OPERATING INSTRUCTIONS
1.1 Iris Control (Shutter Speed)
The Iris setting is used to control the image inten-
sity in varying lighting conditions. It works by vary-
ing the integration time of the camera, which is
measured in fractions of a second, and is analogous
to the shutter speed on a conventional camera. The
shutter speed is set by Dip Switches 1-4, according
to Table 1.
TABLE 1
The flickerless mode is intended for use in environ-
ments illuminated by fluorescent lamps. These
lights can cause excessive flickering of the image if
the shutter speed is not set appropriately.
In the Electronic Iris mode, the integration time of
the camera is automatically adjusted according to
the level of illumination.
1.2
Contour Enhancement
The contour enhancement is used to increase the
sharpness of the image, by slightly exaggerating
the boundaries between light and dark areas of the
screen. It may give rise to image artifacts depend-
ing upon the scene content, and the appropriate
setting is best established by experimentation.
The contour enhancement is enabled via Dip Switch
#5 (On).
1.3 Gamma
The gamma control defines the overall transfer
function of the camera. That is the relationship
between the incident light intensity and the
amplitude of the video output signal. A gamma of
1 defines a linear relationship, and is best suited
for use with image capture devices. A gamma
setting of 0.45 is used to offset the non-linear
response of the phosphors used in video moni-
tors, and this should be used when viewing the
camera on such a monitor.
The gamma is selected Via software control or
Dip Switch #5 (ON = .45, OFF =1)
1.4 Synchronization
There are synchronization modes, selectable via
Dip Switches 7 and 8.
In mode 1, the camera timing will be derived
from the internal crystal or lock to externally sup-
plied H and V pulses (Master Mode).
In mode 2, the camera timing will sync. to exter-
nal H and V pulses. See Application note “APN-
20D479”, section 4.3 for more information on
external synchronization.
1.5 White Balance
The camera has 2 white balance modes. AWB (auto
white balance) allows the camera to adjust white
balance based on the scene.
Push to set (PUSH) sets the white balance to fixed
values determined at the time the button is
pushed.
1.6 Gain Control
The camera can be set to Automatic Gain Control
(Dip Switches 9 and 10 Off) whereby the gain of
the camera will be varied in response to changes in
the average level of illumination.
Alternatively, the gain can be set to one of three
fixed values as defined in the table below.
1.7 Mirror Mode
This option is used to perform a mirror inversion of
the camera image, and is used when the camera is
viewing the object via an external mirror. The mir-
ror mode is enabled by setting Dip Switch #11 to
the ON position.
1.8 Non Interlace Mode
In the normal mode, the camera outputs thirty full
frames per second. Each frame is comprised of
two interlaced fields, each containing 262 lines.
The presence of the interlace can cause problems
when capturing images of moving objects, due to
the temporal separation of the fields. In the non
interlaced mode, the camera outputs two identical
fields per frame. In the non interlaced mode, the
vertical resolution of the image is reduced by a fac-
tor of 2.
Shutter Speed
Dip Switch
20D779
21D779
1
2
3
4
1/60 sec. (max) 1/50sec. (max) Off On On On
1/100 sec.
( Flickerless)
1/120 sec.
( Flickerless)
Off On On Off
1/250
Off On Off On
1/500
Off On Off Off
1/1000
Off Off On On
1/2000
Off Off On Off
1/10000
Off Off Off On
1/20000
Off Off Off Off
Electronic Iris
On
x
x
x
Dip Switch
Sync Mode
8
Mode 1. Master (Internal Sync.)
Off
Mode 2. Slave
On
Dip Switch
White Balance Mode
7
Mode 1. AWB
On
Mode 2. PUSH
Off
Dip Switch
Gain Setting
9
10
AGC On
On
On
0 dB
On
Off
6 dB
Off
On
12 dB
Off
Off
06/12/07 INS-20D779 REV A
