With the improvement of information technology, people have higher and higher requirements for visual appreciation. "Visual impact" has become a standard for people to judge performance. Visual impact not only comes from a clear picture, but also comes from an oversized picture. In order to meet this demand, large-screen splicing came into being. In addition, the edge fusion technology based on projection technology can be realized for large screens. Judging from the current situation, in terms of the application of large-scale images, the technologies are "all eyes" and play different advantages in different fields.
The development direction and prospects of high-definition First, let's look at the development of ultra-high-definition technology. Japan has developed UHDV, an ultra-high definition video system with a resolution of 7680x4320 pixels in the 1990s, and the picture quality is incredible. Because the scanning line can reach more than 4000, the new system is named 4000 (4K line) scanning line ultra high-definition video system. Ultra-high definition is based on high-definition development and its resolution is 16 times higher than the most advanced HDTV on the market. Of course, the new generation of ultra-high-definition is mainly designed for large-screen TVs or TV walls, because on conventional-size TVs, the quality of the images brought by ultra-high-definition TV technology cannot be discerned with the naked eye. In the field of security monitoring, 16 million-pixel IPC with JPEG2000 coding technology has been introduced, and it can achieve ultra-high resolution of 4872×3248.
Second, the development of laser display technology. After experiencing the era of black and white, color and digital high-definition display, display technology will usher in an era of large color gamut display. The three-gun CRT allows the display product to move from a black and white display to a color display, which better reproduces the objective world. With the development of digital technology, high-resolution video image compression, transmission and decoding technologies are widely used in the field of imaging. Video signals are also converted from analog signals to digital signals, thus solving the problem of high-resolution picture transmission bandwidth and picture stability. problem. However, due to the limitations of the display light source, the first three generation display technologies can only reproduce 30% of the color space that can be recognized by the human eye, so that 70% of the colors cannot be perceived by people through the display, so the true reproduction of colors is the next generation display. key. The laser display technology is a display technology using red (R), green (G), and blue (B) three-primary lasers as a light source, which fully utilizes the characteristics of laser wavelength selectivity and high-spectral brightness, so that the display image has a larger The color space expression space can reproduce the rich and colorful colors of the objective world most realistically, and provide more powerful performance. Laser display color gamut coverage of up to 90%, color saturation is more than 100 times the traditional display, and at the same time fully inherited high-definition digital digital era features such as digital signals, to achieve the most perfect human color reproduction ever. China's laser display technology research is a national 863 project, and it is currently synchronized with the world in technology. It is estimated that after 2010, laser display will be available soon.
Thirdly, the development of high-definition technology will promote the development and application of image recognition and intelligent analysis technologies. The well-known image recognition and intelligent analysis technologies have not been widely applied in the industry. The main reason is that the accuracy of recognition is not a small gap from the user's expectation, and the resolution of the image is the main factor affecting the recognition accuracy. The use of high-definition monitoring technology and large-scale market applications will be for image recognition and intelligence. The popularization and application of analytical technologies bring unprecedented opportunities. For example, the application of face recognition technology is mainly applied to occasions such as specially designed entrance and exit channels, and only one face can be recognized at a time. The application of high-definition monitoring technology will greatly increase the recognition efficiency and expand the application occasions, such as urban security. Monitoring, banking hall monitoring, station square monitoring application.
In addition, it should be noted that the requirements for security monitoring and television screen images are very different. For example, in terms of the content of the screen, TV pays attention to good looks, rich colors, and spectacular scenes; while monitoring requires real images, and the objects of concern are meticulous and observable, and do not pay attention to good-looking or unsightly. The 16:9 aspect ratio is the same target for HDTV standards at home and abroad. It is in line with the golden section and is also comfortable to human eyes. However, security monitoring needs attention to the scene and the target, and reflects the details of the behavior. Whether 16:9 really meets the needs of the surveillance scene is still worth discussing. At present, the domestic security industry does not have a definition of high-definition monitoring standards, and many manufacturers are promoting their own products "HD." For television, if the resolution can reach 1080p, it can be regarded as high-definition, but this standard may not be fully applicable to security. High-definition is an inevitable trend of monitoring and development. However, what kind of standards will exist in the future, or what concept of high-definition, which is generally accepted by all, is still not conclusive. Let us wait and see, I believe that in the next three years, we will be able to find the answer.
Monitors show that the four major technologies constitute a large-screen splicing system. Currently, the more common large-screen splicing systems are generally divided into three main types according to the working modes of the display units, namely, LCD display unit splicing, PDP display unit splicing, and DLP rear projection display unit Stitching. Among them, the former two belong to a flat panel display unit splicing system, and the latter belongs to a projection unit splicing system.
Plasma large screen splicing system PDP (PlasmaDisplayPanel), namely plasma display. The PDP is a display technology using a gas discharge, and its working principle is very similar to a fluorescent lamp. It uses a plasma tube as a light-emitting element. Each plasma tube on the screen corresponds to a pixel. The screen uses glass as a substrate, and the substrates are spaced a certain distance to form a discharge space. The discharge space is filled with inert gas such as helium, neon and the like as a working medium. On the inner surfaces of the two glass substrates, a conductive film of a metal oxide is coated as an excitation electrode. When a voltage is applied to the electrode, a plasma discharge phenomenon occurs in the gas mixture in the discharge space, which is also called a plasma effect. The plasma discharge generates ultraviolet rays, and the ultraviolet ray excites a fluorescent screen coated with red, green and blue phosphors, and the fluorescent screen emits visible light to show an image.
PDP unit splicing has the advantages of bright colors, high contrast and high brightness, but also has its own insurmountable disadvantages. Because plasma consumes a lot of power and heat, it can cause serious burns and is not suitable for long-term static screen display monitoring. And after the PDP unit is used for splicing, the temperature of the whole machine is higher, and the device is easily burned. In addition, plasma splicing curtain wall prices are currently higher in the market, and the price of one square meter is generally more than 100,000. Today, low-carbon and energy-saving have become mainstream trends. For most ordinary users, plasma splicing is obviously not its best choice.
Despite its many shortcomings, the bright plasma and high-brightness features make it possible to display images with outstanding advantages, making plasma splicing the darling of some exhibitions. In addition, the government agencies that require higher picture quality are also preferred. However, from the perspective of the overall market share, plasma splicing is at a complete disadvantage, and the development potential of the entire industry is limited by the potential for plasma splicing. According to some industry analysts, the industry is currently a “chicken industry†and it will certainly be replaced in the future.
LCD LCD splicing The so-called LCD LCD splicing is a splicing screen that uses the LCD display unit splicing method to achieve a large-screen display effect through a splicing control software system. LCD LCD splicing is currently represented by South Korea's Samsung DID. Although there are SHARP, LG, NEC and other brands in the splicing market, DID is unique in LCD panel splicing technology with its excellent price/performance ratio.
LCD splicing has the advantages of thin thickness, light weight, low energy consumption, long life, no radiation, etc., and its exquisite picture, high resolution, excellent performance of various key performance indicators, has made it the mainstream of development, the prospect is good. As a spliced ​​display terminal, LCD has the above advantages, but as a splicing display unit, its disadvantages are also fatal: that is, its spelling is taught at present, and it is the largest among the three splicing display units, so many users have to reluctantly give up.
DLP splicing system DLP is an abbreviation of "Digital Lighting Progress". It means digital light processing, which means that this technique involves first digitally processing the image signal and then projecting the light. Specifically, DLP projection technology is the application of a digital micromirror chip (DMD) as the main key component to achieve digital optical processing. The principle is that the light source is homogenized by an Integrator (Integrator), and the light is divided into R, G, and B colors by a color wheel with color primary colors, and then the color is imaged by the lens in the DMD. on. In the method of synchronizing signals, the digital rotating mirror's electric signal is used to convert continuous light to grayscale, and the color is expressed in three colors: R, G, and B. Finally, the image is projected through the lens.
DLP large-screen splicing system is based on DLP projectors and is equipped with a high-brightness, high-resolution color realistic video wall composed of image processors. It can display various computer, network signals and video signals. The screen can be randomly roamed and opened. , zoom in and out. In addition, compared with other splicing techniques, the outstanding advantage of DLP splicing is “zero gapâ€, and the physical gap screen has a good overall display effect. Moreover, the DLP splicing system has a lower requirement for the environment, thereby reducing operating costs.
With the development of continuously improving monitoring technology, HD is one of the main directions for the development of monitoring technology. Combining network technology brings new changes, while constantly satisfying the demands of market competition, it tends to be a kind of rational thinking. We enter our world with a high profile and high demand. In the ever-evolving surveillance technology field, high-definition surveillance will also be a bright star, and its light is re-examining the world around us.
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