Latency is the time it takes to encode, send, decode and display the video to the operator. We’ll talk more about how H.264 works later in this article. Advanced motion compensation, intra-prediction encoding, and an in-loop de-blocking filter which smooth out the images. The difference in quality can be attributed to a few factors. H.264 takes the benefits of MPEG-4, improves on them and also provides far better quality output making it ideal for security around the home, small businesses or large businesses with mission-critical needs. Without high-quality images a security system is worthless. Image quality is of great importance for any security surveillance application. We would say that it is almost JPEG quality and certainly outclasses MPEG-4, especially with moving objects, particularly in mid-high bandwidth networks. We have taken a look at quite a few IP cameras with H.264 support and can say that the image quality does not from suffer. Of course, the savings in bandwidth and storage space mean nothing if the image quality suffers. This makes H.264 an ideal format to use when designing large systems which require a lot of storage. For example, if H.264 provides a 50% saving over conventional compression methods this would mean you could halve the amount of storage attached to your system or you can retain archives for twice as long. Using H.264 allows you to make cost savings when designing a new surveillance system. This reduces the cost of ownership or allows you to dramatically increase the retention period for your recorded archives. Using H.264 will provide 30-80% total savings on storage space compared to conventional compression formats. The maximum amount of storage space indicates how many days of archive material you can retain at any one time. When designing a new video surveillance system attention has to be made to the amount of storage required for recordings. Having a low bitrate also reduces the file sizes for surveillance recordings. This is ideal for security applications which need a fast frame rate such as casinos, traffic monitoring, object counting (such as vehicles, people) etc. Lowering the bitrate means that more data can be transmitted which increases the transmission rate. In fact, it offers significant reductions, 80% lower than Motion JPEG video and 30-50% lower than MPEG-4. What H.264 offers is a low bitrate for a reduction in bandwidth usage. If you have computers attached to the same network their network connections will become slow and unusable. If your surveillance system uses more bandwidth than is available then you will lose live video feeds and have breaks in your recordings. it's the maximum amount of data you can transfer over your network at any given time.īandwidth is probably the most valuable commodity in networking. Bandwidth is the term used to describe the maximum amount of data which can travel along a specific channel in a fixed amount of time. The bitrate of an IP camera directly affects the bandwidth usage on a network. It can also be known as the transmission speed, transmission rate or data rate. This is typically measured in seconds and expressed as kilobits per second (Kbps), Megabits per second (Mbps 1Mb = 1000Kb) or Gigabits per second (Gbps 1Gb = 1000Mb). The bitrate is the total number of bits travelling between 2 devices at a given point. With conventional compression formats, this just isn't possible but with the introduction of H.264 we can see many benefits which can improve the quality of security surveillance applications. doesn't it?ĭemands from the security industry constantly push for higher resolution monitoring and faster frame rates without any compromise on image quality. We hear bold statements about low bandwidth usage, reduced storage requirements, higher resolution monitoring and better quality images and it all sounds too good to be true. H.264 is fast becoming the standard video compression format for the video surveillance world and if we look at the claims it makes we can see why. The video surveillance industry has adopted the term H.264 and this has become the primary reference to the standard. H.264 is the name used by the ITU-T (International Telecommunication Union) and MPEG-4 Part 10 AVC (Advanced Video Coding) is the name used by the ISO (International Organization for Standardization). Uniquely, H.264 is the first compression format to be formed by collaboration between members of both the IT and telecommunications industries and each have their own name for it. H.264 is an open video compression standard.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |