Axis IP-Surveillance system Design Manual page 29

> Avoid direct sunlight
Direct sunlight should always be avoided. Direct sunlight will "blind" the camera and can reduce the
performance of the image sensor chip. If possible, position the camera with the sun shining from
behind the camera.
> Bright areas in the images should be avoided as they might become overexposed (bright white) and
objects can then appear too dark. This problem typically occurs when attempting to capture an object
in front of a window. To solve this problem, simply reposition the camera or draw the curtains and
close blinds if possible.
Figure 3.e. Avoid very bright areas in an image
by changing the camera position.
> Contrast
In outdoor environments, viewing too much of the sky results in too much contrast. The camera will
adjust in order to achieve a proper light level for the sky. Consequently, the object/landscape of
interest will appear too dark. One way to solve this problem is to mount the camera high above the
ground, using a pole if needed. In advanced network cameras, users may be able to set which part of
an image should be more correctly exposed.
> Lenses
An auto iris lens should always be used for outdoor applications. An auto iris lens automatically
adjusts the amount of light that reaches the image sensor. This optimizes the image quality and
protects the image sensor from being damaged by strong sunlight.
Figure 3.f. Advanced cameras include
the feature to compensate for backlight.
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