In recent years, with the continuous improvement of people's security video surveillance requirements, the security monitoring industry has developed rapidly. The application of video surveillance has grown from individual industries to the needs of the mass market, from local monitoring to remote monitoring across regions and across provinces, from analog video surveillance to IP video surveillance with multiple advantages. With the constant pursuit of image clarity, high-definition surveillance has gradually become the industry's development trend.
The advantages of high-definition video surveillance
High-definition video cameras are borrowed from the concept of broadcast television. The application of television has always used resolution to evaluate the capabilities of image expression. High resolution is a goal that has been pursued by the application of television cameras. Under the condition of keeping the scanning format unchanged, the horizontal resolution has been continuously improved. For example, the so-called analog HD video camera has a resolution of 600-700 TVL. Some video cameras have up to 1,300,000, or even 5 million pixels, and their output signals are standard-definition video signals. When the electronic zoom (shooting or displaying part of the image) can get high resolution, but They are still standard television format equipment and are fully interchangeable. Some large-pixel cameras, because they can't guarantee enough frame rates, are already in the category of digital cameras.
HDTV cameras, on the other hand, require that the image resolution be doubled in the horizontal and vertical directions than the average standard television, and that light and color separation (standard definition is compounded by spectral interlacing techniques), so the (TV) scan format, The baseband signal format is different from standard definition television. The two are no longer compatible and are not interchangeable. The current image output of high-definition cameras is mainly digital streams.
To promote a high-definition surveillance system, we must first clarify in what aspects high-definition images can show its advantages. Obviously, the value of high-definition images can only be reflected when observing partial images and wishing to obtain details of the images. If the partial image is displayed in a full screen, the image still has a very high resolution, and no mosaic phenomenon occurs. When the electronic or road bayonet system performs number plate recognition, a sufficient number of pixels can obtain a high recognition rate. As another example, when image recognition is performed, a high resolution (pixel) image is an important condition. However, in the normal real-time monitoring environment (viewing distance and displaying dynamic images), the observation results of high-definition images and standard-definition images have little difference; in the analysis of image behavior, the stability of the frame rate of the image (time resolution capability) is very high. High, but the image (space) resolution requirements are not high. Therefore, when building a video surveillance system, it is necessary to analyze specific problems and adapt them to local conditions. Select the appropriate location and location to use HD cameras. Do not simply start from the concept.
At present, high-definition video surveillance systems have not yet formed a unified standard (standard), how to implement the camera system, transmission, video, display, image conversion and processing equipment complete supporting and unified interface. This is also the problem that HD video surveillance technology must solve as soon as possible. Only by establishing a unified standard and forming a complete package can we achieve the interchangeability and versatility of all manufacturers' equipment and provide users with more choices.
The most important thing is to solve the problem of integration of high-definition images with standard image systems. They cannot simply be two separate systems to ensure high-quality images and high resolution for HD systems. The video surveillance system must comprehensively display, record, and edit the images of various signal sources in the system to downconvert high-definition images or upconvert standard images. Currently, it is rare to see a system that upconverts SD signals. Most systems decode high-definition image signals into standard-definition format (down-converted) when displaying images. Obviously, such systems compromise the image quality of high-definition cameras.
HD video surveillance applications
With regard to the current needs of key industries, there is a strong demand for high-definition in fields such as road traffic, urban security monitoring, airports, subways, financial banks, customs, and border security that require strict security protection. Applications in other fields are also expanding, such as water power, telemedicine video teaching, and environmental testing. The following analysis of typical industry applications:
Road monitoring
In the road monitoring, how to clearly see the speeding license of the vehicle on the highway? At the crossroads, how to effectively capture the license plate of the vehicle driving illegally? At the automatic toll gates such as road and bridge, how to obtain the license plate information of the passing vehicle? How to obtain high-definition pictures in the traffic system to help intelligent analysis software to achieve intelligent monitoring applications? High-definition video surveillance can well solve the many needs of road monitoring.
The front-end high-definition camera can capture high-definition pictures, and through the combination with intelligent transportation, greatly improve the accuracy of image detail analysis, so that intelligent monitoring can play a more practical role.
*surveillance system
It is understood that in the * system applications, the vast majority of analog camera equipment can not meet the needs of the investigation and evidence collection. The video image transmitted by the traditional analog camera is obscure, and during the night, the illegal behavior takes a long time, and the video image cannot recognize the face clearly. Whenever there are many characters on the screen or the movement is fast, the image will be worse. The application of high-definition cameras can improve the clarity of video surveillance and bring the best image effects to the system. HD rich picture details, wide coverage and other characteristics, can be well applied in the public places of the flow of people, traffic density, for suspicious personnel, can also be seen clearly after zooming in people's facial features. Through the combination with video intelligent analysis technology, high-definition video screen resolution is provided for intelligent monitoring, which effectively improves the reliability of intelligent early warning.
Financial Bank
The financial industry was one of the first industries to use video surveillance equipment. Since 2000, the financial industry's monitoring system has upgraded from analog to digital, but its clarity hasn't improved. As a high-risk industry, its criminal activities are characterized by rapidity, suddenness, and concealment. How to quickly and accurately capture the details of the site at key locations and critical times becomes an important issue for the bank security department. High-definition video is the most direct solution. High-definition video images are provided in high-definition. The face features of suspicious persons are clearly distinguishable. Combined with intelligent analysis technology, they can be discovered for the first time and can be automatically tracked to promptly stop the occurrence of crimes.
SCHOOL
After several major campus vicious revenge incidents from April to May 2010, the construction of campus security was highly valued by the relevant national authorities. After the campus security upgrade, there are certain demands for the application of high-definition products, but it is not a system-wide application. It is mainly for point requirements. For example, high-density cameras need to be installed at school gates, perimeter fences, playgrounds, etc. where students are dense and mobile. The students in the guardianship school are safe, suspicious persons are found, and the school security personnel are automatically followed up and alerted.
Airports, ports and other public places
Airports, ports and other places have features such as large population flow and complicated personnel, and are often visited by criminals. How can you quickly and accurately find a target in a crowded crowd? How to detect suspicious individuals in a timely manner and stop crimes from happening at the first time? Get high-definition video cameras in surveillance areas such as entrances and exits, ticket halls, and waiting halls to capture clear images and achieve high definition Storage is very important when you need to obtain important high-quality video evidence in the event of a dispute.
The advantages of high-definition video surveillance
High-definition video cameras are borrowed from the concept of broadcast television. The application of television has always used resolution to evaluate the capabilities of image expression. High resolution is a goal that has been pursued by the application of television cameras. Under the condition of keeping the scanning format unchanged, the horizontal resolution has been continuously improved. For example, the so-called analog HD video camera has a resolution of 600-700 TVL. Some video cameras have up to 1,300,000, or even 5 million pixels, and their output signals are standard-definition video signals. When the electronic zoom (shooting or displaying part of the image) can get high resolution, but They are still standard television format equipment and are fully interchangeable. Some large-pixel cameras, because they can't guarantee enough frame rates, are already in the category of digital cameras.
HDTV cameras, on the other hand, require that the image resolution be doubled in the horizontal and vertical directions than the average standard television, and that light and color separation (standard definition is compounded by spectral interlacing techniques), so the (TV) scan format, The baseband signal format is different from standard definition television. The two are no longer compatible and are not interchangeable. The current image output of high-definition cameras is mainly digital streams.
To promote a high-definition surveillance system, we must first clarify in what aspects high-definition images can show its advantages. Obviously, the value of high-definition images can only be reflected when observing partial images and wishing to obtain details of the images. If the partial image is displayed in a full screen, the image still has a very high resolution, and no mosaic phenomenon occurs. When the electronic or road bayonet system performs number plate recognition, a sufficient number of pixels can obtain a high recognition rate. As another example, when image recognition is performed, a high resolution (pixel) image is an important condition. However, in the normal real-time monitoring environment (viewing distance and displaying dynamic images), the observation results of high-definition images and standard-definition images have little difference; in the analysis of image behavior, the stability of the frame rate of the image (time resolution capability) is very high. High, but the image (space) resolution requirements are not high. Therefore, when building a video surveillance system, it is necessary to analyze specific problems and adapt them to local conditions. Select the appropriate location and location to use HD cameras. Do not simply start from the concept.
At present, high-definition video surveillance systems have not yet formed a unified standard (standard), how to implement the camera system, transmission, video, display, image conversion and processing equipment complete supporting and unified interface. This is also the problem that HD video surveillance technology must solve as soon as possible. Only by establishing a unified standard and forming a complete package can we achieve the interchangeability and versatility of all manufacturers' equipment and provide users with more choices.
The most important thing is to solve the problem of integration of high-definition images with standard image systems. They cannot simply be two separate systems to ensure high-quality images and high resolution for HD systems. The video surveillance system must comprehensively display, record, and edit the images of various signal sources in the system to downconvert high-definition images or upconvert standard images. Currently, it is rare to see a system that upconverts SD signals. Most systems decode high-definition image signals into standard-definition format (down-converted) when displaying images. Obviously, such systems compromise the image quality of high-definition cameras.
HD video surveillance applications
With regard to the current needs of key industries, there is a strong demand for high-definition in fields such as road traffic, urban security monitoring, airports, subways, financial banks, customs, and border security that require strict security protection. Applications in other fields are also expanding, such as water power, telemedicine video teaching, and environmental testing. The following analysis of typical industry applications:
Road monitoring
In the road monitoring, how to clearly see the speeding license of the vehicle on the highway? At the crossroads, how to effectively capture the license plate of the vehicle driving illegally? At the automatic toll gates such as road and bridge, how to obtain the license plate information of the passing vehicle? How to obtain high-definition pictures in the traffic system to help intelligent analysis software to achieve intelligent monitoring applications? High-definition video surveillance can well solve the many needs of road monitoring.
The front-end high-definition camera can capture high-definition pictures, and through the combination with intelligent transportation, greatly improve the accuracy of image detail analysis, so that intelligent monitoring can play a more practical role.
*surveillance system
It is understood that in the * system applications, the vast majority of analog camera equipment can not meet the needs of the investigation and evidence collection. The video image transmitted by the traditional analog camera is obscure, and during the night, the illegal behavior takes a long time, and the video image cannot recognize the face clearly. Whenever there are many characters on the screen or the movement is fast, the image will be worse. The application of high-definition cameras can improve the clarity of video surveillance and bring the best image effects to the system. HD rich picture details, wide coverage and other characteristics, can be well applied in the public places of the flow of people, traffic density, for suspicious personnel, can also be seen clearly after zooming in people's facial features. Through the combination with video intelligent analysis technology, high-definition video screen resolution is provided for intelligent monitoring, which effectively improves the reliability of intelligent early warning.
Financial Bank
The financial industry was one of the first industries to use video surveillance equipment. Since 2000, the financial industry's monitoring system has upgraded from analog to digital, but its clarity hasn't improved. As a high-risk industry, its criminal activities are characterized by rapidity, suddenness, and concealment. How to quickly and accurately capture the details of the site at key locations and critical times becomes an important issue for the bank security department. High-definition video is the most direct solution. High-definition video images are provided in high-definition. The face features of suspicious persons are clearly distinguishable. Combined with intelligent analysis technology, they can be discovered for the first time and can be automatically tracked to promptly stop the occurrence of crimes.
SCHOOL
After several major campus vicious revenge incidents from April to May 2010, the construction of campus security was highly valued by the relevant national authorities. After the campus security upgrade, there are certain demands for the application of high-definition products, but it is not a system-wide application. It is mainly for point requirements. For example, high-density cameras need to be installed at school gates, perimeter fences, playgrounds, etc. where students are dense and mobile. The students in the guardianship school are safe, suspicious persons are found, and the school security personnel are automatically followed up and alerted.
Airports, ports and other public places
Airports, ports and other places have features such as large population flow and complicated personnel, and are often visited by criminals. How can you quickly and accurately find a target in a crowded crowd? How to detect suspicious individuals in a timely manner and stop crimes from happening at the first time? Get high-definition video cameras in surveillance areas such as entrances and exits, ticket halls, and waiting halls to capture clear images and achieve high definition Storage is very important when you need to obtain important high-quality video evidence in the event of a dispute.
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