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VIVOTEK
86 - User's Manual
Smart Q: Select ON or OFF to enable or disable the feature. Smart Q is scene-aware.
The Smart Q reduces frame size and bit rate consumption through the following:
■
Dynamically adjusting the image quality for scenes in dierent luminosities in low
light frames. Less noises means less of the bandwidth consumed.
■
Endorsing dierent qualities for the I frames and P frames, and hence reduces
the frame size.
■ Dividing a single frame into dierent sections, and giving these sections dierent
qualities. For a highly complex area, such as an area with dense vegetation,
screen windows, or repeated patterns (complex textiles patterns like wall paper),
having a lower quality value actually poses little eects on human eyes.
Unnecessary quality is unrecognized by human eyes and wastes the bit rate.
The Smart Q streaming can save up to 50% to 80% of bandwidth in different
illumination conditions while keeping the same imaging quality. These numbers come
from the comparison between Smart Stream II and Smart Stream III streamings.
■
Bit rate control
Constrained bit rate:
A complex scene generally produces a larger le 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: 20/30/40/50/64/128/256/512/768Kbps,
1/2/3/4/6/8/10/12/14/16/18/20/24/28/32/36/40Mbps. You can also select Customize
and manually enter a value up to 40Mbps.
• - Target quality: Select a desired quality ranging from Medium to Excellent.
- Maximum bit rate: select a bit rate from the pull-down menu. The bit rate ranges
from 20kbps to a maximum of 40Mbps. 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.
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