VIVOTEK
66 - User's Manual
-
Quality priority
: Use the slide bar to tune the quality contrast between the ROI and non-
interested areas.
The farther the slide bar button is to the right, the higher the image quality of the ROI
areas. On the contrary, the farther the slide bar button to the left, the higher the image
quality of the non-interested area.
In this way, you may set up an ROI window as a privacy mask by covering a protected
area using an ROI window, while the remaining screen become the non-interested
area. You may then configure the non-interested area to have a high image quality, or
vice versa.
■
Video quality
Constant bit rate:
•
Constant bit rate
: A complex scene generally produces a larger file size, meaning that
higher bandwidth will be needed for data transmission. The bandwidth utilization is
configurable to match a selected level, resulting in mutable video quality performance.
The bit rates are selectable at the following rates:
20Kbps, 30Kbps, 40Kbps, 50Kbps,
64Kbps, 128Kbps, 256Kbps, 512Kbps, 768Kbps, 1Mbps, 2Mbps, 3Mbps, 4Mbps, 6Mbps,
8Mbps, 10Mbps,
12Mbps, 14Mbps, ~ to 32Mbps
. You can also select
Customize
and
manually enter a value up to 40Mbps.
- Target bit rate
: select a bit rate from the pull-down menu. The bit rate ranges from
20kbps to a maximum of 16Mbps. The bit rate then becomes the Average or Upper
bound bit rate number. The Network Camera will strive to deliver video streams
around or within the bit rate limitation you impose.
- Policy:
If Frame Rate Priority is selected, the Network Camera will try to maintain
the frame rate per second performance, while the image quality will be compromised.
If Image quality priority is selected, the Network Camera may drop some video
frames in order to maintain image quality.
• Fixed quality:
On the other hand, if
Fixed quality
is selected, all frames are
transmitted with the same quality; bandwidth utilization is therefore unpredictable.
The video quality can be adjusted to the following settings: Medium, Standard, Good,
Detailed, and Excellent. You can also select
Customize
and manually enter a value.
Maximum bit rate:
With the guaranteed image quality, you might still want to place
a bit rate limitation to control the size of video streams for bandwidth and storage
concerns. The configurable bit rate starts from 1Mbps to 40Mbps (Fixed quality).
You may also manually enter a bit rate number by selecting the
Customized
option.
The Maximum bit rate setting in the Fixed quality configuration can ensure a
reasonable and limited use of network bandwidth. For example, in low light conditions
where a Fixed quality setting is applied, video packet sizes can tremendously
increase when noises are produced with electrical gain.
You should also select the Maximum bit rate from the pull-down menu as the threshold to
contain the bandwidth consumption for both the high- and low-quality video sections in a smart
stream.
