Axis 231D+ User Manual page 18

AXIS 231D+/232D+ - Configuring the Network Dome Camera
18
Overlay image requirements
Image Formats
• Windows 24-bit BMP (full color)
• Windows 4-bit BMP (16 colors)
• OS/2 4-bit BMP (16 colors)
Advanced Camera Settings
To optimize the lighting settings according to your requirements, modify the following
settings under Lighting Conditions:
• White balance - the white balancing system in the AXIS 231D+/232D+ can
automatically detect white in the image and intelligently use this as a reference
for other colors.
• Exposure control - this setting is used to adapt to the amount/type of light being
used. Allow slow shutter can be enabled/disabled when the exposure control is
set to Automatic.
• IR cut filter (AXIS 232D+ only)- when the IR cut filter is set to OFF, the camera
will be able to 'see' infrared light, e.g. at night, thus making the image clearer.
The image is shown in black & white when the IR cut filter is off.
Note: If set to Auto, the camera will automatically switch between IR cut filter ON
and OFF, according to the current lighting conditions. This is only possible when
the iris is set to Auto Iris, and the exposure control is set to Automatic.
• Backlight compensation - this setting is used to make the subject appear clearer,
e.g. against a bright background.
Image Settings
• Auto focus enabled (default setting).
• Sensitivity - sets the speed of the auto focus. High is used when focusing on
objects that move frequently. Low improves the stability of the focus.
Note:
In certain situations, the white balancing system will not operate effectively. Problems may occur if the
image contains no white color at all, or if the dominant color is not white. In these circumstances, the
white balance may incorrectly be based on another visible color in the image, and colors may become dis-
torted. A pale background picture with reddish or blue foreground objects is very symptomatic of this con-
dition. In such cases it is recommended that a fixed white balance setting is selected.
Image Size
The height and width of the overlay
image in pixels must be exactly
divisible by 4.
Overlay image limitations
• If the image overlay and text overlay are larger
than the video image, no overlay will be dis-
played. When also using a text overlay, this
will occupy 16 pixels in height and as many in
width as the video image.
• If the overlay is initially positioned so that
part of it is outside the video image, it will be
relocated so that it appears over the video
image, i.e. the entire image is always dis-
played.
• The maximum overlay image size supported by
the AXIS 231D+/232D+ is the same as the
maximum image resolution. See Technical
Specifications, on page 46.