
CM-040GE/CM-040GE-RA / CB-040GE/CB-040GE-RA
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8.3. Basic functions
The CM-040GE/CM-040GE-RA and CB-040GE/CB-040GE-RA cameras are progressive scan
cameras with 10 or 8-bit video output in Gigabit Ethernet. An analogue iris video signal (DIP
switch select) can be used for controlling auto-iris lenses.
The camera has 2/3, 1/2, 1/4 or 1/8 partial scanning for faster frame rates. Vertical binning
is also available.
The camera can operate in continuous mode as well as in 4 triggered modes:
-
Edge Pre-select (EPS)
-
Pulse width Control (PWC)
-
Reset continuous (RCT)
-
Sequential trigger (EPS)
-
Delayed readout (EPS, PWC)
Depending on the timing of the trigger input relationship to FVAL (camera internal Frame
Valid clock), the start of exposure can be immediate (no-delay, LVAL- asynchronous) or
delayed until next LVAL (LVAL - synchronous).
In the following section the functions are described in detail.
8.3.1
Vertical Binning (CM-040GE/CM-040GE-RA only)
The binning function can be used to achieve higher
frame rate or higher sensitivity. The drawback is
lower resolution.
Vertical binning is done by adding the charge from
pixels in adjacent lines in the horizontal CCD register.
Fig. 13 shows the binning principle. Resolution and
frame rate for all combinations are shown
in the below table.
Fig.13. CM-040GE/CM-040GE-RA binning.
The CM-040GE/CM-040GE-RA has ON or OFF function for Vertical Binning:
Setting
Value for Register address 0xA084 Resolution
Frame rate
Off (no binning)
0x01
776(h) x 582(v)
61.15 fps
2:1 binning
0x02
776(h) x 291(v)
111.019 fps.
8.3.2 CB-040GE/CB-040GE-RA. Bayer filter
CB-040GE/CB-040GE-RA is a color camera based on a
CCD sensor with a Bayer RGB color mosaic. The color
image reconstruction is done in the host PC.
The Color sequence in the video signal is the same
for all scanning formats.
The line readout follows LVAL.
The first valid pixel is the same timing as DVAL.
The Bayer color sequence starts with:
GBG for even line numbers
RGR for odd numbers
Figure 14 shows the timing sequence for the Bayer
mosaic read-out for the available partial scan modes
Fig.14. Bayer layout for each scan mode
H
Xsg1
Video out
No V binning
V binning
H
Xsg1
Video out
No V binning
V binning
FVAL Timing
LVAL
DVAL
1
17
24
27
13
9
Full
2/3 Partial
1/2 Partial
1/4 Partial
1/8 Partial
1
Line # from FVAL raising edge
G B
R
G
R
G B
R G
G
R
G B
R G
G
R
Actual V Line #
1
97
145
219
255
G B
R G
G
R
G B
R G
G
R
G B
R G
G
R
6 ck