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53
USER MANUAL
Parameters Specific to MP3-DN DAY/NIGHT Cameras
MP3-DN camera utilizes two distinct sensors for its day and night modes.
Specifically, 3-Megapixel color sensor with IR-cut filter is used in the day mode,
while 1.3-Megapixel monochrome sensor without IR-cut filter is used in the night
mode.
As MP3-DN camera has two sensors with different resolutions it is most
convenient to specify the required image size in terms of percentages of the full
image size as shown in the following example:
HTTP://200.168.1.10/image?res=full&x0=0%&y0=0%&x1=100%&y1=100%&qu
ality=12&doublescan=0
By default, the camera automatically switches between day and night channels
as illumination changes. However, it is also possible to force the camera to
operate in either day or night channel by using
daynight
request. The switch
point between day and night modes is determined based on overall AE/AGC
gain and can be adjusted via parameter
nightgain
. To avoid oscillations between
day and night modes, the night-to-day transition is specified via parameter
daygain
in terms of “hysteresis” relative to day-to-night transition threshold.
•
daynight
‒ if set to “auto” the camera will select between color and
monochrome channels automatically based on
daygain
and
nightgain
thresholds
(valid values are “auto”, “day” and “night”)
•
nightgain
‒ allows to specify the automatic switching point for day-to-night
transition in proportion to overall exposure*gain value; The user may need
to adjust this value if the lenses on day and night channels have different f-
stops; Higher values will cause the transition to night mode at lower
illumination level (valid values are from 0 to 18)
•
daygain
‒ allows to specify the automatic switching point for night-to-day
transition as “hysteresis” relative to night-to-day transition; Higher values
will cause the transition to day mode at higher illumination level (valid
values are 0 to 6, 0 is not recommended)
