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User’s manual
56
Exposure
: Exposure is the key you can decide the image quality with.
Exposure setting is highly dependant to the ambient light
(type and intensity), and sometimes will need for different
setting from one situation to another.
In this section you have 3 items that can change actual
exposure and 3 others are for image quality modification:
z
exposure factor:
iris, shutter, sens-up
z
image quality factor: brightness, AGC, SNR
Some of these factors are conflict to each other in certain
modes; refer to OSD table 4 for the details.
Brightness: Human eyes are more sensitive to brightness than other
image factors, meaning that brightness control is the most
important video quality factor to us.
Brightness is very personal subjective, therefore you need
try the adjustment with your system and the eyes of your
own.
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reminder: brightness control is also available on most display.
Check your display to ensure the monitor has correct
brightness setting.
Iris : Iris is one major mechanisms for exposure level control,
besides shutter speed.
Iris is the window for light to pass onto CCD (sensor), so the
size of it will determine the energy of light can reach CCD at
a time. Therefore, bigger iris provides brighter image, while
smaller iris will give darker picture.
Iris options are AUTO and MANUAL;
suggestion: AUTO is more recommended for most conditions,
unless you have particular environment (such as indoor
with stable lighting), because it adapts better to the
changing ambient illumination.
note: While iris is in auto mode, it has the priority for
exposure control. Shutter speed will be fixed, (“---“on
shutter) unless you manually apply shutter with other
setting.
note: Manual control allows you to adjust iris size from
complete closed (“0”) to fully open (“100”).
If you set iris to “manual”, then shutter takes over the
priority position for exposure control (seeing “ESC” on
shutter setting).
Summary of Contents for CAM-ISD52
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