Tag: HD-CCTV SDI
This article refers to the address: http://
Video surveillance technology is in the transition period, and new technologies and new products are emerging, providing us with more choices. But the transformation is not simply a new and old replacement, but a process of gradually combining, integrating and transforming the two. Traditional systems have certain advantages in many occasions, and the application of new technologies and new products is also limited by resources and environment. The technical ability and maturity still need time to test. Therefore, in the face of numerous technologies, we must make reasonable choices.
To realize the advantages of the essence of new technologies, the application of new technologies cannot be based on concepts. It is necessary to correctly understand their essential advantages and display them through appropriate technical routes. This is the real purpose of applying new technologies.
The essential advantage of digitization is that it can obtain and express more abundant information, and can greatly reduce system overhead (resource occupation). Digital video surveillance systems must achieve high image quality (compared to analog systems) in order to be truly recognized and accepted by the market. In the process of digitizing the video system, there is a problem of how long the last video cable is, and where the analog-to-digital conversion is performed, that is, how to ensure that the system can obtain better image quality.
To promote high-definition surveillance systems, we must first define where HD images can show its advantages. Obviously, the value of high-definition images can be reflected when observing partial images and hoping to obtain image detail information. When the partial image is displayed in full screen, the image still has a high resolution; when the electronic police or road bayonet system performs the number plate recognition, a sufficient number of pixels can obtain a higher recognition rate; when the image is recognized, the high resolution (pixel) ) Images are an important condition. However, in the normal real-time monitoring environment, the observation effect of HD image and SD image is not much different; when performing image behavior analysis, the frame rate stability (time resolution capability) of the image is very high, and the image (space) is distinguished. The rate requirement is not high; when separating and analyzing the target, the information is mainly based on the contour, color and other information of the target, and does not pay attention to the image details.
High definition is borrowed from the concept of broadcast television, and has many understandings in the security industry, such as analog HD, large pixels, full HD and so on. Some are still standard-definition television systems; some (TV) scanning systems and baseband signal formats are different from standard-definition televisions, and are no longer compatible and are not interchangeable. At present, the high-definition video surveillance system has not yet formed a unified standard (standard), which realizes a complete supporting and unified interface for imaging, transmission, recording, display, image transformation and processing equipment in the system. This is also the problem that HD video surveillance technology should solve as soon as possible. The most urgent task is to solve the integration problem between HD and SD systems.
The technology road to realize high-definition video surveillance system has two schemes of HD-CCTV and network video. From the propaganda of the media, the voice of online video seems to be very high. Recently, the sound of HD-CCTV has gradually increased. In fact, in terms of technology maturity and image quality, the latter has advantages, but only limited by transmission bandwidth. There are certain limits in the scope of application. At present, network video is mainly used in the networking of video surveillance systems. The focus is also on solving interconnections between networks, inter-system interoperability and inter-data interworking (decoding), etc., and does not propose better implementation of high-definition image transmission. Program.
HD-CCTV is developed from the SDI mode of the broadcasting and television system. From the perspective of system structure: it is an extension of the traditional monitoring mode. The core features are the closed circuit structure and the specificity of the transmission medium. The video stream output by the camera is not packetized or compressed, so the transmitted image is not distorted, not jittered, and has good real-time performance, and provides the best image for intelligent analysis of the image in the background of the system. Such a structure facilitates the conversion of the system from SD to HD, from analog to digital smoothing. However, smooth conversion does not mean complete compatibility. The so-called "plug and use" is wrong. It is considered to be exactly the same as analog video. It is also wrong. The coaxial cable or BNC connector used in the system is completely different in performance from the products in the analog CCTV system.
The data stream of the SDI system is not a normal video compression coded signal, but a digital stream that converts parallel video component signals into serial sequential signals. Since it is not compressed, the data rate is high. Typically, SDI is a 270M system and HD-SDI is a 1.5G system. Therefore, the transmission distance is greatly limited, but with the advancement and application of optical communication technology, this will be significantly improved, and the application range of the HD-CCTV method will continue to expand.
Network video, using the digital video system of the network platform. Its characteristics are open, the system can be generated autonomously, and it is easy to expand and upgrade the system. At present, there are a large number of applications for video surveillance systems based on network transmission, but compared with analog video surveillance systems, there is no advantage in image quality.
Correctly understand the applicability and limits of new technologies, and do not blindly pursue new technologies and generate excessive expectations. For example, look forward to high-definition cameras and intelligent analysis techniques to solve invisible and invisible problems. However, it is not entirely because there is no camera. It is not usually because the resolution of the camera is not enough. When it is invisible or invisible, intelligent analysis cannot be performed. Intelligent processing cannot generate unrecognized information and recover lost. information. At present, many new technologies have high requirements on resources and environmental conditions. Therefore, applications are limited. At the same time, there are still gaps between the achievable effects and expectations. Be sure to have a full understanding of this.
Xiaoyuzhongyangcongye Ceshi®
I am excited about the opportunity to work with [Company/Organization Name] and contribute my skills and knowledge to the team. Thank you for considering my application.
ceshi
2222Bossgoo(China)Tecgnology.(Bossgoo(China)Tecgnology) , https://www.cn-gangdao.com