Focus Assist Mode; Network Requirements - JVC VN-X35U Instructions Manual

VN-V25U_26U_EN.book Page 24 Wednesday, September 3, 2008 8:03 PM
Connection / Installation

Focus Assist Mode

The accuracy of focus adjustment is improved
when the iris of auto iris lens is open.
[MONITOR OUT] Switch
MONITOR OUT
STATUS
[STATUS] Indicator
1.
Set the [MONITOR OUT] selection switch
to NTSC or PAL
2.
Press the [RESET] button for
or longer, and release within
Doing so switches to the Focus Assist
mode.
● [STATUS] indicator alternates lighting up
in green color and orange color
repeatedly.
● The central portion of the image is
enlarged.
3.
Shoot the object or a fine pattern that is
farther away than the object
4.
Adjust the lens focus
5.
Set the [MONITOR OUT] selection switch
to AOFFB
6.
Press [RESET] button for less than 2
seconds to restart
● Focus assist mode is disabled.
● It takes about one minute for the camera
to reboot.
● While rebooting, the [STATUS] indicator
lights up in orange.
Memo:
● After focus adjustment, press [RESET]
between 2 to 5 seconds to exit focus assist
mode.
● You can also enable the Focus Assist mode
on the viewer.(A Page 93)
24
PAL OFF NTSC RESET
IRIS
2 seconds
5 seconds

Network Requirements

● Ensure that there is sufficient network
bandwidth for the data volume to be sent out
by VN-X35U. Do not send multicast stream
that exceeds the bandwidth. If the entire
bandwidth is used by the multicast stream,
control of this camera via the network may fail.
● Data volume to be sent by VN-X35U varies with
the settings and number of distributions.
● The maximum bit rate for transmission is
about 20 Mbps.
Estimation of Total Bit Rate
The total JPEG bit rate from VN-X35U is
determined by the VN-X35U settings, number of
clients, and the client's requested number of
frames. The total MPEG4 bit rate from VN-X35U
is determined by the number of distributions.
Develop a design upon taking the above into
consideration.
Bit Rate of JPEG Stream
The JPEG file size per frame varies with the
encoding settings as well as input video signals.
The following table may be used as a reference.
When VFS is selected, the quantization table
during JPEG encoding will be maintained, and the
file size will increase/decrease according to the
input signals. When AFS is selected, encoding will
be performed such that the target file size is the
average size of multiple JPEG images.
Picture Quality Quad
Control Method
VGA File
Size
VFS 1 (High) 180 KB
(Variabl
2 160 KB
e File
Size)
3 140 KB
4 120 KB
(Medium)
5 100 KB
6 80 KB
7 (Low) 60 KB
Selectable
AFS
between
(Average File
40 KB to
Size)
200 KB
VGA File QVGA File
Size Size
80 KB 27 KB
60 KB 20 KB
40 KB 13 KB
30 KB 10 KB
25 KB 8 KB
20 KB 7 KB
15 KB 5 KB
Selectable Selectable
between between
10 KB to 3 KB to
100 KB 33 KB