Analog CCTV Systems

Analog Security Cameras

Advantages

  • Cost: Analog cameras tend to cost less, sometimes even a lot less, than their digital counterparts on a per camera basis.
  • Simplicity: DVR is easier to set up and understand for most. It is one unit with one cost, and the installation is a bit more straightforward.
  • Lower Bandwidth Requirements: Analog recorded video files tend to be smaller, and they are transmitted to the DVR over coax instead of LAN, so transmitting them doesn’t take as much bandwidth and doesn’t tax your network as much. Plus, DVRs also usually only transmit the information and use bandwidth when someone is viewing the video, rather than on a more constant basis.
  • More Design Options: With a wider variety of analog camera designs, you may have an easier time finding a camera model with all of the features you need at a lower cost.

There are two types of closed circuit TV (CCTV) systems: digital and analog. In the past, the latter was the only option and video surveillance was based on analog technology -closed circuit television (CCTV), and then recorded on video tapes. This system simply recorded in the moment activity for future access. However, since it does not broadcast actual live information, it is not practical for monitoring stores from a remote location. The picture quality is also low and often unusable, and it relied on human reliability as well, such as changing the tapes regularly. Analog technology at one time served a purpose for security monitoring, but now digital CCTV is revolutionizing security measures and technology has evolved to allow for a more diverse security monitoring system.

With digital CCTV, a digital camera views the scene in front of the lens and broadcasts the video images as a digitized signal over a LAN line (Local Area Network) where it’s then transmitted to a computer or server. In turn, the server manages all of this information. Depending upon the software used to manage the digital images, it can record, display or retransmit the images to anywhere in the world. Even more, the software package can be upgraded to allow for data analysis, such as selecting specific flagged items to monitor, in addition to a host of other functions that truly make it a customizable security tool.

True IP-based digital surveillance uses CCD cameras that employ signal processing with the purpose of sending packetized video streams over the LAN through a Cat 5 cable rather than a coax cable network. This system provides more intelligent data mining and information retrieval. If security is an issue, full digital surveillance offers the added advantage of data encryption opportunities to protect against image tampering; something not possible with analog recording. Recently, a few companies such as D-Link and Linksys have developed fully digital cameras that have completely integrated, built-in web servers so that external computers are no longer required. In this case, the signal is transmitted directly to the terminal location for storage or play-back.

The main difference between the two camera types is the way in which the video signal is delivered. Analog cameras turn the video signal into a format that can be received by a television or other receiver such as a VCR or monitor. An IP-based camera, also known as an IP network camera, digitizes the video signal using a specialized encoder that contains an onboard web server. This allows the IP camera to act as a network device, thus allowing captured video images to be viewed not only through an existing network, but also through a web browser that can be accessed through the Internet.

I feel like this paragraph is written in a different, more casual voice that’s easier for the average person to understand.

The advantage of a digital system over an analog is clear, and by that I mean literally – better picture quality. After all, the whole point of a Video Surveillance System is to see exactly what is happening in the moment. How many times have you heard about or seen grainy footage of a perpetrator committing a crime that was taken by a traditional CCTV system? Most often you can’t make out more than a fuzzy form and the images are useless to law enforcement. In addition to quality, digital cameras also cover a larger area. For instance, if you have both camera types (digital and analog) aimed to show the same coverage area, the digital image results in an image more than three times larger than the analog camera. That larger picture of the same area translates into more image detail and clearer image quality. On the other side, we have a situation where increased coverage area is desirable over increased detail.- this sentence doesn’t make sense to me???) The digital camera’s larger coverage area also means that fewer cameras are needed on the property. With higher tier IP cameras surpassing the ten megapixel benchmark, it is clear that analog CCTV has been outdone. The fact is that traditional CCTV cameras have reached the end of their evolution, and cannot compete with high resolution Digital Surveillance Cameras.

Some hotels will move to the hybrid models of a CCTV/DVR system when they first move beyond an analog system because it seems like the next practical evolutionary step in video surveillance. However, shifting to this method largely ignores how IP-based video surveillance works. With CCTV/DVR surveillance, you have actually simply delayed the inevitable of adding on a relatively new technology (hard disk, digital storage) to an old technology (analog video over coaxial transmission lines). Rather than moving forward into something new, you have prolonged the demise of the old.

While an analog camera is ideal if you want to monitor one location from a fixed position, an IP camera is more flexible and can enable more sophisticated surveillance, recording and review. IP cameras can deliver high definition or megapixel images, which give greater detail and can cover a greater range. All the more, they can be powered over a network using Power over Ethernet (PoE) that does not require a separate power supply. Some IP cameras have audio recording built in which allows recorded messages to be broadcast automatically to warn people that they are being watched. However, this functionality can be integrated into any camera’s housing, and is not a specific benefit of IP. Both types of cameras can feature infrared technology to capture full-color images during the day and black-and-white images in low light or even complete darkness.

Even at the highest resolution available for CCTV, the clarity of rapidly moving objects, such as a person running or speeding car, has long been problematic in security and surveillance applications. In an analog CCTV environment, a rapidly moving object will appear blurry. This is because the video signal, even when connected to a DVR, interlaces to create the images. Interlaced images use techniques developed for analog TV monitor displays, made up of visible horizontal lines across a standard TV screen. If you happen to have shopped for a new TV lately you are probably aware that 1080i is not nearly as good as 1080P. Interlacing divides images into odd and even lines and then alternately refreshes them. The slight delay between odd and even line refreshes creates some distortion – only half the lines keep up with the moving image while the other half waits to be refreshed.

A better way to understand the differences between analog and IP-based video surveillance may be to compare the two and how they work:

Analog or CCTV+DVR

• Easy to use – operates like a VCR
• Changing and rewinding tapes – humans may interfere with effectiveness
• Image quality is poor
• Storage tapes wear out over time
• Broadcasting images live isn’t an option
• Storage is bulky
• Uses analog recording, recording in low-grade picture quality and inability to search and track easily
• Adding DVR systems must be done in blocks of 16 channels

IP-based

• IP-based recording means instant transmittal of images anywhere in the world
• Can monitor multiple cameras from one remote location
• No decrease in recording quality over time or with repeated replays
• Digital picture quality far superior to analog
• IP-base recording is highly compressed for easier storage and can be transported over a variety of media
• Digital images can be encrypted for security purposes
• Updates and add-ons are relatively inexpensive through software packages and Internet computer networking
• Adjustable frame rates
• Remote or shared viewing may be done over the Internet or a wireless connection
• Standard IP video compression techniques are used
• IP surveillance cameras may be added individually or in groups according to your needs

Security is a twenty-four-seven responsibility and maintaining a vigilant security focus can prove to be a very expensive expenditure for a hotel. The size and scale of the hotel obviously has an impact on the level and amount of security that is required for the operation. Hence, by identifying the right strategy and balance for a hotel and implementing the right systems, hotels can reduce their overall exposure while still providing a safe environment for their guests and staff. By gaining a clear understanding of the various technologies and solutions that are available or by using the assistance of a security expert, hotels can find the right solution for their environments.

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iPhone / iPad Compatible
iOS Compatible Security DVR
Android Compatible
Android Compatible Security DVR
Mac Compatible 
Mac Compatible Security DVR

The camera is divided into two categories: digital camera and analog camera. Analog cameras convert analog video signals generated by video capture devices into digital signals and store them in computers. The video signal captured by the analog camera must be converted to a digital mode by a specific video capture card and compressed before it can be converted to a computer. The digital camera can capture images directly and send them to the computer via serial, parallel, or USB interfaces. At present, the cameras on the computer market are mainly based on digital cameras, while the digital cameras are mainly based on USB digital cameras using new data transmission interfaces. Most of the cameras currently on the market are such products. There is also a product that works with video capture cards, but it is not currently mainstream.

The camera with USB interface supports true plug and play. Even if you plug in the device while working on the computer, the system will immediately report and find the appropriate driver for it; moreover, the power supply used by the USB camera can be directly Motherboard USB interface, no longer need a clumsy independent power converter; USB interface provides 12Mbps transmission bandwidth, transmission speed is much higher than the computer’s existing peripheral ports. Compared with the serial port, the USB interface is about 100 times faster; compared with the parallel port, the USB interface is nearly 10 times faster. It is not difficult to see from here that a computer camera with a USB interface has a great advantage in terms of speed.

When selecting a camera, the lens is very important. According to the category of light-sensitive devices, cameras used on the market today are mostly CCD and CMOS. Among them, the CCD (Charge Coupled Device) is a high-end technology component used in image capturing and image scanning, and the CMOS (Complementary Metal-Oxide Semiconductor) is mostly used in some low-end video products. However, such positioning does not mean that there is a big difference between the two when using a specific camera. In fact, after technological transformation, the gap between the actual effects of CCD and CMOS has been greatly reduced. The CMOS manufacturing cost and power consumption are lower than CCD, so many camera manufacturers use CMOS lenses.
However, due to its own physical characteristics, the CCD image quality and CMOS still have a certain distance. In the same pixel CCD imaging is often very good transparency, sharpness, color reproduction, exposure can guarantee the basic accuracy. The CMOS products are often transparent and have poor color reproduction capabilities. The exposure is also not very good. Therefore, we should pay more attention to techniques when using cameras, especially those using CMOS chips: First of all, do not use in the backlight environment (this CCD is the same), in particular, do not point directly to the sun, or the "magnifying glass burning ants" tragedy will happen on your camera. Second, the ambient light should not be too weak, otherwise it will directly affect the imaging quality. There are two ways to overcome this difficulty. One is to enhance the surrounding brightness, and the other is to choose a product with a minimum minimum illumination. Now some cameras can already reach 5lux (lux is the international unit of illumination.Is an international unit of illumination, equivalent to one square meter of first-class Ming), such as Samsung's AnyCam M10. The last thing to notice is the proper use of the lens zoom. Do not underestimate this. With the correct adjustment, the camera can also have the function of a camera chip. Shanghai P&T Optoelectronics Technology Co., Ltd. can provide a variety of high-resolution microscope cameras, it is different from the general video camera, but a professional high-tech equipment, generally can be used with the microscope, widely used in computer image acquisition, Portrait and human biometrics collection, pattern recognition, industrial inspection, microscopic images, and traffic management and machine vision.
The camera is divided into two categories: digital camera and analog camera. Analog cameras convert analog video signals generated by video capture devices into digital signals and store them in computers. The video signal captured by the analog camera must be converted to a digital mode by a specific video capture card and compressed before it can be converted to a computer. The digital camera can capture images directly and send them to the computer via serial, parallel, or USB interfaces. The camera on the computer market is basically based on digital cameras.The digital camera is mainly based on a USB digital camera using a new data transmission interface. Most of the products currently on the market are such products. There is also a product that works with video capture cards, but it is not currently mainstream. The camera with USB interface supports true plug and play. Even if you plug in the device while working on the computer, the system will immediately report and find the appropriate driver for it; moreover, the power supply used by the USB camera can be directly Motherboard USB interface, no longer need a clumsy independent power converter; USB interface provides 12Mbps transmission bandwidth, transmission speed is much higher than the computer’s existing peripheral ports. Compared with the serial port, the USB interface is about 100 times faster; compared with the parallel port, the USB interface is nearly 10 times faster. It is not difficult to see from here that a computer camera with a USB interface has a great advantage in terms of speed.
When selecting a camera, the lens is very important. According to the category of light-sensitive devices, cameras used on the market today are mostly CCD and CMOS. Among them, the CCD (Charge Coupled Device) is a high-end technology component used in image capturing and image scanning, and the CMOS (Complementary Metal-Oxide Semiconductor) is mostly used in some low-end video products. However, such positioning does not mean that there is a big difference between the two when using a specific camera. In fact, after technological transformation, the gap between the actual effects of CCD and CMOS has been greatly reduced. The CMOS manufacturing cost and power consumption are lower than CCD, so many camera manufacturers use CMOS lenses
However, due to its own physical characteristics, the CCD image quality and CMOS still have a certain distance. In the same pixel CCD imaging is often very good transparency, sharpness, color reproduction, exposure can guarantee the basic accuracy. The CMOS products are often transparent and have poor color reproduction capabilities. The exposure is also not very good. Therefore, we should pay more attention to techniques when using cameras, especially those using CMOS chips:
First of all, do not use in the backlight environment (this CCD is the same), in particular, do not point directly to the sun, or the “magnifying glass burning ants” tragedy will happen on your camera. Second, the ambient light should not be too weak, otherwise it will directly affect the imaging quality. There are two ways to overcome this difficulty. One is to increase the ambient brightness, and the other is to choose a product with a minimum minimum illumination. Now some cameras can already reach 5lux (lux is the international unit of illumination, equivalent to one square meter). Such as Samsung’s AnyCam M10.
The last thing to notice is the proper use of the lens zoom. Do not underestimate this. With the correct adjustment, the camera can also have the function of a camera chip.
. The CCD (Charge Coupled Device), or “charge coupled device,” is described in megapixels. The number of megapixels in a digital camera specification refers to the resolution of the CCD. The CCD is a light-sensitive semiconductor chip that is used to capture graphics and is widely used in scanners, copiers, and filmless cameras. Similar to the principle of the film, light passes through a lens and projects the graphic information onto the CCD. Unlike film, however, CCDs have neither the ability to record graphical data nor the ability to be permanently stored or even have “exposure” capabilities. All graphics data will be fed into an “analog-digital” converter, a signal processor, and a storage device (such as a memory chip or a memory card) without stopping. The CCD has a variety of sizes and shapes, the largest being 2 x 2 square inches.
Digital camera basics new links Article link: China Chemical Instrument Network http://www.chem17.com/Tech_news/Detail/20638.html First, CCD 1. The CCD (Charge Coupled Device), or “charge coupled device,” is described in megapixels. The number of megapixels in a digital camera specification refers to the resolution of the CCD. The CCD is a light-sensitive semiconductor chip that is used to capture graphics and is widely used in scanners, copiers, and filmless cameras. Similar to the principle of the film, light passes through a lens and projects the graphic information onto the CCD. Unlike film, however, CCDs have neither the ability to record graphical data nor the ability to be permanently stored or even have “exposure” capabilities. All graphics data will be fed into an “analog-digital” converter, a signal processor, and a storage device (such as a memory chip or a memory card) without stopping. The CCD has a variety of sizes and shapes, the largest being 2 x 2 square inches. 2. CCD imaging principle CCD imaging process is as follows: CCD surface coated silicon semiconductor photosensitive elements capture photons and generate photo-generated electrons, these electrons are accumulated in the insulating layer under the CCD, and then exported by the control circuit in a serial manner In the analog-to-digital circuit, an image is formed by an imaging circuit such as a DSP. The biggest difference between fast scan and slow scan lies in the difference in speed and circuit system
Fast scan exports the frequency of electron very fast, in order to be able to reach the refresh rate of the video level, but this will cause the electron to lose, the noise increases, the photoelectron electronic empty is not thorough; And the slow scan is opposite, its circuit design emphasizes on the electron accumulation of the electron In terms of protection, the frequency of derivation is not high, but the loss and loss of electrons during the outgoing process are guaranteed to be extremely small. Its analog-to-digital converter has a high dynamic range and sensitivity, which ensures that the signal conversion process is not distorted, and at the same time, in order to reduce thermal effects. The noise generated is generally cooled using the Cooling system.
After reading the above explanation, we can know why the professional-grade scientific research cameras are so expensive, starting from the material and area of ​​the CCD photosensitive layer, to the accumulation of photoelectron electrons, to the electronic derivation circuit, transmission circuit, analog-to-digital conversion circuit, and images. Display circuits, Cooling circuits, each step of the professional-level research camera technology and civilian-level different, the cost is in the dozens of times to several hundred times. There is only one purpose, professional camera can collect all the light signals as completely as possible. In general, civilian cameras or digital cameras can only reflect light signals below 50%.
Evaluation of the basic indicators of the CCD include signal-to-noise ratio, cooling temperature, pixel values, etc. 3.1 Signal-to-noise ratio (SNR) Signal-to-noise ratio truly reflects the camera’s detection capability. All CCD camera manufacturers try to maximize the signal (which can reach the number of full wells) to minimize the noise while improving the performance of the camera. SNR = Full Well Electronics / Noise Electronics = Dynamic Range = Maximum Gray Scale = 2 Bits 3.2 Cooling Temperature In the same CCD with full well electronics, lowering the CCD noise can improve the CCD monitoring capability. The thermal or dark current is a noise to the CCD, and the noise can be basically eliminated by the deep-cooled Peltier in the Cool CCD. In exposure for more than 5-10 seconds, the CCD chip will heat up, there is no chip for the cooling device, “hot” or white pixels will cover the image, the image can be seen everywhere snow. The camera at -20°C can capture images for up to 5 minutes and the camera at -40°C can take over 1 hour. CCD structure design, digital methods, etc. will affect the generation of noise. By improving the structure and optimizing methods, noise generation can also be reduced
3.3 Pixel Area This indicator is an important indicator in the chip. The larger the pixel area, the more sensitive to light. Because there are more electrons in the pixel area, more signals can be generated. Larger pixels increase sensitivity and smaller pixels increase resolution. To increase the image quality, it is necessary to increase the pixels of the CCD. Therefore, in the case of a certain CCD size, adding pixels means that the photodiodes in the pixels are reduced. We know that the smaller the area of ​​a unit pixel, the lower the sensitometric performance, the lower the signal-to-noise ratio, and the narrower the dynamic range, so this method cannot increase the resolution without limit, so if we do not increase the CCD area and blindly increase Resolution will only cause deterioration of image quality. However, if you want to maintain the existing image quality while increasing the CCD pixels, you must increase the total area of ​​the CCD on the basis of at least keeping the area of ​​the unit pixels not decreasing. At present, larger CCDs are difficult to process and manufacture, and the yield is relatively low. Therefore, the cost has not been reduced. This contradiction is difficult to overcome for the CCD.
CMOS (Complementary Metal Oxide Semiconductor) is a “complementary metal oxide semiconductor.” It is an important chip in the computer system, and it saves a lot of data needed for system guidance. The CMOS sensor is convenient for large-scale production, and it is fast and has a low cost. It is one of the key development directions of digital cameras. Third, several important parameters 1. White Balance Under different light sources, the color of the photograph will be color cast due to the difference in color temperature. For example, when the color temperature is low, the red and yellow light contents in the light are high, the color of the photographed photograph will be reddish, and the yellow color will be high. When the color document is high, the blue and green colors in the light will be more, and the photograph will be blueish and greenish. At this time, it needs to be corrected by the white balance function. The principle is to control the brightness of the red, green and blue ternary colors in the light so that the maximum light position in the image can reach pure white, which can make other colors accurate.
3. The method of increasing the pixel size of an image without increasing pixels. This is a term used in computer graphics to describe the number of colors that a generated image can contain. “8-bit depth” means that the image contains only 256 colors. Today’s digital cameras have a color depth of 8 bits for each color. Since the color of each pixel is a mixture of red, green, and blue colors, the image contains 256 × 256 × 256 colors, a total of 167 million, which is the so-called 24-bit color. 4. TWAIN This is a very common word in digital photography. TWAIN refers to a special kind of software that allows other TWAIN-compliant software to share image resources. For example, PaintShopPro, which is a good image-processing shareware, works with TWAIN devices. So you can Us e the digital camera directly in PaintShopPro. TWAIN devices include scanners, fax machines, and of course, digital cameras

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