Video monitoring system and DVR
Digital video surveillance system of digital video recorder (DVR) are rapidly
advanced digital video compression. Most DVR manufacturers to from MPEG4 h.264
high-definition (HD) CODEC, for higher resolution and compression speed also
increased demand. The special chip for high-volume applications (ASSP) is
useful, but lack of flexibility, high cost and developing development for a long
time, Most advanced digital media processor can only execute h. h. 264HD
decoding (and even 264HD coding is much more complex than the decoding. Meet
264HD h. performance requirements of the best solution is to use a FPGA plus an
external DSP processors or digital media.
Using low cost, can provide XilinxFPGA video detecting, movement, color space
transformation, scaling DDR2 memory and disk interface, still can put two
interfaces MHzITU - 27 - RBT656 data flow time transfer to a 54MHz data flow,
and provide video speed for DSP. Will RBT656 - two ITU data flow more road
transport to a RBT656 itu-t data flow, only need a channel video port to
independently complete transmission of video channel. For only a RBT656 itu-t
video input digital media provide interfaces, the processor method is very
useful. Figure 1 is such a suggestion of structure diagram.
Texas instruments for use only one processor (DaVinci company RBT656 itu-t video
input), need a DVR design more effective method of two or more data flow RBT656
itu-t time transfer to a VLYNQ data flow, and then can be transported to the
DaVinci processor. Using the method, you use less of the I/O foot can transmit
video, but also can reduce cost, because the device can become smaller packages.
PC card DVR system extension
Over the past decade, PCI bus for PC offers good service. Today, however, the
expansion of the PC card DVR system requires bandwidth, has greatly exceeded the
PCI bus power level. Uncompressed video data (divest blank frame about 165Mbps
after). So, in general 1Gbps bandwidth for PCI, under the situation of you in a
PCI bus can mix six uncompressed video collection or video playback equipment.
You can use the card MPEG4CODEC chipset to narrow the bandwidth of the bus, but
it will increase the cost, and make your existing MPEG4 chipsets are restricted.
PCIExpress (PCIe) technology to flow. PCIExpress decomposition for multiple
channels. Each channel in every direction contains a difference to the direction
of flow of data each difference for 2Gbps. Each of the motherboard PCIe slot has
its own channel, these passages are not Shared with any other slots. Each slot
allocation for 16 channel (also called x16), 8 channels (x8), 4 (1) or (x4
clamps its x1). PCIe allows each card to provide the data from the 2Gbps x16
clamps its x1 channels to 32Gbps channels. A PCIe data flow, you can get rid of
each PCI card six uncompressed video channel.
Through the use of digital media processor and PC to replace the PCIe bus will
cache the video to a PC, easier and faster expansion DVR system PC card. Video
adc produces four independent digital ITU - RBT656 flow, and then flow into the
low cost of Spartan - 3 pretreatment devices. In the video, data on FPGA strip
blank frames and synchronization, as appropriate, then PCIe pack XilinxPCIe fed
into the kernel. Then, the software can read and broadcast video input, and
carry on the processing, or stored in the disk.
