The network is the basis of high-definition monitor

The traditional standard definition monitor is divided into three types of analog, digital and network. The analog monitor the front-end analog cameras, back-end matrix. Front-end is also a simulation of digital surveillance cameras, back-end DVR. There are two front-end network monitoring, an analog camera + video encoder, a network camera, the back-end platform. In other words, the SD monitoring times, the front of the various types of analog cameras, network cameras, video encoders + analogue cameras.

To the era of high-definition monitor, front-end must be a high-definition network cameras. The main reason in two ways:

The first, high-definition monitor certain network must be based on video compression and transmission over an IP network, because the only way to control the cost of high-definition video transmission.

After collection of uncompressed HD video signals, both analog and digital transmission. Analog transmission generally use the YPbPr component transmission and high-definition video signals all the way simultaneous transmission of three coaxial cables. Digital transmissions generally use DVI, HDMI or HD-SDI transmission, only a few meters transmission distance in which the DVI or HDMI, not suitable for monitoring the transmission, while the HD-SDI can transmit about 100 meters high, but the requirements of the coaxial cable cable price is also very expensive. Whether it is analogue or digital transmission of uncompressed high-definition video signal transmission costs are significantly higher than the previous analog standard definition video signals. The use of video coding and transmission over IP networks, high-definition video and standard definition video on the transmission cost differences are small.

Second, high-definition network camera front-end processing efficiency and cost advantages to be more than high-definition video encoder + Camcorder - Pro.

The current high-definition video sensor CMOS, the CMOS sensor output digital video signal in the camera through the DSP or ASIC digital high-definition video signal compression, and then transfer to a network, than the camera directly output HD signal more economical, and processing more efficient

A uniform technical standards for HD monitoring the development of necessary conditions

HD are still in the initial application, the industry many of the concepts for high-definition is not uniform, the technical standards are different. To achieve the popularity of high-definition monitor, standardization is also very necessary. On the issue of the standardization of high-definition, the first is the video resolution and video coding standardization.

First of all, on the video resolution standards. At present, the industry there are two concepts on high-definition monitor resolution, megapixel and 720p/1080i/1080p resolution of these two standards is the HD. 720p/1080i/1080p from the HDTV standard developed by the American Film and Television Engineers (SMPTE). According to the standard, truly meet high-definition video format has the following three:

720p: 1280 * 720 resolution, 16:9 widescreen display, progressive scan / 60Hz

1080i: 1920 * 1080 resolution, 16:9 widescreen display, interlaced / 60Hz

1080p: 1920 * 1080 resolution, 16:9 widescreen display, progressive scan / 60Hz

In addition, the standards defined in detail for each resolution, frame rate and other data. Therefore, to meet any given HDTV standards HD network camera must support one or more specific resolution, frame rate and color fidelity, which has always been able to ensure that the required video quality.

Megapixels is not a recognized standard, it is only the concept of the representative of an industry best practice, specifically referring to the network camera's image sensor element number. In other words, when we heard a high-definition network cameras that support megapixels, 20 megapixels or 50 megapixels, we do not know the camera frame rate is how much the video aspect ratio, interlaced or progressive color how fidelity, and this information is also a measure of an important reference of a high-definition network camera performance

Therefore, we can see 720p/1080i/1080p is the video resolution of standard mainstream.

Second, the standard video coding technology. Video encoding is a critical parameter for high-definition network camera, which determines the image quality of video transmission and the need for network bandwidth. We are currently seeing high-definition network camera video coding standard MJPEG and H.264

MJPEG (Motion JPEG) JPEG developed on the basis of the dynamic image compression technology, the only separate a frame compression, and basically does not consider the changes between the different frames in the video stream. To obtain video images of the definition of high compression technology, and the flexibility to set the video resolution in every way, and compressed frames, and the compressed picture can be any splicing. Its defects are also very obvious: a serious frame dropping, real-time, under the premise to ensure that each must be clear, it is difficult to complete real-time compression; Second, the compression efficiency is low, transmission bandwidth and storage space

The perfect solution is high-definition monitor the popularity of the premise

H.264 is the ITU-T and ISO jointly formed by the JVT Joint Video Team to develop a new generation of video coding standards, the goal of the video used to achieve high compression ratio and high image quality, good network adaptability. Than MJPEG, H.264 not only save more than 80% of the bit rate, and has better support for network transmission. H.264 introduces the encoding mechanism for IP packet, the packet transmission network, support network video streaming, video coding transmission support different network resources to obtain a smooth image quality. H.264 can lower the bandwidth of 720p, 1080i / p broadcast high-definition video resolution.

MJPEG can get the better the quality of a single image, but because it had a fatal flaw in the movement, bandwidth and storage space, therefore, to adapt better to the development needs of high-definition monitor, H.264 is clearly an advantage.

The development of the video surveillance industry, all the technology must be conducive to industrial standardization and harmonization should be the first necessary condition, because the analog control products is precisely because there is no uniform industry standard, and makes the manufacturers of their own way, each manufacturers have adopted their own standards, resulting into the network era, users face obstacles when the network monitoring system, and many of the core needs. HD monitor era, the standardization of technology will be the focus, in addition to the above two technical standards, including device discovery, real-time video, audio, metadata and control information between network video devices to exchange information will uniform definition of scale and standardization will become an important symbol of high-definition monitor era.

The perfect solution is a popular premise of high-definition monitor

The past two years, HD can be a hot topic in the surveillance industry, the industry's major mainstream manufacturers have launched their own high-definition products, especially Camcorder - Pro, more models, an array. However, in terms of high-definition monitor, just a Camcorder - Pro or a single high-definition equipment can make applications? To figure out this problem we can take a look at traditional video surveillance system framework: either analog control or digital control or network monitoring, they are located in the front part of the surveillance cameras, NVR / DVR / management platform of the center management device decoding display device, and storage devices, transmission cables, etc. constitute the framework of the basic system, are indispensable. , HD monitoring system must be so, Camcorder - Pro or any other single high-definition equipment is clearly impossible to achieve real practical applications, high-definition monitor with the actual application of significance, it is necessary that the traditional monitoring system, to provide cover front-end , transmission, management center and back-end aspects of a complete solution

The series of products is an important factor for market applications

HD monitoring the deployment of cost is how much higher than standard definition, the scale of the deployment of high-definition monitoring system vary in size from a few road to dozens of road, 100 road have, therefore, can choose to meet the demand for products effective control of costs will affect the high-definition monitor the degree of market applications