Zkteco ES-854N11H [48/49] Appendix

6 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.