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Network Camera User Manual
63
Chapter6.
APPENDIX
6.1.
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.
Dual-stream can achieve two different bandwidth stream requires of local transmission and remote
transmission.
Local transmission with high stream can get a higher HD video storage and remote transmission use lower
stream to adapt to the CDMA / ADSL or other network to obtain higher image fluency.
I Frame
I frame: intra frame image, remove redundant information to compress the transmittal data, also called
key frames.
B Frame
B frame: According to time redundant of the source image sequence previously encoded frame and
account the source image after the encoded frame to compress transmittal data, also known as
bi-directional prediction frame.
P Frame
P-frame: according to image frame lower than the previous ’time redundant to compress transmittal data,
also called predicted frames.
Wide Dynamic
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.