scan (max. 2 ms/line, typ. 5 ms/line)
• Compatibility with up to the B4 (8 pixels/mm, 16 pixels/mm) image
sensor
• Generation of control signals for the image sensor (CCD, CIS)
For CCD: SH, CK1, CK2, RS
For the contact sensor (CIS): SH, CK1, CK2
• Built-in analog processing circuit (equivalent to the M64291)
Sample and hold circuit
Gain control circuit
Black level clamping circuit
Reference internal power supply for the A/D converter
PIN CONFIGURATION (TOP VIEW)
• Built-in A/D converter of a 7-bit flash type
• Built-in image processing memories
Uniformity correction memory, Line memory, Error memory, γ cor-
rection memory
• External output interface for converted binary data
Serial output (→ M66330)
DMA output
• External output interface for multivalued data
DMA transfer of data compensated for uniformity
• Various image processing functions
Uniformity correction
Resolution change from 50% to 200% (by the 1% step)
MTF compensation (2-dimensional processing, capable of correc-
tion for each character/photo)
γ correction (capable of correction for each character/photo)
Detection of background/character levels
Change to pseudo-halftone
• Error diffusion (64 tone steps through 6-bit processing)
• Organized dither (64 tone steps through the 8 × 8 matrix)
Image zone separation (2-dimensional processing)
• 5V single power supply
APPLICATION
Facsimile, word processor and image scanner
MPU
INTERFACE
DMA
INTERFACE
SYSTEM CLOCK
NC 65
A0 → 66
A1 → 67
A2 → 68
A3 → 69
A4 → 70
CS → 71
RD → 72
WR → 73
RESET → 74
DAK → 75
DRQ ← 76
INT ← 77
SYSCK → 78
GND 79
NC 80
M66335FP
40 NC
39 DGND
38 DVCC
37 VBL ADC BLACK REFERENCE OUTPUT
36 VWL ADC WHITE REFERENCE OUTPUT
35 ← ADIN ADC INPUT
34 AVCC
33 Vri+ ADC WHITE REFERENCE INPUT
32 AGND
31 Vri- ADC BLACK REFERENCE INPUT
30 → BCMO
29 ← BCMV CONTROL SIGNAL FOR
28 ← BCMI ANALOG SIGNAL
27 ← C2 PROCESSING
26 ← C1
25 NC
Outline 80P6N–A
NC: No Connection
1
1 page  
MITSUBISHI 〈DIGITAL ASSP〉
M66335FP
FACSIMILE IMAGE DATA PROCESSOR
(1) Operation mode
The M66335 has three basic operations.
• Peak value detection: Adjusting the peak value of analog signals
output from the analog circuit to the white reference voltage (VWL)
of the A/D converter built in the M66335.
• Generation of data for uniformity correction: Generating data on
a white reference original sheet for uniformity correction by the
sensor unit and writing them to the memory for correction built
in the M66335.
• Read: Reading original sheets, performing image processing of
the read image data, and outputting in serial or parallel the indi-
cated converted binary data.
The M66335 is capable of performing the DMA transfer of
multivalued data (6-bit data=D7~D2, D1=D0=0) after correction
about uniformities.
These three basic operations are performed in the following mode
sequences for the CCD sensor and CIS sensor. The sensor is set
through the register 00 (SENS).
For the CCD sensor
AGC mode
The peak value of the 16 line cycle is de-
tected by setting the AGC command in
the register 00 at “H”.
To escape this mode, set the AGC com-
mand at “L” after a 20 line cycle (or a cycle
of 16 lines or more) passed since the
start.
UNIF mode (white)
This operation mode is started by setting
the UNIF command in the register 00 at
“H” after setting UMODE: “H” (white cor-
rection) in the register 00 and UNIFM: “L”
(only white correction) in the register 01.
Starting by the UNIF command also
makes the system generate data for non-
uniformity correction for white correction
(for the 8 line cycle).
To escape this mode, set the UNIF com-
mand at “L” after a 10 line cycle (or a cycle
of 8 lines or more) passed since the start.
SCAN mode
The read operation mode is started by
setting the SCAN command in the regis-
ter 00 at “H”. To escape this mode, set
the SCAN command at “L”.
For the CIS sensor
AGC mode
The peak value of the 16 line cycle is
detected by setting the AGC command
in the register 00 at “H”.
To escape this mode, set the AGC com-
mand at “L” after a 20 line cycle (or a cycle
of 16 lines or more) passed since the
start.
UNIF mode (black)
When this operation mode is started by
the UNIF command after setting UMODE:
“L” (black correction) in the register 00
and UNIFM: “H” (black and white correc-
tion) in the register 01, the system also
generates black data for non-uniformity
correction for black correction (for the 8
line cycle).
To escape this mode, set the UNIF com-
mand at “L” after a 10 line cycle (or a cycle
of 8 lines or more) passed since the start.
In the case of only white correction, the
setting is not necessary. Follow the
instruction below.
UNIF mode (white)
When this operation mode is started by
the UNIF command in the register 00 af-
ter setting UMODE: “H” (white correction)
in the register 00 and UNIFM: “L” (only
white correction) in the register 01, the
system also generates white data for non-
uniformity correction for white correction
(for the 8 line cycle).
To escape this mode, set the UNIF com-
mand at “L” after a 10 line cycle (or a cycle
of 8 lines or more) passed since the start.
SCAN mode
The reading operation is started by set-
ting the SCAN command in the register
00 at “H”. To escape this mode, set the
SCAN mode at “L”.
The signal operations and data flow
in each basic operation are shown in
the page 4-217 and 4-218, and the flow-
chart is in the page 4-260 and 4-261.
5
5 Page 
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 (VWL, VBL) 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.
Peak value detection
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Line cycle
Preprocessing of peak
value detection
(increasing the gain)
Gain control on the
peak value
(decreasing the gain)
Fig. 4 Peak value detection
Preprocessing of peak value detection
Gain control on the peak value
After the completion of
preprocessing of peak
value detection
VWL
VWL
White data
The output level of the
last pixed of the line
is adjusted to VWL.
After the completion of
gain control on the
peak value
The peak value of the
sensor output in the
line is adjusted to VWL.
VBL
One line
VBL
One line
Fig. 5 Changes of the gain in peak value detection
11
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| PDF Descargar | [ Datasheet M66335FP.PDF ] | |
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