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Nine Factors Affecting the Using Effect of IP Cameras(2021年)

bit-cctv — 2021-10-11T18:36:18+0900

The effect of IP cameras is affected by many factors. The use of cameras in the market is already very extensive, but IP cameras have become one of the most popular cameras. So what is it affected by?

What factors affect the effect of IP cameras

1. Lens

The lens is the first checkpoint of video capture. The quality of the lens will naturally affect the effect of the video. Although there are many kinds of lenses, they have a great impact on the video effect. The price of the lens ranges from tens of yuan to tens of thousands of yuan. But in the surveillance field, it is unrealistic to buy a lens of tens of thousands of yuan, so basically the lenses on the market are almost the same. However, the impact of the focal length of the lens on the video effect is worth noting, which means that you should consider whether to choose a model with replaceable lens or whether to choose a zoom lens when buying a product. Having said that, I have to mention that zoom means that the focal length of the lens can be changed. Some IP cameras have the function of digital zooming. Digital zooming means that the video image can be magnified and it will not change the clarity of the image at all, which is of little value to the application of IP cameras. Especially customers should beware of disguised replacement of concept of some unprofessional sales staff or unscrupulous merchants.

2. Image sensor

This is a key factor that affects the effect of the video. At present, there are two kinds of CMOS and CCD image sensors on the market. In terms of imaging, the imaging permeability and sharpness of the CCD under the condition that the pixel is the same are very good, and the color rendition and exposure can be guaranteed to be basically accurate. While ordinary CMOS products are often weak in permeability and have weak color rendition capabilities (the color of the monitored object is quite different from the one seen on the monitor, or even the object is completely discolored), and the exposure is not very good. Due to its own physical characteristics, there is still a certain gap between the imaging quality of ordinary CMOS and CCD. CMOS video images have better artistic effects, just like people taking artistic photos. Everyone knows that artistic photos are beautiful but not realistic. People are usually confused by their artistic effects and ignore the importance of clarity and fidelity. In fact, these two points are very important in the monitoring industry.

3. Video compression algorithm (also called video compression format).

This is the most important key factor in an industrial IP camera, because it directly determines video clarity, video fluency, and video storage space. According to our experience in the industry for many years, this most important factor is always ignored by the sellers intentionally or unintentionally. The reason may be that the sellers themselves cannot tell the truth, or they want to sell seconds at best quality prices. But as a savvy buyer, you should understand this point clearly. Currently, the IP cameras on the market mainly have two video compression algorithms, H.264 and MPEG4. The former has stronger compression capability and less video loss, so it is clearer and smoother. The former can support a frame rate of 25 frames per second, and the latter generally can support the frame rate that does not exceed 10 frames per second. This means that the latter's video is incoherent and not real-time; because the MPEG4 compression rate is not enough, if the full real-time video is done, the code stream is too large, and it is difficult to see it remotely.

4. Image format

The image format determines the actual pixels of the video image. It is divided into DVD format, VGA (640*480) format and CIF (352*288) format. The DVD image formats include five kinds of image formats, D1 (720*576 interlaced scanning), D2 ( 1048*720), D3 (1920*1080 interlaced scanning), D4 (1280*720 progressive scanning) and D5 (1920*1080 progressive scanning). The mainstream currently on the market is D1. Now cameras with megapixels that support D3 and D4 are also on the market, but because they occupy too much bandwidth, they are not widely used.

Different image formats have different pixels and sizes of video file. If the image format is not the same, we cannot determine the pros and cons of an IP camera based on the size of the hard disk required for video. The image format of an IP camera can often be adjusted, which means that if your hard disk space is not large enough, but you need to record a video for a long time, you can reduce the image format to achieve this.

5. Frame rate

As we all know, any video file is composed of continuous pictures. A picture is called a frame. For example, a second video is composed of 25 continuous pictures, and the frame rate at this time is 25 frames per second. In the PAL format, video with 25 frames per second can perform very realistic actions. If it is less than 25 frames, the motion in the video will not be coherent enough. Therefore, the frame rate is very important in video surveillance. This parameter will be displayed on the video monitoring interface. This parameter is also avoided to talk about by many unprofessional salesmen. Everyone must pay attention to this factor when buying products, because the cost of the IP camera that can support 25 frames per second is also quite different from the cost of camera that cannot.

6. Dual stream

Some IP cameras are designed to support two video signals, the so-called dual stream. The advantage of dual stream is that using one stream to watch and another one to store can prevent network congestion more effectively than using only one stream for viewing and storage, so as to better ensure the smoothness of the video on the effective network bandwidth.

7. Front-end storage

Some IP cameras have SD card slots or USB mobile storage interfaces, which we call front-end storage. Front-end storage is often used in monitoring environments with insufficient bandwidth. In some environments, it is inconvenient to install broadband. Using the front-end storage function to save the surveillance video so as to achieve a certain surveillance effect is also an applicable method.

8. Product line

In most large surveillance systems, multiple models of products are often used, because the current video management software of various manufacturers is difficult to be compatible with IP cameras of other brands. Therefore, when we are choosing a brand for the monitoring system, it is necessary to consider whether the brand has a rich product line to meet the needs of various environments, as well as great system resolution capabilities. For example, whether the products support infrared, WIFI wireless, POE, fiber access, PTZ, zoom, and whether there is a video server so that it can be combined with some special analog cameras, and whether there is a video decoder that can be connected to the TV wall, etc.

9. Software functions

Most surveillance systems need to be managed centrally, so whether the video management software is powerful and whether the interface is user-friendly are also issues that must be considered during product selection. There are many functional modules of management software. Therefore, the evaluation of the pros and cons of video management software requires comprehensive consideration. A certain function cannot be exaggerated or ignored. The selection must be based on actual needs.

In addition to the above nine items, functions such as infrared night vision, ultra-low illumination, wide dynamic range, and strong light suppression are also some of the important parameters of IP cameras. In summary, the selection of IP cameras requires certain professional knowledge and patience. Don't choose the expensive one, just choose the right one. I hope you can choose your own suitable IP camera.

Blue Icon is a professional camera housing manufacturer, we provide cctv surveillance solutions, pan & tilt system, optical zoom security camera system, pan and tilt system, pan tilt positioner and etc. Want to know more? Please contact us.

How to Choose Low-light Cameras and Infrared Cameras(2021年)

bit-cctv — 2021-10-11T18:35:46+0900

https://www.bit-cctv.com/products/ptz-camera/

Ultra-low-light cameras are hot spot products in the surveillance industry that have been launched in recent years with the development of semiconductor technology. It has been widely used in the fields of finance, cultural museums, hotels, office buildings, and property management in residential quarters. Since traditional cameras cannot meet the demand for continuous 24-hour surveillance (because it is impossible to turn on the lights 24 hours in any location), new technology-based ultra-low-light cameras have seized this opportunity and developed rapidly.

General ultra-low-light cameras mostly adopt exview had technology. The sensitivity to external light of cameras that adopt exview had ccd will be greatly increased. In the near-infrared region, the sensitivity can be increased to 4 times that of ordinary cameras, such as (Figure 1). Therefore, even in a very dark environment, this camera can usually see objects invisible to the human eye. The emergence of this technology is welcomed by the surveillance market, and the camera can achieve the best effects in various lighting environments. Especially when it is matched with special infrared lighting equipment, high-definition black-and-white images can be obtained, and 0-illuminance monitoring can be achieved (in the case of completely no light). In the near-infrared region of 760mm-1100mm, if it is combined with infrared illumination with the appropriate wavelength, clear black and white images can be achieved.

Similarly, the method of obtaining images under low illuminance is to increase the amount of exposure of the ccd in a single frame of image by accumulating a single frame of charge, thereby increasing the sensitivity of the camera to a single frame of image. This method can also obtain low illuminance indicators, but the cost is the coherence of the image will be reduced, so when choosing this camera, be careful not to use it with the PTZ as much as possible, otherwise it will give rise to the phenomenon of losing the picture. There are some other methods for obtaining images under low illuminance, but none of them can fundamentally solve the illuminance problem.

In addition, there are several points to note when choosing to use low-light cameras and infrared lamps.

First, the appropriate lens must be selected. In order to improve the camera's sensitivity to infrared lights and scenes, a lens with a large luminous flux should be used as much as possible, and attention should be paid to increasing the drive level value of the aperture as much as possible when using an automatic diaphragm or a motorized two-variable lens. Generally, as the focal length of the lens increases, the luminous flux will be relatively reduced. When choosing an infrared lamp, you must leave a certain margin and pay attention to the nominal index of the infrared lamp.

Second, the optional power supply of the infrared lamp should meet the minimum electric power required by it as much as possible. The situation that irradiation distance is insufficient occurs frequently.

Third, consider the degree of reflection of the photographed scene. Since infrared has the same characteristics as visible light, such as reflection and refraction, the distance margin should be considered if there is no good reflective environment (such as buildings, walls, signs) around the target scene.

At present, in terms of the low-light cameras advertised on the market, both manufacturers and importers have different opinions on the definition of low-light. There is no agreement. Color cameras range from 0.0004 lux to 1 lux, and black and white cameras range from 0.0003 to 0.1 lux. (If they are matched with infrared, they can both reach 0lux). This is the case that there is no uniform standard for the technical specifications of the cctv industry in the domestic market, and each manufacturers has its own words.

People in the industry emphasize that how low the illuminance can be depends not only on the aperture size (f value) of the lens, but also on the conditions under which the marked lux value can appear, otherwise it is just a game of numbers! In terms of aperture size (f value), the larger the aperture, the smaller the f value it represents, and the lower the required illuminance. In addition, customers should understand clearly issues such as is the electronic sensitivity improved; what is the cumulative frame number of a single screen; is infrared on or off..., so as not to be confused by the illuminance value indicated in the specification. The evolution of low-light cameras in the Chinese market is simply divided into the following three steps: daytime color/night black and white (color/mono); low-speed shutter (slow/shutter) and super sensitivity cameras (exview/had).

1. Daytime color/night black and white (day and night camera color/mono)

There are still groups of people with demands for such cameras in the market. The lowest marked value of illuminance of day and night (color/mono) cameras is even 0lux in the domestic market. We cannot help asking: "The camera is made according to optical principles. How can imaging be made at 0 illuminance?"

The daytime color/night black and white (color/mono) camera uses the characteristic that black and white images have high sensitivity to infrared rays. Under certain light source conditions, the image is switched from color to black and white by means of circuit switching to facilitate the matching with infrared rays. In the process of technological evolution of color/black and white circuit switching, this type of camera has adopted a single ccd (color) design, which means it is a color camera during the day or when the light source is sufficient, and when the night falls or the light source is insufficient (usually 1lux to 3lux), the color signal is eliminated by the digital circuit and images become black-and-white. Besides, in order to match the infrared, the indispensable infrared filter of the color camera is also removed. The real "low-light camera" should refer to the achievable functions of camera itself (the components and technology used), while daytime color/night black and white camera itself cannot be changed due to the limitation of ccd sensitivity. It only uses circuit switching and infrared light to improve the functions, which can not be regarded as low-light cameras.

2. Slow/shutter

This type of camera is also called (picture) accumulation camera. It uses computer memory technology to continuously accumulate several blurry pictures due to insufficient light to form a clear picture. Slow shutter technology is used to lower the the illuminance of camera to 0.008lux/f1.2 (×128), and its number of frames that can be accumulated (128 frames) is at the leading level even when it is competed with imported brands. This type of low-light camera is suitable for museums that prohibit red and ultraviolet damage, observation of biological activities at night, surveillance of military coastlines at night, and the surveillance of places with relatively static properties.

3. Super sensitivity camera (exview/had)

The super sensitivity camera (exview/had), also known as the 24-hour camera, has a color illuminance of up to 0.05 lux, and a black and white illuminance of up to 0.003 to 0.001 lux (it can also be used with infrared to reach 0 lux), which not only can clearly identify the image, but also record real-time continuous pictures.

Blue Icon is a professional camera housing manufacturer, we provide surveillance camera surveillance camera, pan & tilt system, optical zoom security camera system, pan and tilt system, ptz cameras and etc. Want to know more? Please contact us.

Common Misunderstandings in the Purchase of Night Vision Cameras(2021年)

bit-cctv — 2021-10-11T18:35:18+0900

https://www.bit-cctv.com/products/long-range-laser-night-vision-ptz-camera/

Users' misunderstandings of night vision cameras can easily affect the purchase and the later using experience of the camera. This article sorts out the common misunderstandings in the industry at present, so that readers can better understand night vision cameras:

Misunderstanding 1: Night vision cameras can only see black and white images

In people's traditional impression, it is easy to associate "night vision" with "black and white", but now with the development of low-light and ultra-low-light technology, as well as the progress of sensors and chips, the camera can also achieve full-color functions at night. At present, in the industry, cameras need to work 24 hours a day, and night vision capability is an important indicator, so many manufacturers are competing in this regard.

But it is worth noting that although many night vision PTZ cameras can provide full-color functions, they still have a certain relationship with the light. If the ambient lighting conditions are within the illuminance range supported by the camera, an additional fill light is needed to collect the corresponding image information.

Misunderstanding 2: There is no defect in the technology of night vision camera

There are currently three main types of mainstream night vision technologies: starlight, black light, and AI super low light. Starlight technology relies on image sensors, black light relies on supplementary light, and AI ultra-low light relies on algorithms. Because of different implementation forms, there will still be differences in some scenes: Starlight technology uses starlight-level image sensors which are equipped with lens with a large aperture. Although it can expand the amount of light, but also reduce the depth of field of the image. Therefore, if it is used in scenes such as the traffic block port, it is still necessary to quickly capture moving people and objects, so there are certain requirements for the shutter speed. If it is not handled properly, it is easy to capture invalid image; black light technology adopts the combination of infrared light + LED warm light and supplementary light, which is easily affected by foreign objects, such as anti-explosion film pasted on car glass, people wearing anti-infrared clothing, which can cause color distortion.

Misunderstanding 3: Night vision cameras can see more clearly during the day

The imaging of the camera depends on many factors, such as depth of field, wide dynamics, resolution, weather, etc., so comprehensive evaluation is required. The night vision function of the camera cannot change the above factors, so the low-light technology will not change the effect of the camera during the day.

Misunderstanding 4: Buying night vision cameras mainly depends on performance parameters

Often users will equate performance parameters with the night vision performance capabilities of the product, which is actually too one-sided. In fact, many users find that these performance parameters are not equivalent to the actual performance capabilities of the camera after purchasing the camera.

Without comparing different models of the same brand, users will not be able to feel the difference between these models with different performance parameters. Although in the short term, this purchase method can be satisfying, but in the long run, it is difficult to ensure the true applicability of the camera if users focus solely on the parameters.

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How to Classify Cameras in the Security System(2021年)

bit-cctv — 2021-10-11T18:34:50+0900

https://www.bit-cctv.com/products/long-range-laser-night-vision-ptz-camera/

In the security system, image generates mainly from CCD cameras. CCD is the abbreviation of charge coupled device, which can change light into electric charge, store the charge and transfer it. Also, it can take out the stored charge to change the voltage, which is an ideal camera component. CCD cameras are widely used because of CCD's small volume, light weight, not affected by magnetic field, and anti-vibration and anti-impact characteristics.

CCD cameras can be roughly divided into the following categories:

By imaging color

(1) A color camera: It is suitable for distinguishing the details of the scenery, such as distinguishing the color of clothes or scenery. Due to the color, the amount of information increases, which is generally considered to be 10 times that of a black-and-white camera.

(2) A black-and-white camera: It is used in areas with insufficient light and areas where no lighting equipment can be installed at night. When the location or movement of the object is being monitored, a black-and-white camera with a resolution usually higher than that of a color camera can be selected.

By camera resolution

(1) A low-end type with an image pixel about 250,000 pixels, a color resolution of 330 lines, and a black-and-white resolution of 420 lines.

(2) A mid-range type with an image pixel between 250,000 and 380,000 pixels, a color resolution of 420 lines, and a black-and-white resolution of 500 lines.

(3) A high-resolution type with an image pixel over 380,000 pixels or more, a color resolution is greater than or equal to 480 lines, and a black-and-white resolution of 570 lines or more.

By camera sensitivity

(1) Normal type: The illumination required for normal work is 1~3lux

(2) Moonlight type: The illuminance required for normal work is about 0.1 lux

(3) Starlight type: The illumination required for normal work is below 0.01 lux

(4)Infrared illumination type: In principle, it can be 0 lux and use infrared light source for imaging.

By the size of the CCD target surface of the imaging components

(1) The size of the 1 inch target surface: 12.7mm (width) x 9.6mm (height), 16mm (diagonal)

(2) The size of the 2/3 inch target surface: 8.8mm (width) x 6.6mm (height), 11mm (diagonal)

(3) The size of the 1/2 inch target surface: 6.4mm (width) x 4.8mm (height), 8mm (diagonal)

(4) The size of the 1/3 inch target surface: 4.8mm (width) x 3.6mm (height), 6mm (diagonal)

(5) The size of the 1/4 inch target surface: 3.2mm (width) x 2.4mm (height), 4mm (diagonal)

(6)The 1/5 inch target surface is under development and no official product has been launched yet

In addition, CCD cameras are divided into pal system and ntsc system, and can also be divided according to the image signal processing method or the camera structure.

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Working Principle of Infrared Thermography and Brief Introduction to Infrared Detector(2021年)

bit-cctv — 2021-10-11T18:34:24+0900

https://www.bit-cctv.com/products/cctv-power-adaptor/

The working principle of infrared thermal imaging and an introduction to infrared detectors.

The corona virus can spread through droplets formed by coughing and breathing. Therefore, epidemic monitoring and prevention in public areas have become an important link in curbing the epidemic. During the Spring Festival travel season, airport hubs, high-speed rail stations, passenger terminals and other places hold a large passenger flow with crowded people everywhere, so the preliminary inspection of the crowd is of great significance. The symptoms of patients with the corona virus mainly reflect as fever, cough, dyspnea, and fatigue. Therefore, temperature screening has become one of the main methods of epidemic surveillance in public areas.

Judging from the current research situation, the body temperature screening equipment in public areas is mainly non-contact, including mobile screening systems, fixed screening systems, and handheld screening equipment. Compared with traditional contact temperature screening equipment (thermometers, etc.), non-contact equipment can rely on infrared intensity to perform online temperature monitoring of the target, achieve efficient and rapid screening of passing people, and greatly improve the screening efficiency.

Infrared is also known as infrared heat radiation with the wavelength ranging from 0.76 μm to 1000 μm between microwave and visible light. The amount of infrared energy is directly related to the temperature of the surface of the object and the characteristics of the material. The higher the temperature is, the greater the infrared energy will be.

The infrared screening instrument determines the temperature of the object through the amount of infrared radiation energy emitted by the object.

To put it simply, infrared temperature screening is carried out in three steps:

The first step is to use infrared detectors sensitive to infrared radiation to convert infrared radiation into weak electrical signals, the size of which can reflect the strength of infrared radiation;

The second step is to use the follow-up circuit to amplify and process the weak electrical signal so as to clearly collect the temperature distribution of the target;

The third step is to process the above-mentioned amplified electrical signal through image processing software to obtain an electronic video signal. The TV display system displays the electronic video signal reflecting the target's infrared radiation distribution on the screen to obtain a visible image.

The infrared screening system can be divided into the chip, the detector, the movement and the whole machine. Infrared MEMS chip is the core component of infrared imaging system, which is at the upstream end of the entire infrared imaging industry chain. The infrared MEMS chip gathers the infrared light signals collected by the infrared optical system into the detector, and converts the infrared light signals into weak electrical signals for output through the IC and MEMS system.

The design, production and research and development of infrared detectors involve such fields as materials, integrated circuit design, refrigeration and packaging. The technology is so difficult that at present only a few countries can master the core technology of uncooled infrared detectors, which are the United States, France, Israel, and China.

The movement is composed of a detector and an image processing circuit with a common algorithm.The working principle of the movement is to process and digitize the weak electrical signal output by the detector, and process the digitized signal through an algorithm for image and temperature quantitative processing, and finally convert the temperature distribution map of the target object into a video image.The whole machine is a complete system composed of infrared optical system, movement, intelligent processing circuit, battery, casing, display screen, etc.

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Global Network Surveillance Market to Reach $2.93 Billion by 2023(2021年)

bit-cctv — 2021-10-11T18:33:55+0900

https://www.bit-cctv.com/products/camera-housing-enclosure/

The constantly evolving software-defined network market provides new development opportunities for the global network surveillance market.

MarketsandMarkets, the world's second-largest market research institution, recently released a report that the global network surveillance market was valued at US$1.67 billion in 2017, and the global network surveillance market in 2018 was approximately US$1.82 billion. Due to the gradual increase in network complexity and security issues, it is estimated that by 2023, the market size will reach 2.93 billion US dollars. The compound annual growth rate (CAGR) during the forecast period (2018-2023) is 9.9%.

It is understood that after a survey of the target audiences(network monitoring equipment manufacturers, network monitoring product traders/suppliers, companies involved in the network monitoring equipment business ecosystem, telecommunications service providers, cloud service providers, system integrators, etc.) of the global network surveillance market, MarketsandMarketsd divides the global network surveillance market into the following sub-markets: network surveillance market providers (equipment, solution and service providers), broadband (1 Gbps and 10 Gbps, 40 Gbps, 100 Gbps), technology (Ethernet, optical fiber, and InfiniBand) and end users (enterprise, telecommunications, government organizations, and cloud service providers).

The report believes that the emergence of more and more companies with strict and high requirements has promoted the growth of demand for network monitoring equipment. Due to the increasing complexity of network architectures, application delivery requires highly reliable and scalable network monitoring equipment. With the powerful network monitoring functions of such equipment, it can ensure the smooth operation of critical mission network infrastructure and quickly resolve downtime and other issues. At the same time, it promotes the development of the network monitoring equipment market. In addition, the constantly evolving software-defined network market provides new development opportunities for the global network surveillance market.

The report also points out that in today's Internet + era, information-driven organizations or companies are facing the basic challenge of balancing the high availability of business-critical information and maintaining its integrity and security. The network monitoring equipment can continuously monitor the company's network vulnerabilities, configurations, and current important network events, and timely discover suspicious activities that may attack the company. In other words, network monitoring can minimize the downtime of electronic equipment in information-driven organizations or companies, thereby saving the company's time and other costs.

After surveying the network surveillance market in North America, Europe, Asia Pacific (APAC) and other regions of the world, the it found that: Gigamon (United States), NetScout Systems, (NetScout) (United States), Ixia (United States), VIAVI Solutions ( Viavi) (United States), APCON (United States) and Garland Technology (United States) are leading companies in the global network surveillance market. And Broadcom (Broadcom) (United States), Juniper Networks (United States), Big Switch Networks (United States), Zenoss (United States), Network Critical (United Kingdom), Corvil (Ireland), CALIENT Technologies (CALIENT) (United States), Netgear (United States) ) and Motadata (USA) are also some of the major companies in the global network surveillance market.

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Global Chip Shortage - Chip Prices Are Once Again on the Rise(2021年)

bit-cctv — 2021-10-11T18:33:27+0900

https://www.bit-cctv.com/products/

According to a CCTV financial report, chip prices have risen continuously in recent years, and chips have changed from being unavailable to unaffordable. The latest research report of Goldman Sachs pointed out that as many as 169 industries around the world have been hit by the shortage of chips to some extent, including steel products, concrete production, air-conditioning manufacturing, beer brewing, soap production and many other industries.

The accelerated global "chip shortage" has made rise in the price of chip unaviodable. "Unavailable" and "unaffordable" have become a common dilemma faced by many downstream companies. A practitioner told a reporter that the price of a German-made chip they used was 3.5 yuan last year, and this year it has risen to 16.5 yuan, which means the price of a chip they use has grown 500 percent.

The epidemic has caused many processing plants around the world to fail to operate in time, home office and online training have become normal in many areas, and the demand for consumer electronic products has soared.

Earlier, Elon Musk also admitted that the shortage of chips has caused serious damage to the supply chain of electric car manufacturers. He also accused many companies of ordering microcontrollers in excess of demand, just like consumers rushing to buy toilet paper in the early days of the epidemic.

He said: "Our biggest challenge is the supply chain, especially the supply of micro-controller chips. I have never seen anything like this before. People worry chips will be in short supply, every company is overbooked, which is like a toilet paper shortage, but on a much larger scale."

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