High-definition network video surveillance technology resolve

High-definition network video surveillance technology resolve
Some customers often complain: a large-scale monitoring system but when even a face is not clear; said: happens to the important process of the event, but not see the camera.
How to transfer to ensure the quality of the video image, become important issues facing video surveillance system. Traditional analog surveillance cameras due to the limitations of NTSC / PAL system, a maximum resolution of 4CIF (about 40 million pixels), is often difficult to ensure adequate image detail, limited or even lack of video analysis capabilities it is difficult to monitor staff provide a clear enough image detail. To ensure clarity of the video image detail, the control range of the camera will be limited, which often implies the need to add more cameras in order to ensure effective coverage of the monitored. How to do a combination of both ways of image detail and monitoring coverage is a major challenge encountered by the traditional analog control system.
Network video surveillance has higher image high resolution, convenient installation and deployment, support PoE, save cable, easy remote monitoring access, embedded intelligence analysis capabilities, flexibility and scalability and openness traditional analog control system do not have the advantage. Among them, the network video surveillance can get HD high-resolution images, which will undoubtedly provide more detail of the image, to more clearly identify faces, objects, to obtain a more comprehensive video information, this becomes a video surveillance network a major development trends and advantages.
Throughout the course of development of industrial technology, such as telephones, televisions, computers and technology and promoting the main driving force of the pre-existence of the needs and development of the consumer goods market.
At present, the TV market is rapidly development of high-definition television (HDTV), this change significantly improves the image quality and color fidelity. Compared with the traditional analog TV, HDTV resolution up to five times that of the former, the linear resolution up to twice as much. In addition, HDTV widescreen format and DVD quality audio.
HD megapixels difference
As customers have demanded higher image quality standards, the development in the past began to affect the video surveillance market. Clearer, more realistic image is the surveillance industry long-term quest, especially in those with moving objects or precise identification of critical industrial applications.
It is noteworthy that, in the field of video surveillance, especially in the field of network video surveillance, a frequently heard term called "megapixels", megapixels HD IP Camera to meet some of the requirements. However, the "megapixels" concept is not a recognized standard, the only industry to adopt a best practice, it specifically refers to the number of image sensor elements of digital cameras. Due to the high resolution is often accompanied by a large amount of image data, which often affects the frame rate. Megapixels HD IP Camera is usually emphasized that the resolution of the image, in the image frame rate often amounted to less than real-time requirements (25/30fps). So, just emphasize megapixels, even HD megapixels equate, is a common misunderstanding of the surveillance industry.
In contrast, to meet any given HDTV standard IP Camera will be able to provide some kind of resolution, frame rate and color fidelity, to always make sure that the video quality.
The HDTV standard defines not only the resolution requirements (720p, 1080i / P), and also defines the requirements of the full frame rate (25/30fps), and color fidelity requirements. And, HDTV also defines the widescreen 16:9 format.
HD standardization and formats
The introduction of the MPEG-1 compression standard for digital TV laid the foundation, and to stimulate the development of modern TV standards worldwide.
Today, the most important HDTV standards bodies, Film and Television Engineers (SMPTE). The organization is a film, television, video and multimedia standards development and the authoritative practice areas recognized as a global leader, the two most important criteria have been defined: SMPTE 296M and SMPTE 274M.
Fundamentally speaking, SMPTE 296M defines a 1280x720 pixel resolution with progressive scan, and SMPTE 274M defines a 1920x1080 pixel resolution in interlaced or progressive scan.
With such as MPEG-2 and H.264 compression method, a sufficient bandwidth to transmit analog TV channels and up to five conventional digital TV channels, or use progressive scan HDTV channels.
HDTV usually 16:9 widescreen aspect ratio and 1920 pixels horizontal resolution with progressive scan. Therefore, this realization the frame resolution of 2,073,600 (1920x1080) pixels. The frame rate can be varied, and specified after the letter p, for example: 1080p30 or 1080p50.
Other HDTV formats 1080i and 720p. The screen aspect ratio is the same for all three formats, 16:9. 1080i interlaced display 1920x1080 lines, 720p progressive scan display 1280x720 (921,600) pixels.
HD technology in the field of video surveillance
There is no doubt that the introduction of high-definition (HDTV) video surveillance into a new phase has a very important milestone.
Progressive scan, IP Camera with HDTV performance to achieve true color representation and clear images, even if the subjects are moving fast. This makes the the HDTV need more image detail monitoring sites of the most attractive solutions.
The development of quality people have been struggling to pursue the goal can be achieved, however, only until the video compression technology developed to a certain level. The H.264 standard is a require a license to use open standards, can reduce the size of the digital audio file, without compromising image quality. Compared with the Motion JPEG format, the digital audio file size can be reduced by 80%, compared with MPEG-4 Part 2, can be reduced by 50%. Due to its flexibility and economy of bandwidth and storage than the previous compression standard, H.264 is expected to adopt a wider range. H.264 is a prerequisite for the introduction of HDTV in video surveillance. At the same time, the effective compression to achieve high resolution, high frame rate and 16:9 aspect ratio.
In the past, high-resolution, high-quality images need to consume more camera image processing chip resources, therefore, subject to the limited processing power of the camera chip, a relatively simple algorithm M-JPEG compression algorithm for high-resolution IP Camera, very high video occupied bandwidth, even up to 20Mbps to 30Mbps; With the rapid development of chip technology, to achieve a highly efficient H.264 compression technology with HDTV high-definition video combined with completely required for high-definition video bandwidth control completely within the acceptable range, which also makes high-definition monitor greatly enhance the usability.
The user can select from different angles in the benefits of high-definition video surveillance. First of all, the 16:9 widescreen format makes video surveillance greatly improve the effective coverage, if the 4:3 aspect ratio of conventional cameras installed in the ceiling of walkways or entrances, nearly 1/3 of the monitored area facing the ceiling so Invalid monitoring area, the really covered walkway or door area only the remaining 2/3; 16:9 widescreen format camera, on the contrary, to effectively improve the coverage of the camera in the transverse direction, camera monitoring area.
Alternatively, you can utilize the rotation of the camera image, such as road monitoring effective monitoring range.
From the point of view of the pixel HD IP Camera also greatly enhance the video image clarity and coverage of pixels per unit area. The human face recognition, for example, from the point of view of the pixels, a relatively clear face on the level to be occupied by about 60-80 pixels, and the choice of HD IP Camera can be used 2-3 times more pixels describe a same object, which undoubtedly greatly improve the sharpness of the image and provide more details for object recognition, face and even event procedure has a great help.
On the other hand, HD IP Camera without loss of image clarity conditions can expand the coverage of the video image. For example, a 1080p network camera can cover the equivalent of four ordinary camera monitoring area covered. From this perspective, the use of high-definition surveillance technology can also help ensure image quality under the premise of reducing the number of cameras and thus greatly reduce the cost of monitoring.
Conclusion
To measure the performance of video surveillance systems is an important standard is the image quality or sharpness of the image. The future, the development of video surveillance will undoubtedly toward higher resolution the clearer image effect direction, chip technology, compression technology will promote the further innovation of high-definition technology.
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