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7. APPENDIX
7.1. TERMS
Dual-stream
Dual-stream: one high bit rate stream for the local HD store, QCIF/CIF/2CIF/DCIF/4CIF coding, other low bit rate stream
for network transmission, such as QCIF / CIF coding,
I Frame
I frame: intra frame image, remove redundant information to compress the transmittal data, also called key frames.
B Frame
B frame: According t ti
d d t f th
i
i
l
d d f
d
t the source
image afte
P Frame
P-frame: ac
called
predicted f
Wide Dyn
Bright parts and dark parts in particular can be seen very clearly at the same time. Wide dynamic range is a ratio between
the brightest luminance signal value and the darkest value.
S
.
M
.
A
.
R
.
T
SMART (Self Monitoring, Analysis and Reporting Technology): now widely used in hard disk data security technology,
monitoring system analysis Motor, circuit, HDD and disk head when HDD working, warn when abnormality, sometimes will
automatically slow down and back up data.
CVBS
Composite Video Broadcast Signal, consists of luminance and color signal from the composite baseband signal.
BNC
Coaxial cable connector, composite video signals or audio signals, commonly use 75 ohm connectors. BNC welding and
should pay attention to weld strength and remove burrs, or the signal wire and shield’s contact will lead to a substantial
attenuation of signal strength.