DDF4820HDV-DN-IM/-SM
www.dallmeier.com
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Noise filter
This setting can improve the image quality by reducing noise in signal processing.
In scenes with lots of complex objects, enabling this function, however, may lead to a loss
of detail in the image.
The noise filter described here can be enabled at all resolutions.
Lens
The camera is equipped with a P-Iris lens.
The P-Iris technology is designed for the precise and automatic adjustment of the ideal
aperture (“optimum aperture”).
Compared with conventional DC auto iris lenses, P-Iris (Precise Iris) attains a significantly
improved image quality with excellent contrast, brilliant clarity and increased detail resolu-
tion with, at the same time, a larger depth of field under almost all lighting conditions.
Especially when monitoring objects in different distances to the camera, such as in ex-
tended hallways, waiting areas or parking lots, maximizing the depth of field is crucial to
the quality of the results of a later image analysis.
In cases of extremely bright lighting conditions, the P-Iris technology prevents the effect
of a so-called diffraction blur (reduction of the overall image sharpness). This effect would
typically occur with conventional DC-controlled auto iris lenses (especially with high-
resolution megapixel cameras, due to a smaller sensor pixel pitch) when automatically
stopping down too far (high f-stop number).
•
Auto P-IRIS
Together with the P-Iris lens, the camera software, first of all, automatically determines
the most ideal compromise (also called “optimum aperture”) between depth of field, lens
resolution and diffraction and, then, continually adjusts the diaphragm opening (aper-
ture) accordingly with a stepping motor.
For best focusing results during the camera installation, P-Iris automatically selects
the widest aperture and, with it, the smallest depth of field. Hence, it is able to achieve
perfect image sharpness regardless of the lighting conditions.
•
Manual P-IRIS
Manual adjustment of diaphragm opening (aperture).
iris
This option is only available when the
Lens
option is set to
Manual P-IRIS
.
•
Normal (50%, slider on left position)
Fixed diaphragm opening (aperture) for largest possible depth of field.
•
Open (100%, slider on right position)
Maximum aperture (diaphragm opening);
useful, for example, under very dark lighting conditions.
