CV-M77
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6. Functions and Operations
6.1. Basic operation modes
Apart from the standard continuous operation mode, the CV-M77 features four external
triggering modes and a long time exposure mode. In all modes the camera can be synchronized
to an external sync. The shutter time can be selected from 12 fixed steps, or from 788 steps
with 1H resolution. In triggered mode it can also be controlled by the trigger pulse width.
The frame delayed readout can operate in either edge pre-selected trigger, or pulse width
controlled shutter mode.
Switches can set most modes and functions locally. All modes and functions can be remote
controlled by RS-232C control.
Alternative connections for input and output signals can be done by internal jumpers.
For details: refer to “7. Configuring the Camera”.
6.1.1. High frame rate.
From revision C, the CV-M77 camera has a new readout mode. It is the high frame rate mode.
Here only every third line is read out. The 2 lines between are dumped. In this way the Bayer
RGB mosaic pattern is unchanged. The DSP interpolation algorithm for RGB color output can still
be used.
The figures below shows the CCD sensor in normal mode and high frame rate mode. In high
frame rate, the vertical ccd register is clocked with 3 times higher rate. But only the signals
from every third line is transferred to the horizontal ccd register for read out. Signals from the
lines between are dumped.
The horizontal resolution is unchanged, but the vertical resolution is reduced to 1/3.
The advantages are:
Frame rate 3 times higher
The image is sampled from the whole sensor area
Horizontal resolution unchanged
Xsub
Horizontal ccd register
R
G
B
Video
coder
Vertical ccd
register
Shutter
Photo diode
(pixel)
Xsg1
G
G
G
G
G
G
G
G
G
R
R
R
R
R
R
B
B
B
No
rmal
V-
cl
oc
k
Hi
gh
f
ra
m
e r
at
e V
-c
lo
ck
Xsub
Horizontal ccd register
Video
coder
R
G
B
Vertical ccd
register
Shutter
Photo diode
(pixel)
Xsg1
No
rmal
V-
cl
oc
k
G
G
G
G
G
G
G
G
G
R
R
R
R
R
R
B
B
B
Xsub
Horizontal ccd register
R
G
B
Video
coder
Vertical ccd
register
Shutter
Photo diode
(pixel)
Xsg1
G
G
G
G
G
G
G
G
G
R
R
R
R
R
R
B
B
B
No
rmal
V-
cl
oc
k
Hi
gh
f
ra
m
e r
at
e V
-c
lo
ck
Xsub
Horizontal ccd register
R
G
B
Video
coder
Vertical ccd
register
Shutter
Photo diode
(pixel)
Xsg1
G
G
G
G
G
G
G
G
G
R
R
R
R
R
R
B
B
B
No
rmal
V-
cl
oc
k
Hi
gh
f
ra
m
e r
at
e V
-c
lo
ck
Xsub
Horizontal ccd register
Video
coder
R
G
B
Vertical ccd
register
Shutter
Photo diode
(pixel)
Xsg1
No
rmal
V-
cl
oc
k
G
G
G
G
G
G
G
G
G
R
R
R
R
R
R
B
B
B
Xsub
Horizontal ccd register
Video
coder
R
G
B
Vertical ccd
register
Shutter
Photo diode
(pixel)
Xsg1
No
rmal
V-
cl
oc
k
G
G
G
G
G
G
G
G
G
R
R
R
R
R
R
B
B
B
CCD with normal readout.
CCD with high frame rate readout.