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VIVOTEK
User's Manual - 57
Focus
Focus, also known as Remote Focus, is applicable to Network Cameras that are equipped
with stepping motor lens. The automated focus adjustment function eliminates the needs
to physically adjust camera focus. In an outdoor deployment consisting of a large number
of cameras, the auto focus function can be very helpful when these cameras become out
of focus after days or weeks of operation. And that can easily result from the effects of
natural forces, e.g., shrink and expand due to a wide range of operating temperatures and
the vibration caused by wind.
.
Below is the procedure to perform
the automated Zoom and Focus
function:
1. Use the Zoom slide bar to find
an optimal view of the area of
interest where you want to adjust
its focus. Click and drag the
double-triangle pointer to rapidly
adjust the zoom ratio. The Focus
pointer moves with the Zoom
pointer correspondingly.
2. Select from the bottom of the
screen whether you want to
perform focus adjustment on the
Full view or within a Custom
focus window. You can create
a custom window and click and
drag the window to a desired
position on screen.
3. Click to select the Full-range
scan and/or the Fully-open iris checkboxes. When selected, a full-range scan through
the camera's entire focal length can take about 80 seconds. If not, the auto focus scan
will only go through the length where optimal focus may occur, and that takes about 12
seconds. In theory, best results of the auto scan can be acquired when the camera's iris
is fully open. The iris fully open checkbox is selected by default.
4. Click on the Perform auto focus button, and wait for the scan to complete.
5. After a short while, the clearest image obtained should be displayed and the optimal
focus range achieved. Use the arrow marks on the sides to ne-tune the focus if you are
not satised with the results.
The methodology of using the Resize Buttons at the upper left corner of the streaming
window is the same as that on the home page.