HD monitoring storage bottleneck H.264 encoding standard for unified

Video surveillance with technology development, in particular with the rapid development of computer technology and the promotion, all-digital network video monitoring system has been gradually replace traditional analog surveillance system has become the mainstream of video monitoring system.

Video monitoring gradually from digital, analog to network, HD, intelligent direction. Security monitoring industry will strongly encourage the use of megapixel camera, but its biggest challenge is the need for more large amounts of storage space and huge bandwidth costs.

We have analyzed, to the most basic of megapixel camera acquisition 720P as a standard, normal hourly videos need some hard disk capacity as 4G ~ 8G/hour, for economic reasons, to lower per-hour video recording can be compressed to about capacity 3GB.

Thus, for example, according to a calculation, save time, 8-channel monitor approximately 17T (17000G) capacity, thus converting only the hard drive price million, not to mention to 1080P collection of astronomical capacity.

Despite the powerful hardware devices we, but the overall situation in HD monitoring, storage space and bandwidth in occupies all of a sudden become difficult challenges, how limited hardware to achieve high definition monitor storage?, of course, the simplest and lowest cost is reasonable choice of video encoding, currently available three stream high definition network camera, supports JPEG/MPEG-4/H.264 three different video compression format, you can according to customer's actual situation set these three code stream.

Today's networks HD camera see encoding compression method:

JPEG、MJPEG

JPEG compression technology is all image compression technology.

It is suitable for a static image compression, work directly with the whole picture, the compression ratio of 20-80 times the resolution have no choice. So you want to wait until the entire compressed file transfer is complete before beginning to decompress it into a picture, but this resulted in a high resolution picture transmission shall take tens of seconds or even minutes for real-time video compression, but is more suitable for alarm crawl, you can restore the sharpness of the image, this is a video compression is not available.

MPEG-4

Currently, MPEG-4 is mainly applied in three areas: digital television, interactive graphics applications (including content synthesis technology), interactive multimedia applications.

MPEG-4 provides standard technology so that it can be integrated into the product, category, content access, and other processes. In high definition surveillance field coding technology is mature, low requirements to hardware acquisition and compression efficiency.

H.264

Moment, H.264 HD monitoring coding most use value, relative to MPEG2, MPEG4, the compression efficiency is three encodings in the highest, higher data compression ratio.

In the same image quality, h.264 compression ratio than current DVD system using MPEG-2 to 3 times higher than MPEG-4 1.5 ~ 2 times. That is why, after h.264 compression of video data in the network transfer process requires less bandwidth, and more economic. 720P coding in MPEG-4 need 6Mbps transfer rates match the H.264 only need 3Mbps or transfer rate, but H.264 decoding algorithm is more complicated, encoding performance requirements more stringent and, of course, low-bit-stream can guarantee full real-time high-definition picture quality is M-JPEG and MPEG-4 compression method.

Summary:

HD megapixel network camera is the current digital video comparison of the leading products, high quality, full-function, should belong to the high-end products in the industry.

But this kind of camera because of network resource consumption, different system compatibility, equipment prices and other reasons not yet lead to the market more attention. H.264 as a next-generation video compression standard, is expected in the next few years will become the industry standard of choice for video, this standard has been successfully applied to mobile phones and digital video players and other electronics products. For the video surveillance industry, H.264 can reduce storage costs, improve the overall efficiency, thereby further expanding video surveillance application potential of high definition.