The IP network camera is a digital device based on network transmission. In addition to the common composite video signal output interface BNC (the general analog output is used for debugging and cannot represent its own effect), the network camera has a network output interface and can directly Access the local area network.
How the IP Camera Works Analysis of the IP Camera The typical IP network camera that supports the IP protocol includes a lens, a filter, an embedded image sensor, an image-to-digital converter, an image compressor, and a network connection only. Functional server. Each IP network camera has its own IP address, data processing capabilities, and built-in application software. It can be used as a web server, FTP server, FTP client, and email client. Many advanced IP network cameras also include special features. Such as mobile detection, alarm signal output / input device and mail support functions.
IP network cameras not only support all standard analog CCTV camera functions, but also provide users with more system functions and can reduce more costs. Because IP network cameras can be plugged directly into existing data networks and applied via Ethernet, companies can save thousands of dollars in wiring costs. At the same time, IP network cameras can work independently on PCs, and images can be read using standard web browsers. take.
In addition IP network cameras also save a lot of specific monitoring equipment and systems for the company, because the system can use the IP machine to monitor and control in real time through the network in any corner of the world. The analog CCTV system requires special monitoring equipment and security personnel who are responsible for monitoring images. The new high-tech surveillance IP network camera can transmit video signals of 30 frames per second in real time through a standard web browser via a coaxial CCTV system and a computer network. Leading technology developers have included tracking down and detecting pre and post-alert messages, sending short messages via e-mail and SMS, and the centralized use of wireless and wireline technologies will facilitate the delivery of clearer images.
<br> <br> image compression image compression IP camera use more MotionJPEG manner based on the requirements of IP technology, the need for more security monitoring applications, high-quality transmission in local area network or other media images is subject to bandwidth limitations, MotionJPEG compression mode compared to H. 26l, H. 263, MPEG, Wavelet and other compression formats are more popular with most manufacturers. The quality of the generated image is continuous and the format is more suitable. The MotionJPEG format fully supports the web browser standard, so that data images can be transmitted and displayed in real time from any network platform without additional user-designed software.
IP network cameras use the compression method can be roughly divided into H.264, M-JPEG, MPEG1, MPEG2, MPEG4 and Wavelet several. Among them, H.264 and MPEG4 are currently the mainstream compression methods. From a functional point of view, IP network cameras are classified into audioless and audio. Based on the consideration of the IP network camera price point and the transformation of the traditional analog monitoring system, another similar solution for remote monitoring is to replace the function of an IP network camera with an ordinary camera and a network camera server (webserver). Known as a video gateway or video server, the built-in Web server is a dedicated network video and audio access device with an embedded operating system. It provides a solution for real-time video surveillance through a standard browser.
MPEG4 compression method and its module IP network camera M-CAM, its main principle is built-in an embedded Webserver. Users on the network can use the browser (such as Microsoft IE or Netscape) to view the camera images on the Web server. The authorized users can also control the actions of the camera pan-tilt lens or operate the system configuration. At the same time also has the alarm input and output functions.
Then, we can roughly judge the quality of the IP camera by the following five points.
1. Sharpness test You can easily determine the sharpness of a high-definition camera by using an ordinary video image sharpness (line number) test card. This method can directly distinguish the sharpness of an image by the naked eye. In general, HDTV 720P camera test card indicators can clearly distinguish TV lines larger than 800TVL, while poor HD cameras have a lower index, and images There is jitter or flash.
2. Dynamic Range Test The gray level data of high-definition images can be easily determined by ordinary video image gray scale test cards.
3, color reproduction through the color test card or the naked eye to determine the degree of color reproduction of high-definition video images. Generally, a good HD IP camera has a very high degree of reduction, and it can achieve a very realistic reduction effect.
4. The suppression of noise in the case of the same signal to noise ratio is one of the important indicators to measure the performance of HD IP cameras. The bright processing and noise suppression on the screen directly determine the image quality effect. Many low-end cameras can only output more clear images in an ideal state of 100 Lux or more, and adapt to changes in light environment. Poor, strong or low-light environments have no effective means of suppressing noise and cannot guarantee image quality. In this case, the HD image is meaningless. We call it pseudo-HD.
5, image encoding compression algorithm IP high-definition camera for image encoding compression algorithm good and bad is also an important indicator of the direct impact on the performance of the camera, the current market on the HD video camera image encoding compression processing chip is divided into DSP chips and Two kinds of carriers of ASIC chip, each has its own merits, the application of DSP chip function is relatively flexible, the development cycle is short, but the coding efficiency is low, and the cost is high. The application of ASIC chips is relatively fixed and the development cycle is long, but the coding efficiency is high, and the cost is low after mass use. No matter what kind of carrier is needed, a good video encoding compression algorithm is needed. A good algorithm can reduce the video stream and storage capacity as much as possible while ensuring the image quality and clarity. Poor IP high-definition cameras often produce mosaics or water ripples under large amounts of activity, which directly affects video image quality.
How the IP Camera Works Analysis of the IP Camera The typical IP network camera that supports the IP protocol includes a lens, a filter, an embedded image sensor, an image-to-digital converter, an image compressor, and a network connection only. Functional server. Each IP network camera has its own IP address, data processing capabilities, and built-in application software. It can be used as a web server, FTP server, FTP client, and email client. Many advanced IP network cameras also include special features. Such as mobile detection, alarm signal output / input device and mail support functions.
IP network cameras not only support all standard analog CCTV camera functions, but also provide users with more system functions and can reduce more costs. Because IP network cameras can be plugged directly into existing data networks and applied via Ethernet, companies can save thousands of dollars in wiring costs. At the same time, IP network cameras can work independently on PCs, and images can be read using standard web browsers. take.
In addition IP network cameras also save a lot of specific monitoring equipment and systems for the company, because the system can use the IP machine to monitor and control in real time through the network in any corner of the world. The analog CCTV system requires special monitoring equipment and security personnel who are responsible for monitoring images. The new high-tech surveillance IP network camera can transmit video signals of 30 frames per second in real time through a standard web browser via a coaxial CCTV system and a computer network. Leading technology developers have included tracking down and detecting pre and post-alert messages, sending short messages via e-mail and SMS, and the centralized use of wireless and wireline technologies will facilitate the delivery of clearer images.
<br> <br> image compression image compression IP camera use more MotionJPEG manner based on the requirements of IP technology, the need for more security monitoring applications, high-quality transmission in local area network or other media images is subject to bandwidth limitations, MotionJPEG compression mode compared to H. 26l, H. 263, MPEG, Wavelet and other compression formats are more popular with most manufacturers. The quality of the generated image is continuous and the format is more suitable. The MotionJPEG format fully supports the web browser standard, so that data images can be transmitted and displayed in real time from any network platform without additional user-designed software.
IP network cameras use the compression method can be roughly divided into H.264, M-JPEG, MPEG1, MPEG2, MPEG4 and Wavelet several. Among them, H.264 and MPEG4 are currently the mainstream compression methods. From a functional point of view, IP network cameras are classified into audioless and audio. Based on the consideration of the IP network camera price point and the transformation of the traditional analog monitoring system, another similar solution for remote monitoring is to replace the function of an IP network camera with an ordinary camera and a network camera server (webserver). Known as a video gateway or video server, the built-in Web server is a dedicated network video and audio access device with an embedded operating system. It provides a solution for real-time video surveillance through a standard browser.
MPEG4 compression method and its module IP network camera M-CAM, its main principle is built-in an embedded Webserver. Users on the network can use the browser (such as Microsoft IE or Netscape) to view the camera images on the Web server. The authorized users can also control the actions of the camera pan-tilt lens or operate the system configuration. At the same time also has the alarm input and output functions.
Then, we can roughly judge the quality of the IP camera by the following five points.
1. Sharpness test You can easily determine the sharpness of a high-definition camera by using an ordinary video image sharpness (line number) test card. This method can directly distinguish the sharpness of an image by the naked eye. In general, HDTV 720P camera test card indicators can clearly distinguish TV lines larger than 800TVL, while poor HD cameras have a lower index, and images There is jitter or flash.
2. Dynamic Range Test The gray level data of high-definition images can be easily determined by ordinary video image gray scale test cards.
3, color reproduction through the color test card or the naked eye to determine the degree of color reproduction of high-definition video images. Generally, a good HD IP camera has a very high degree of reduction, and it can achieve a very realistic reduction effect.
4. The suppression of noise in the case of the same signal to noise ratio is one of the important indicators to measure the performance of HD IP cameras. The bright processing and noise suppression on the screen directly determine the image quality effect. Many low-end cameras can only output more clear images in an ideal state of 100 Lux or more, and adapt to changes in light environment. Poor, strong or low-light environments have no effective means of suppressing noise and cannot guarantee image quality. In this case, the HD image is meaningless. We call it pseudo-HD.
5, image encoding compression algorithm IP high-definition camera for image encoding compression algorithm good and bad is also an important indicator of the direct impact on the performance of the camera, the current market on the HD video camera image encoding compression processing chip is divided into DSP chips and Two kinds of carriers of ASIC chip, each has its own merits, the application of DSP chip function is relatively flexible, the development cycle is short, but the coding efficiency is low, and the cost is high. The application of ASIC chips is relatively fixed and the development cycle is long, but the coding efficiency is high, and the cost is low after mass use. No matter what kind of carrier is needed, a good video encoding compression algorithm is needed. A good algorithm can reduce the video stream and storage capacity as much as possible while ensuring the image quality and clarity. Poor IP high-definition cameras often produce mosaics or water ripples under large amounts of activity, which directly affects video image quality.
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