Advantages and applications of HD video surveillance

In recent years, with the continuous improvement of people's demand for security video surveillance, the security monitoring industry has developed rapidly. The application of video surveillance has evolved from individual industries to the needs of the mass market, from local monitoring to remote monitoring across regions and provinces, from analog video surveillance to IP video surveillance with multiple advantages. With the constant pursuit of image clarity, HD surveillance has gradually become the development trend of the industry.

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The advantages of HD video surveillance

High-definition cameras borrow the concept of broadcast television, which has the ability to use television to evaluate the details of images. High resolution is the goal that TV cameras have been pursuing. The horizontal resolution is constantly improved while keeping the scanning format unchanged. For example, the so-called analog HD camera has a resolution of 600-700 TVL. Some cameras have imaging devices with a pixel count of 1.3 million, 5 million, or even higher. Their output signals are standard-definition video signals, and high resolution is achieved when electronic zooming (shooting or displaying partial images), but They are still standard TV equipment and are fully interchangeable. There are also some large-pixel cameras that are already in the category of digital cameras because they cannot guarantee a sufficient frame rate.

HDTV cameras are different. They require image resolution to be doubled in the horizontal and vertical directions compared to the average standard TV, and the color and color separation (standard definition is combined by spectrum interleaving technology), so (TV) scanning system, The baseband signal format is different from standard definition TV, and the two are no longer compatible and are not interchangeable. At present, the image output of a high-definition camera is mainly a digital stream.

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. If the partial image is displayed in full screen, the image still has a high resolution and no mosaic phenomenon; when the electronic police or road bayonet system performs the number plate recognition, a sufficient number of pixels can obtain a higher recognition rate. A high-resolution (pixel) image is an important condition when performing image individual recognition. However, in the normal real-time monitoring environment (viewing distance and displaying dynamic images), the observation effect of HD images and SD images is not much different; when performing image behavior analysis, the frame rate stability (time resolution capability) of images is very demanding. High, but the image (space) resolution requirements are not high. Therefore, when constructing a video surveillance system, it is necessary to analyze the specific problems and adapt to the local conditions. Select the appropriate occasions and parts to adopt high-definition cameras. Do not simply proceed from the concept and make a one-size-fits-all approach.

At present, the high-definition video surveillance system has not yet formed a unified standard (standard), how to realize the complete supporting and unified interface of the camera, 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. Only by establishing a unified standard and forming a complete package can we achieve the interchangeability and versatility of the equipment of each manufacturer, providing users with more choices.

The most important thing is to solve the integration problem between HD images and standard image systems. They cannot simply be two separate systems to ensure high quality images and high resolution in HD systems. The video surveillance system must perform comprehensive display, recording, and editing of images of various signal sources in the system, down-converting high-definition images, or up-converting standard images. At present, it is rare to see a system that up-converts SD signals. Most systems decode HD image signals into SD format (down-conversion) during image display. Obviously, such a system discounts the image quality of HD cameras.

HD video surveillance application

As far as the current demand of key industries is concerned, there is a strong demand for high definition in areas such as road traffic, urban security monitoring, airports, subways, financial banks, customs, border security and other areas that require strict security protection. Applications in other fields are also expanding, such as water conservancy and electric power, telemedicine video teaching, and environmental testing. The following is an analysis of typical industry applications:

Road monitoring

In the road monitoring, how to see the license plate of the speeding vehicle on the expressway? At the intersection, how to effectively capture the license plate of the illegal driving vehicle? How to obtain the license plate information of the incoming vehicle in the automatic toll gate such as road and bridge? How to obtain high-definition images in the transportation system to help intelligent analysis software realize intelligent monitoring applications? HD video surveillance can well solve many needs in road monitoring.

The high-definition camera on the front end can acquire high-definition images, and by combining with intelligent transportation, the accuracy of image detail analysis is greatly improved, so that intelligent monitoring can play a more practical role.

Public security monitoring system

It is understood that in the application of the public security system, most of the analog camera equipment can not meet the needs of public security investigation and evidence collection. The video image transmitted by the traditional analog camera is unclear, and the video image cannot recognize the face at a high time during the nighttime illegal behavior. The image is even worse when there are more people on the screen or when the action is faster. The application of high-definition cameras can improve the clarity of video surveillance and bring the best image effects to the public security system. High-definition rich picture details, wide coverage, etc., can be well applied in public places of people flow and traffic density. For suspicious people, you can also see the facial details of people after zooming in. By combining with video intelligent analysis technology, it provides high-definition video screen resolution for intelligent monitoring, which effectively improves the reliability of intelligent early warning.

Financial bank

The financial industry was one of the first to use video surveillance equipment. Since 2000, the financial industry's surveillance system has been upgraded from analog to digital, but the clarity has not been upgraded. As a high-risk industry, its criminal activities are characterized by rapid, sudden and hidden. How to quickly and accurately capture the details of the site at key locations and critical time periods has become an important issue for the bank's security department. And high-definition video is the most direct solution. HD provides high-resolution video images, which clearly distinguishes the features of suspicious people. Combined with intelligent analysis technology, it can be found in the first time and automatically tracked to prevent criminal behavior from happening in time.

SCHOOL

After several major campus vicious retaliation incidents from April to May 2010, the campus's security construction was highly valued by relevant state departments. After the campus security upgrade, there are certain requirements for the application of high-definition products, but it is not a full-system application, mainly for point requirements, such as high-definition cameras in schools where students are dense and mobile, such as school gates, perimeter walls, playgrounds, etc. The guardian school students are safe, find suspicious persons, automatically track and notify the school security personnel.

Public places such as airports and ports

Airports, ports and other places have the characteristics of large population movements and complex personnel, and are places where criminals often appear. In a crowd of people, how can we quickly and accurately find the target? How to find suspicious people in time, and stop the criminal behavior in the first time? By deploying high-definition cameras in the surveillance areas such as entrances and exits, ticket halls, waiting halls, etc. Storage is very important when it comes to obtaining high quality video evidence in the event of a dispute.

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