Posts Tagged ‘ charged coupled device’



Office Security Cameras

Written By:
Thursday, April 12th, 2012

Office Security CamerasDo you need an office security camera? These cameras can greatly enhance the security of any office. Do you fear who may be entering the office complex without your permission? Do you need to restrict the access of certain rooms within the building? Do you need to know when deliveries are made to the business even when you are not there? If you answered yes to any of these questions, then you may have questions about what type of security camera is the right one for your office.
Office Box Security Cameras

The most popular office security camera is the box security cameras. These box security cameras are inexpensive to purchase, inexpensive to install and relatively easy to operate. The office owner will need to determine the correct lens for each camera. For example, these cameras can be installed with infrared lenses to take photos in low light conditions. These cameras are limited in that they will only take photos in one direction. It may take several cameras to cover an entire building or even just one room. The box office security camera can be connected to a computer for monitoring. The box security camera is not waterproof, but can be installed inside waterproof housing. It is important to look for a box camera with large frames per second rate. Currently the largest frame per second rate is 30. A great additional factor is to buy a box security camera with a built-in SD card. This will provide backup should your network fail. The office owner will also need to consider the available bandwidth required by more than one box camera. Look for a box security camera with 5 megapixels to deliver the most clarity. The higher the megapixels the lower the frame per second rate will be. Box security cameras are among the largest cameras on the market today. Their size may deter some thieves.

Office Dome Security Cameras

Another popular option for office security cameras are dome cameras. These dome cameras are available for purchase in various colors to match the décor of the office. Office owners who need cameras outside can purchase waterproof models. Office dome cameras are available with interchangeable lenses so that they can be used in different circumstances. Like the box camera, when purchasing an office security dome camera consider buying a camera with a SD card. This will provide additional evidence should the authorities request it. Also look for a high frame per second rate and a camera with at least 5 megapixels. Make sure that you have the funds available for the higher amount of bandwidth required by multiple cameras. Since these cameras are circles, it is impossible for those in an area protected by a dome camera to tell exactly where the photos are being taken. The most popular of these dome cameras feature a frame per second rate near 30. Dome cameras often look better than box cameras in high end offices.

Office Bullet Cameras

Some offices prefer the bullet cameras. These cameras are available in large or small sizes. Since these cameras are waterproof, they make an outstanding option if installed to protect the outside of an office building. Like dome cameras, these cameras feature interchangeable lenses. Make sure to purchase the right lens to use in the particular circumstances. For example, if you have a room that is kept dark most of the time, the right lens would be an infrared lens since it can operate with limited light. On the other hand, if you will be installing the office bullet camera in bright sunshine, you may want to consider a lens with a special coating that helps to take great photos in these conditions. Understanding the differences in lenses will assure your maximum satisfaction.

Office Spy Cameras

Some offices prefer to use spy cameras. These spy cameras can be placed throughout the office and are disguised to look like normal office items. One popular option for many offices is clock spy cameras. Make sure that these cameras operate silently. Spy camera pens are a great option for employees that carry supplies outside the office are spy pens. It is vital to buy a spy camera that will work with the available light. Many thieves are very aware of the sound these cameras make so make sure that you buy a camera that operates silently.

Office PTZ Cameras

The last option is the most popular with most office owners. The pan, tilt and zoom spy camera provides many alternatives to the office Office Security Camerasowner looking for the most for their money. These cameras can be operated remotely to take the best photos. For example, the camera can be placed outside a door and operated remotely to pan an entire hallway. These cameras can also be tilted to see items at different heights. They can be tilted up to clearly see a person’s face. They can also be tilted down to see a package that has been left in front of a door. These cameras can also be used to zoom into a situation to see the details more clearly. However, office owners need to realize that the pan, tilt and zoom camera requires 24 hour a day, seven days a week to be the most effective. These cameras require the most elaborate wiring of any security camera. They also require the most power.

Major Factors to be Considered

Software

When looking to purchase an office security camera, there are several factors that apply to all security cameras. Remember that each camera will require software to operate. The software needs to be integrated with other software already in use in the office. Some cameras operate on Mac systems, while others do not. Be careful and buy a camera that will operate on the current system.

Power

Security cameras require electricity to operate. Think about how you will integrate the security system into the existing power grid. It may be necessary to hire an electrician to revamp the electrical system with new plugs. Make sure to meet city and state codes when making these changes.

Color

Cameras are available in different colors. Buy a color that will match the décor of your office. Also the power cords and cables come in different colors. Again, purchase a system that will integrate with your existing décor. Some office owners prefer to make the cameras stand out as a deterrent to crime. This is a personal decision that must be weighed carefully.

Monitoring

Security cameras are only as good as the people monitoring them. Make sure that you assign specific people the responsibility to monitor the cameras. Develop a contract that spells out exactly what you expect of your monitoring people to avoid any misunderstandings. Some offices prefer to hire a professional company to monitor the cameras.

Lenses

Security cameras will only catch the crime if the action is caught on the lens. Therefore, it is important to consider what type of camera and lens is right in each circumstance. Most security cameras will only cover 25 percent of a room. Those that cover a whole room often have very distorted photos with minimal detail. Different cameras require different lenses. Make sure to buy a lens that is ideal for the circumstances you intend to install the office security camera in.

Frame Rate

Security cameras come with different frame rates. Buying the largest frame rate available enables a great fluid picture that is easy to watch. Buy a camera that allows the user to install an SD card. It is a great backup should the electricity fail. Consider the available frame rate for the entire system. It may be necessary to install new computers to monitor your office security cameras successfully.

Megapixels

The larger the megapixels available are on the office security camera, the larger the photo can be enlarged. This will allow more details to be seen. Lower megapixels cameras often have trouble, known as noise, when the photo is enlarged. The ability to enlarge the photo will assist the authorities and you in seeing details that might otherwise be missed.

Television Line

Analog office security cameras will have a television line number. This number needs to be near 700. The larger the number the crisper the photo will be. Crisp photos enable the viewer to see the details clearly. A lower number may make it impossible to tell who is standing at the door or details about the package that has just been left.

The security of an office often depends on the use of great security cameras. They are an important part of any office security system. First, choose the right type of security camera for your office by choosing the right television line, megapixels and frame rate. The safety of all people who work in the office may depend on your security system. The property may depend on the quality of your security cameras. Make an informed decision now before it is too late. You may never have another chance.

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Infrared Camera System

Written By:
Thursday, September 15th, 2011

If you need security and surveillance coverage in poorly lit or no light areas, you should try using an infrared camera system.  In the following article we’ll talk about how these cameras work and what to look (out) for when purchasing a system.

Under normal daylight conditions a digital video security camera utilizes the light waves that are reflected from the objects in its field of vision.  It does this by using a lens to focus the entire image onto a sensor chip that is usually 1/4 or 1/3 of an inch square.  The sensor chips work by converting the light energy into a small electrical impulse which can be measured and therefore ultimately used to create a digital video image.

Although both chips work a little differently, each produces the same result.  The type of sensor used is usually the choice of the manufacturer.  They are normally referred to by an acronym because the names are relatively long.

One sensor is called a Charged Coupled Device or CCD and the other is called a Complementary Metal Oxide Semiconductor or CMOS.  These sensors have a lot in common even though they function differently.  However one of their common traits is that both the CCD and the CMOS inherently sense infrared waves in the near infrared spectrum.  Because of this, a regular digital video camera can also be used as an infrared camera or collectively as an infrared camera system.

Actually, in some systems, a filter is used during the daytime to prevent infrared radiation from reaching the sensor.  Sometimes extra infrared in addition to visible light exposure may result in a poor daytime image without a filter.

A typical infrared camera system also produces images that are either black and white or monochromatic.  Even though these images may not be “in color” they can still maintain the crisp, clear, high-resolution that is associated with the daytime use of the cameras.

An infrared camera system does not produce color images when working in infrared mode because it senses the near infrared spectrum.  The near infrared spectrum does not include visible light so only a monochromatic image, not a color image, is seen.  Some may consider this a disadvantage of infrared camera systems, but to many the other special features of an infrared camera far out weigh this particular feature.

One advantage of using infrared radiation in darkness is that the human eye can not see the infrared radiation (light)–but the camera can.  This feature can put the camera in a stealth mode making it very difficult to see at night, yet its picture is just as clear and detailed as if it were daylight conditions.

The near infrared light spectrum is at the lower end of the infrared scale so it generally requires artificial near infrared light to do its job.  But where does the infrared camera system get its infrared light?

Basically, of the three types of cameras box, bullet, and dome, the bullet and dome cameras may furnish their own light.  This is done by placing InfraRed Light Emitting Diodes or IR LEDs in an array around the camera lens.  Although humans can’t see this special light source, it provides enough light as to make it look like a floodlight was used to capture the video image.

Generally, the more IR LEDs that are used the longer the range of the infrared video image from the camera.  One thing to look (out) for is the IR range.  If you are interested in purchasing an infrared camera system, you need to measure the distance you want the camera to cover under IR mode.  Most cameras state this on their package in their specifications for example, “IR Range 60 feet indoors 50 feet outdoors.”

If the infrared camera system does not achieve the distance you may require, you can either purchase a camera with a longer range or purchase an “Illuminator.”  An illuminator is a series of IR LEDs that at are strong enough to shed infrared “light” up to 300 feet or more.  Illuminators often mount like cameras and use the same power requirements of a typical camera.  Once again, check the specifications of illuminator to make sure the range extension it provides meets your requirements.

If you have any additional questions about an infrared camera system, please contact one of Security Camera King’s security experts by Live Chat or telephone.  We love to help!

 

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Dome Security Camera

Written By:
Friday, April 1st, 2011

The dome security camera is one of the most popular types of digital video security camera in use today.  Thanks to modern technological advances a lot of electronic power can be packaged inside a small 3.5 inch diameter dome camera.  Not only are they small and powerful, but the average dome security camera is light weight as well (in most cases weighing just under one pound), which makes it easy to mount just about anywhere.

Today, there are three standard types of digital video camera based on shape; the box type, bullet type, and dome security camera.  How, what, and where the camera is used usually dictates the type, although user preference is also a factor.

Dome cameras originated from their older analog ancestors.  These cameras were often big and bulky and required a great deal more depth than today’s dome security camera.  Often, the older cameras were actually box cameras placed behind a wall or ceiling with the body of the camera extending into the wall space ith just the lens extending through a pre-cut opening.   A glass dome was then fixed over the lens to make it more aesthetically pleasing.  Blackened glass or two-way mirror glass was often used to conceal the lens, so that potential shoplifters, intruders, etc. would not know in what direction the lens was aimed.

Current dome security cameras are nothing like what is described in the previous paragraph.  Considering that the main components of a digital video camera are the lens, the sensor chip, and the Integrated Circuit (IC) electronics the largest part of the camera is often the lens which on the average is about 3.6mm in diameter.

A digital video dome security camera is a compact, highly sophisticated electronic piece of equipment.   The sole purpose of the camera is to transfer light images into electronic images that can be seen on an electronic display device such as a monitor.

It does this by first using a lens to focus the field of view onto a tiny sensor chip.  These chips range from 1/3 inch to about 1/2 inch square.  One of two different sensor ships is used.  Although the chips go about the process differently, both yield the same result; transferring light into electronic impulses that can be measured (and therefore used to create an electronic image).

The sensor chips are either a Charged Coupled Device or CCD or a Complementary Metal Oxide Semiconductor or CMOS.  After the sensor chip converts the light image into an electronic impulse, the IC chips take over processing and digitizing the electronic information and passing it along to the Digital Video Recorder or DVR.

There are several types of dome security cameras based on how they function or where they are intended to be used.  Dome security cameras can be classified as indoor, outdoor, or indoor/outdoor types although most outdoor types today are the combination indoor/outdoor.  Indoor dome cameras are intended to be used inside, under protective cover from the weather and other elements.

Outdoor dome security cameras are protected by an outer shell or case that prevents water, snow, hail, or other damage to the camera itself.   These cameras are often rated according to the International Electrotechnical Commission’s (IEC’s) Ingress Protection or IP standard.   An IP rating of IP55 or higher is usually considered good.

Dome security cameras are usually flush mounted on a ceiling or wall, but may be mounted on special mounts that can range from peduncle type to horizontal extensions.  They require very little surface area for mounting, and can usually be mounted easily using from two to four screws.  The video transmission cable and the power supply cable usually attach from the underside of the mount or there are extensions exiting from under the mount such that the wires remain hidden and protected by the structure the camera is mounted on.

Dome security cameras may also work in InfraRed (IR) modes and the IR Light Emitting Diodes or LEDs are normally clustered right around the camera lens.   This provides directed IR illumination in the exact field of vision of the camera lens.

Security Camera King offers a wide selection of indoor and outdoor (as well as indoor/outdoor) dome security cameras.  Our cameras are of the highest quality and offer the best performance at the most economical price in the industry.

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Wireless Wall Clock Camera

Written By:
Tuesday, February 15th, 2011

Sometimes it’s necessary to keep a watchful eye covertly, and a wireless wall clock camera is just the device for the job. Security Camera King offers several different types of hidden cameras, including wireless wall clock cameras. These cameras are built in such a way that detection of surveillance is almost impossible.

Our security experts are often asked how these cameras actually work and how they can be concealed in an object like a clock. In the following article we’ll talk about how a wireless wall clock camera works an mention the types available for purchase through Security Camera King.

The key factor behind hidden or disguised digital video security cameras is advanced technology. In the no to distant past, security and surveillance cameras were analog based. Since they are now digital, that has allowed the security camera industry to share the benefits of technological advances found in the personal computer and electronic industries. This in turn has yielded incredibly small, high quality cameras that can capture video images in a variety of different conditions.

Creating a digital video image using a wireless wall clock camera begins with the camera’s lens. Objects have a natural tendency to reflect light. The light that is reflected is gathered by the lens and focused on an electronic sensor. Many hidden cameras use a highly accurate 3.7 mm wide angle lens. To get an appreciation for the size of this lens, hold two nickels together. The thickness of two stacked nickels is a little greater than the entire size of a 3.7 mm lens. The wide angle feature allows this small lens to have a proportionately larger field of view.

The lens focuses the light image on a small electronic sensor. One of two different sensors is used. A Charged Coupled Device or CCD or a Complementary Metal Oxide Semiconductor or CMOS converts the light energy into electrical impulses. The CCD and CMOS go about the process a little differently, but both yield the same end result; electrical impulses that can be measured and used to create a digital video image.

As a side note, CCDs have historically produced a higher quality image with a greater demand for electrical power while CMOSs have produced a slightly lesser quality image with a lesser demand for power. However, as technology advances, both CCDs and CMOSs are approaching an equal state of quality and power demand.

All of Security Camera King’s wireless wall clock cameras use CCDs. One would think that the electronic sensor would need to be rather large, especially when using a wide angle lens. However, our wireless wall clock cameras use a very small 1/4 or 1/3 inch CCD. Using a 3.7 mm lens and such a small CCD, it should become obvious how easy it is to disguise the camera with the clock face.

After the light images are created into measurable electrical impulses by the CCD, the camera then converts this analog data to binary or digital form by using an analog-to-digital converter. The analog-to-digital converter resides in a very small Integrated Circuit or IC chip that takes up very little space.

Now the video data is ready for transmitting. Once again a relatively small IC chip comprises the transmitter. The circuit converts the digital data into radio waves that can be sent by the transmitter to a corresponding wireless receiver.

Our wireless wall clock cameras use 2.4 GHz radio technology; the same technology used by many land-line based wireless phones. This technology offers a strong, clear signal with very little interference.

Normally the receiver is located near the Digital Video Recorder or DVR unit and is connected to it by a cable. Once the wireless wall clock camera video signal reaches the receiver, it is transferred to the DVR where it can be displayed on a monitor and viewed live and/or stored on the DVR’s hard disk drive for archiving or later use.

Security Camera King offers four different wireless wall clock cameras. We offer a “standard” looking wall clock that looks like any plain circular wall clock found in an office or home. We also offer a more sophisticated looking clock camera with humidity and temperature indicators. Each of the two designs offers either a black and white video image or a color video image. The black and white video images models will produce a high quality image in very low light conditions (0.003 lux for example). Check our “Wireless Hidden Cameras” web page.

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CCTV Digital Camera

Written By:
Monday, January 31st, 2011

If the Digital Video Recorder or DVR is the heart of a digital video security system, then the CCTV digital camera must be the eyes. The cameras used today are top-notch technological wonders that provide high quality color video images. The have a vast selection of optional features that make their use extremely flexible and easy to use under almost any application.

A Closed Circuit Television or CCTV digital camera are the eyes of a digital security system because they are the devices that “see and capture” the action. There are many types of CCTV digital cameras available but they all “see and capture” using one of two similar methods. To describe how a CCTV digital camera works without getting too technical, we’ll tell you about their sensors and other parts of the cameras and how they integrate to get the job done.

Let’s divide the average CCTV digital camera into three parts: 1) The lens; 2) The sensor; and, 3) The analog-to-digital converter and all other supporting electronics.

The Lens
There are essentially two different type of lenses used in CCTV digital cameras. The first we’ll mention is the “fixed lens.” The fixed lens is so named because the focal length of the lens is stationary or fixed. This indicated that the lens as a definite range of focus as well as a fixed field of view. These lenses are excellent for cameras that are used in applications where the distance between the subject or object being recorded and the camera is usually constant. Examples of these uses include retail store shoplifting coverage, equipment monitoring, gate entrance monitoring, room surveillance, etc.

The varifocal lenses have a variable focal length. This means that these lenses can zoom in or zoom out on subjects or objects and be manually focused. This lens is a bit more expensive than a fixed lens. Applications for this lens would include uses where the camera position is changed on a regular basis or the field of view is changed often.

Either type of lens has basically the same function: Manipulate the light emitted by the image in the camera’s field of vision, so that it presents an incredibly high quality image that is focused on the cameras incredibly small sensor.

The Sensor
There are also two different type of lenses used in CCTV digital cameras. They take the focused light image and convert it into tiny electrical charges that can be used to create a digital video file or image. The two sensors used are the Charged Coupled Device or CCD and the Complimentary Metal Oxide Semiconductor or CMOS. At one time the CCD produced a high quality image than the CMOS at a slightly higher cost in price for the sensor. The CMOS on the other hand, used far less electricity to complete the task of creating the electronic video image. As time and technology progresses, the newer CCDs use less electricity and the newer CMOSs produce a higher quality image so that they are relatively similar in power usage, quality and cost.

Whether it’s a CCD or a CMOS, the sensor, with the help of supporting electronic circuitry, pass the image which at this point is in analog format, to the analog-to-digital converter.

The Analog-to-Digital Converter
CCTV digital cameras produce their finished product, the video image, in a binary or digital format. Since the equipment used along the way to produce the image does so basically using analog methods, the analog-to-digital converter is necessary to transform the analog signal into digital data. This converter is usually a relatively small Integrated Circuit (IC) chip that is designed specifically for this purpose. It must be very powerful and extremely fast in order to convert the signal for use in real-time (live).

When the signal leaves the analog-to-digital converter, it is now in digital form and ready to be sent to the DVR and/or monitor. This is done by one of two different methods as well. Either the signal is carried to the DVR using a video transmission cable (which in most cases is an RG-59 coaxial cable), or wirelessly converting the signal into a radio signal that can be transmitted for the camera to a corresponding receiver.

This should give you some working knowledge on how a CCTV digital camera works. If you need additional information or considering a purchase, please contact one of our security experts today using on-line “Live Chat” or by toll-free telephone at 866-573-8878.

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