The arrival of quality and demand in the era of video surveillance HD is a major demand point

Nowadays, the voice of "the era of high-definition video surveillance has arrived" sounds everywhere. From manufacturers to distributors, to engineering companies and integrators, they have put forth 12 points of ability to contribute to the arrival of the high-definition era. Then, after that, people will find that the advent of the high-definition era has made everyone hastily and uncomfortably. The reason is that quality and demand have become the biggest appeal points.

People's understanding of "HD" is not the same, directly resulting in a variety of high-definition products in the market, the standard is not the same.

The pixel resolution is confused with the concept of the number of pixels, and it also allows camera manufacturers to play “Tai Chi” when promoting HD cameras. The real HD also needs to advance with the times and develop together. The high-definition video surveillance is the mission of every member of the “monitoring family” of video surveillance systems, and it is also the mission of the security industry. It is not only the front camera, but also the joint efforts of transmission, display, storage, and standards.

Therefore, we believe that the high-definition video surveillance cannot be blindly pursued or suppressed. Technological innovation, market progress, will be able to see joy through pain. We hope that in the near future, the high-definition video surveillance will be between ideals and reality. There will be no surprises, only surprises.

Confusion about the concept of “HD” At present, there are many “HD” camera products on the market. Many manufacturers have advertised their own cameras with high definition, which can reach megapixels or 540 lines or more. At first glance, such a large number of products achieve high definition, and it should be a joyous thing. But when you look closely, you can suddenly make people's minds chaotic, but they are not sure what exactly HD is. So, what is "high definition"? Is it really the same thing that many video camera manufacturers claim "HD" and true video surveillance "HD"? With such doubts, we began the investigation of the "HD" and "Pseudo-HD".

The “HD” difference between analog and IP cameras Many manufacturers in the market say “HD”. In fact, the high resolution of analog cameras is confused with the high resolution of IP cameras. Their measurement standards are not consistent. According to Guan Yuyu, director of market planning department of Panasonic (China) Co., Ltd., a system solution marketing company, analog "HD" is actually a high-definition abbreviation. Currently, HD camcorders generally refer to 540 lines and above. Horizontal definition product.

Panasonic's SD5 generation products have reached 650-line horizontal resolution. In a single-CCD camera, they have reached the limits of analog cameras.

The camera is different, in theory, there is no limit on the upper limit of its definition, and the standard for measuring the resolution of the IP camera is consistent with the standards of the radio and television industry. Among them, the SD resolution is 852×480; the HD resolution is 1280×720; The HD resolution is 1920×1080. The standard of the IP camera definition is like the photograph we take. The high-resolution photo image is still clear after zooming in. The low-resolution photo is blurred after zooming. From Table 1, we can see the number of pixels corresponding to different resolutions in SD, HD, and HD formats, which helps greatly in understanding pixel resolution and number of pixels.

Megapixel does not mean that Li Ziming, HD sales director of Axis China, told reporters that megapixels is HD, and the higher the pixels, the better. This is a conceptual misunderstanding. True HD video surveillance or HD IP cameras are IP cameras with HDTV logos and meet SMPTE (Society of Motion Picture and Television Engineers) standards. Among them, the HD IP camera resolution must reach 1080i or 720p, and in high resolution, 16:9 display mode can achieve full frame rate.

It is understood that the two HDTV standards defined by the Society of Motion Picture and Television Engineers (SMPTE) are SMPTE 296M and SMPTE 274M. SMPTE 296M (HDTV 720P) defines a resolution of 1280 x 720 pixels, high-fidelity color in 16:9 format, 15/30Hz sequential scanning frequency, ie 25-30 frames per second, depending on country, also supports 30/ 60Hz scanning frequency, ie 50/60 frames per second.

(HDTV 1080) The defined resolution is 1920 x 1080 pixels, high-fidelity color in 16:9 format, using 25/30 Hz and 50/60 Hz interleaved or sequential scan frequencies. SMPTE compliant cameras are compliant with HDTV quality and should provide all HDTV resolution, color fidelity, and frame rate advantages. Therefore, purely sought after high resolution cannot provide high quality HD video images. As can be seen from Table 2, the standard high-definition is more suitable for security monitoring, so the high-definition is the basis of video surveillance. At present, according to the relevant definitions of the Society of Motion Picture and Television Engineers (SMPTE), the International Telecommunication Union (ITU) and China’s national radio and television, there are currently three main types of real HD video formats: 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). Among them, 1080P is the highest standard of HD video definition.

HD monitoring requires "unified action"

With the development of the Internet and the popularity of networking, high-definition in the field of monitoring has become an indispensable part of people's lives, and the trend is very clear. High-definition surveillance was born on the Internet. Without the popularity of network surveillance, it was difficult to achieve high-definition image storage and transmission. At the same time, the network also gave distinctive features to high-definition surveillance systems.

In the field of video conferencing, LifeSize introduced the industry's first 720P product since 2006, and later Kodak launched the industry's first 1080P product. High-definition has long been used, and has become the current main market. In the field of video surveillance, the impact of various factors, high-definition has just begun, and the advent of networking is to promote this process. Although many companies are promoting high-definition network monitoring systems, megapixel high-definition network cameras and their supporting products are still emerging products. Many users do not know what effect HD is. It is no wonder that users have doubts about the application of high-definition network monitoring, such as: HD network cameras will not be unstable, the cost will not be much higher than the analog device, whether the bandwidth investment will increase exponentially, the amount of data increase storage Solution, how HD shows monitoring, what kind of platform for centralized management and so on.