Webcam clever tips
2024-04-22 22:06:32
[ Huaqiang Security Network News ] In the current security surveillance industry, the development of network cameras is very fast, and many places must be applied to network cameras, but many people do not understand it, which casts a mysterious veil on the network cameras. Here is a secret to everyone how to buy a network camera.
First, let everyone know about the network camera and be a knowledgeable buyer.
First, know the network camera:
We need to first understand the network camera. The network camera, also called IP CAMERA (referred to as IPC), is composed of a network coding module and an analog camera. The network coding module compresses the analog video signal collected by the analog camera into a digital signal, so that it can directly access the network switching and routing equipment (the two products of the switch and the router are familiar to the users with the network), and then access the Internet. IPC comes with an IP address, and some brands of IPC also come with a domain name. Users in the LAN can view the surveillance video and control and manage the video by logging in to the IP address of the IPC. Remote users can view, control, manage, and record IPCs by logging in to the IPC's domain name.
Compared with analog cameras, IPC can realize monitoring more easily, especially remote monitoring, simpler construction and maintenance, better support for audio, better support for alarm linkage, more flexible video storage, richer product selection, and more. High-definition video effects and better monitoring management. In addition, IPC supports WIFI wireless access, 3G access, POE power (network power) and fiber access. In short, the emergence of IPC has a milestone historical significance for the network and security industry.
Most IPCs are similar in size to analog cameras. Since IPC is often used in homes and offices, IPC has a richer and more beautiful look.
The value of IPC is enormous.
After a brief understanding of IPC, you must be ready to move! So, what should you pay attention to when buying IPC? How can I buy a good product that suits me? This has to understand what are the key parameters of IPC.
Second, several key parameters of the network camera
1) Lens lens is the first pass of video capture. The quality of the lens will naturally affect the effect of the video. Although there are many kinds of lenses, the effect on the video is very large. The price of the lens ranges from tens of yuan to several tens of thousands. However, in the field of surveillance, it is not enough to buy a lens of tens of thousands of dollars, so basically the lenses on the market are similar. However, the effect of the focal length of the lens on the video effect is worth noting, which means that you should consider whether to choose the model of the interchangeable lens, or consider whether to choose the lens for zooming. Speaking of this, I have to mention that the zoom refers to the focal length of the lens can be changed. Some IPCs have a digital zoom function. Digital zoom means that you can zoom in on the video image without changing the image's sharpness. It is of little value to IPC. In particular, beware of some unprofessional sales people or JS stealing concepts.
2) Image sensor This is a key factor affecting the video effect. At present, there are two kinds of CMOS and CCD on the market. In terms of imaging, the imaging transparency and sharpness of the CCD are very good under the same pixel, and the color reproduction and exposure can ensure basic accuracy. Ordinary CMOS products tend to be generally transparent, and the color reproduction ability of the object is weak (the color of the object being monitored is quite different from that seen on the monitor, or even completely discolored), and the exposure is not very good, because Due to its own physical characteristics, there is still a gap between the imaging quality of ordinary CMOS and CCD. CMOS video images are better artistic, just like people follow art photos. Everyone knows that art photos are beautiful but not realistic. People are often confused by their artistic effects and ignore the importance of clarity and fidelity. In fact, these two points are very important when monitoring the industry.
3) Video compression algorithm (also called video compression format).
This is the most important key factor in IPC because it directly determines video clarity, video fluency, and video storage space. After many years of understanding, this most important factor has always been avoided by the seller intentionally or unintentionally. The reason may be that it cannot be said to be in itself or has a shoddy motivation. But as a savvy buyer, you must understand it. Currently, IPC on the market mainly has two video compression algorithms, H.264 and MPEG4. The former is more compact and has less video loss, so it is clearer and smoother. The former can support a frame rate of 25 frames/second, and the latter generally does not exceed 10 frames/second. This means that the latter video is incoherent and not real-time; because the MPEG4 compression rate is not enough, if the real-time, the code stream is too large, the remote is difficult to see.
4) Image format The image format determines the actual pixels of the video image. It is divided into DVD format and VGA (640*480) format and CIF (352*288) format. The DVD image format family includes D1 (720*576 interlaced scanning). ), D2 (1048*720), D3 (1920*1080 interlaced), D4 (1280*720 progressive scan) and D5 (1920*1080 progressive scan) five image formats, currently the mainstream D1 on the market The megapixels that support D3 and D4 are also on the market, but because they use more bandwidth, the application is not widely available.
Different pixels in the same image format are different, and the video file size is different. If it is not the same image format, we can't determine the pros and cons of IPC by the size of the hard disk required for the video. An IPC image format can often be adjusted, which means that if your hard disk space is not large enough, but you need to record for a long time, you can achieve by reducing the image format.
5) Frame rate is well known. Any video file is composed of consecutive pictures. We call it a frame for a picture. For example, a one-second video consists of 25 consecutive pictures. The frame rate is 25 frames. /second. In the PAL system, 25 frames per second of video can be very realistic. If it is less than 25 frames, the motion in the video will not be coherent, and the lower the inconsistency, the even more jumping motion artifacts will appear. Therefore frame rate is very important in video surveillance. This parameter will be displayed on the video monitoring interface. This parameter is also avoided by many unprofessional salespeople. Everyone must pay attention to this when purchasing products, because the IPC cost of supporting 25 frames/sec is also quite different.
6) Dual Streaming Some IPCs are designed to support two video signals, the so-called dual stream. The advantage of dual stream is that it can be more effectively protected against network congestion by using one stream stream, one stream stream storage and one channel stream for viewing and storage, thus better guaranteeing the smoothness of video on effective network bandwidth.
7) Front-end storage Some IPCs have an SD card slot or a USB mobile storage interface, which we call front-end storage. Front-end storage is often used in monitoring environments where bandwidth is not sufficient. Some environments are inconvenient to install broadband, use the function of the front-end storage, save the monitoring video to play a certain monitoring effect, can not help but also a way.
8) Product line Most of the larger monitoring systems often use a variety of models, because the current video management software of various manufacturers is difficult to be compatible with other brands of IPC. Therefore, when selecting a brand for a monitoring system, it is necessary to consider whether the brand has a rich product line to cope with various environmental needs and system solving capabilities. Such as support for infrared, support for WIFI wireless, support for POE, support for fiber access, support for pan/tilt, support for zoom, whether there is a video server for integration with some special analog cameras, and whether a video decoder can be connected to the video wall.
9) Software functions Most monitoring systems require centralized management. Therefore, whether the video management software is powerful or not, it is also a problem that must be considered when selecting products. There are many functional modules of the management software. Therefore, the identification of the advantages and disadvantages of the video management software requires comprehensive consideration. It is not possible to exaggerate a certain function, nor can it ignore a certain function.
In addition to the above nine, infrared night vision capability, ultra-low illumination, wide dynamics, strong light suppression and other functions are also some important parameters of IPC. In summary, the selection of IPC requires a certain level of expertise and more patience. If you don't choose expensive, you only choose the right one. I hope everyone can choose the right IPC.
First, let everyone know about the network camera and be a knowledgeable buyer.
We need to first understand the network camera. The network camera, also called IP CAMERA (referred to as IPC), is composed of a network coding module and an analog camera. The network coding module compresses the analog video signal collected by the analog camera into a digital signal, so that it can directly access the network switching and routing equipment (the two products of the switch and the router are familiar to the users with the network), and then access the Internet. IPC comes with an IP address, and some brands of IPC also come with a domain name. Users in the LAN can view the surveillance video and control and manage the video by logging in to the IP address of the IPC. Remote users can view, control, manage, and record IPCs by logging in to the IPC's domain name.
Compared with analog cameras, IPC can realize monitoring more easily, especially remote monitoring, simpler construction and maintenance, better support for audio, better support for alarm linkage, more flexible video storage, richer product selection, and more. High-definition video effects and better monitoring management. In addition, IPC supports WIFI wireless access, 3G access, POE power (network power) and fiber access. In short, the emergence of IPC has a milestone historical significance for the network and security industry.
Most IPCs are similar in size to analog cameras. Since IPC is often used in homes and offices, IPC has a richer and more beautiful look.
The value of IPC is enormous.
After a brief understanding of IPC, you must be ready to move! So, what should you pay attention to when buying IPC? How can I buy a good product that suits me? This has to understand what are the key parameters of IPC.
Second, several key parameters of the network camera
1) Lens lens is the first pass of video capture. The quality of the lens will naturally affect the effect of the video. Although there are many kinds of lenses, the effect on the video is very large. The price of the lens ranges from tens of yuan to several tens of thousands. However, in the field of surveillance, it is not enough to buy a lens of tens of thousands of dollars, so basically the lenses on the market are similar. However, the effect of the focal length of the lens on the video effect is worth noting, which means that you should consider whether to choose the model of the interchangeable lens, or consider whether to choose the lens for zooming. Speaking of this, I have to mention that the zoom refers to the focal length of the lens can be changed. Some IPCs have a digital zoom function. Digital zoom means that you can zoom in on the video image without changing the image's sharpness. It is of little value to IPC. In particular, beware of some unprofessional sales people or JS stealing concepts.
2) Image sensor This is a key factor affecting the video effect. At present, there are two kinds of CMOS and CCD on the market. In terms of imaging, the imaging transparency and sharpness of the CCD are very good under the same pixel, and the color reproduction and exposure can ensure basic accuracy. Ordinary CMOS products tend to be generally transparent, and the color reproduction ability of the object is weak (the color of the object being monitored is quite different from that seen on the monitor, or even completely discolored), and the exposure is not very good, because Due to its own physical characteristics, there is still a gap between the imaging quality of ordinary CMOS and CCD. CMOS video images are better artistic, just like people follow art photos. Everyone knows that art photos are beautiful but not realistic. People are often confused by their artistic effects and ignore the importance of clarity and fidelity. In fact, these two points are very important when monitoring the industry.
3) Video compression algorithm (also called video compression format).
This is the most important key factor in IPC because it directly determines video clarity, video fluency, and video storage space. After many years of understanding, this most important factor has always been avoided by the seller intentionally or unintentionally. The reason may be that it cannot be said to be in itself or has a shoddy motivation. But as a savvy buyer, you must understand it. Currently, IPC on the market mainly has two video compression algorithms, H.264 and MPEG4. The former is more compact and has less video loss, so it is clearer and smoother. The former can support a frame rate of 25 frames/second, and the latter generally does not exceed 10 frames/second. This means that the latter video is incoherent and not real-time; because the MPEG4 compression rate is not enough, if the real-time, the code stream is too large, the remote is difficult to see.
4) Image format The image format determines the actual pixels of the video image. It is divided into DVD format and VGA (640*480) format and CIF (352*288) format. The DVD image format family includes D1 (720*576 interlaced scanning). ), D2 (1048*720), D3 (1920*1080 interlaced), D4 (1280*720 progressive scan) and D5 (1920*1080 progressive scan) five image formats, currently the mainstream D1 on the market The megapixels that support D3 and D4 are also on the market, but because they use more bandwidth, the application is not widely available.
Different pixels in the same image format are different, and the video file size is different. If it is not the same image format, we can't determine the pros and cons of IPC by the size of the hard disk required for the video. An IPC image format can often be adjusted, which means that if your hard disk space is not large enough, but you need to record for a long time, you can achieve by reducing the image format.
5) Frame rate is well known. Any video file is composed of consecutive pictures. We call it a frame for a picture. For example, a one-second video consists of 25 consecutive pictures. The frame rate is 25 frames. /second. In the PAL system, 25 frames per second of video can be very realistic. If it is less than 25 frames, the motion in the video will not be coherent, and the lower the inconsistency, the even more jumping motion artifacts will appear. Therefore frame rate is very important in video surveillance. This parameter will be displayed on the video monitoring interface. This parameter is also avoided by many unprofessional salespeople. Everyone must pay attention to this when purchasing products, because the IPC cost of supporting 25 frames/sec is also quite different.
6) Dual Streaming Some IPCs are designed to support two video signals, the so-called dual stream. The advantage of dual stream is that it can be more effectively protected against network congestion by using one stream stream, one stream stream storage and one channel stream for viewing and storage, thus better guaranteeing the smoothness of video on effective network bandwidth.
7) Front-end storage Some IPCs have an SD card slot or a USB mobile storage interface, which we call front-end storage. Front-end storage is often used in monitoring environments where bandwidth is not sufficient. Some environments are inconvenient to install broadband, use the function of the front-end storage, save the monitoring video to play a certain monitoring effect, can not help but also a way.
8) Product line Most of the larger monitoring systems often use a variety of models, because the current video management software of various manufacturers is difficult to be compatible with other brands of IPC. Therefore, when selecting a brand for a monitoring system, it is necessary to consider whether the brand has a rich product line to cope with various environmental needs and system solving capabilities. Such as support for infrared, support for WIFI wireless, support for POE, support for fiber access, support for pan/tilt, support for zoom, whether there is a video server for integration with some special analog cameras, and whether a video decoder can be connected to the video wall.
9) Software functions Most monitoring systems require centralized management. Therefore, whether the video management software is powerful or not, it is also a problem that must be considered when selecting products. There are many functional modules of the management software. Therefore, the identification of the advantages and disadvantages of the video management software requires comprehensive consideration. It is not possible to exaggerate a certain function, nor can it ignore a certain function.
In addition to the above nine, infrared night vision capability, ultra-low illumination, wide dynamics, strong light suppression and other functions are also some important parameters of IPC. In summary, the selection of IPC requires a certain level of expertise and more patience. If you don't choose expensive, you only choose the right one. I hope everyone can choose the right IPC.
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