Vivotek FD8371EV User Manual download pdf (Page 57)

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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 satised 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.

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Vivotek FD8371EV User Manual Page 57