CCTV CAMERA LENS CALCULATION METHODS

CCTV LENS SELECTION METHODS

Security cameras utilize two basic lens types based on focusing parameters. These are called fixed lenses and varifocal lenses. Fixed lenses have a “fixed” focal length while varifocal lenses have a focal length that can vary. A more familiar term used for electric powered varifocal lenses is a “Zoom” lens; we will “focus” (pun intended) on the fixed type in the following article.

In addition to the focusing characteristics of the lens, light requirements must also be considered. The light that is allowed to penetrate through the lens and strike the electronic sensor chip is normally controlled by a mechanical device known as an “iris.” The iris may be fixed, manual, or automatic. This refers to how the iris makes the light opening, called the aperture, smaller or larger. The aperture is equivalent to the human eyeball’s pupil. In very low light settings the aperture needs to be open wide to allow enough light to strike the sensor chip. However, in bright light conditions, the aperture is very small to prevent too much light from flooding the sensor chip.

If a security camera is used indoors in a setting that has a constant intensity of adequate light (i.e., a store, a warehouse, or a well lit room), then a “Fixed Iris Lens” should perform adequately to serve your needs.

In settings where the light conditions can vary from dark to bright (i.e., outside or a camera aimed at an outside window) an “Auto Iris Lens” will be needed to compensate and adjust for the varying light levels.

Finally, in light conditions that are constant for long periods of time but change from dark to light or light to dark, a “Manual Iris Lens” can be used. These lenses’ apertures are changed by hand to provide the optimum light exposure.

Lenses are created using a combination of Fixed and Varifocal parameters with Fixed Iris, Auto Iris, or Manual Iris apertures. Keeping the aperture requirements in mind let’s return to the issue of focal length. Most security camera lenses’ focal lengths vary from 3.6 mm to 16 mm for fixed focal length lenses, to well over 70mm for zoom lenses. A short focal length will yield a wide angle of view and a long focal length will yield a narrow angle of view

The actual mathematical formula used to calculate the width and height of the area covered is Width = Camera Horizontal Format X Distance/Focal length and Height = Camera Vertical Format X Distance/Focal length

In this formula, values for the Camera’s Horizontal and Vertical Format are the size of the CCD or CMOS chip expressed in MILLIMETERS, not inches, with the pictures aspect ratio of 4:3. For example, for a 1/3 inch CMOS chip the vertical size of the chip in mm is 3.7 mm and the horizontal size is 4.9 mm. Use the vertical format value of 3.7 mm to calculate height and the horizontal format value of 4.9 mm to calculate width. Here is a list of some common sensor sizes and their corresponding camera vertical/horizontal format values:

• 1/3 inch 4.9 mm horizontal 3.7 mm vertical
• ½ inch 6.4 mm horizontal 4.8 mm vertical
• 2/3 inch 8.8 mm horizontal 6.6 mm vertical
• 1 inch 12.7 mm horizontal 9.6 mm vertical

For example, 2/3 inch CCD using a 25 mm lens that is 30 feet from the area being monitored can be calculated the following way:

Horizontal: (8.8 x 30)/25 = 264/25 = 10.56 feet horizontal
Vertical: (6.6 x 30)/25 = 198/25 = 7.92 feet vertical

To determine the lens requirement, just switch around the values in the formula to solve for focal length so Focal Length = Vertical Format x Distance/Height of Picture. For example, the focal lens requirement for a camera using a ½ inch CCD that is 20 feet from the area being monitored covering a height of 12 feet can be calculated as:

Focal length = (4.8 x 20)/12 = 96/12 = 8 mm

To sum it all up, let’s say you need a camera to monitor an outdoor area, all day and evening long. The camera has a ½ inch CCD chip, the area being monitored is 20 feet from the camera and it needs to cover an area 12 feet high. Your camera lens requirements would most likely be a fixed focal lens with either a manual or automatic iris, and a lens with a focal length of 8mm.

- See more at: http://www.securitycameraking.com/securityinfo/how-to-calculate-lens-requirements/#sthash.tkHw5oRb.dpuf

Smart Home

Intersec 2017 presents Smart Home Concept that would make security at fingertips absolutely affordable! 

Intersec 2017 will for the second time present the concept of Smart & Safe Home Automation through its international platform. The technology has seen rampant growth and development. The market in the GCC has not only begun to realize the benefits in terms of comfort, security, and luxury. But also in terms of energy saving and increasing property value, thus all these realizations will continue to lead to a booming market in the GCC. Emphasis will be on various technologies such as KNX, X10, Zigbee, En-Ocean, Bluetooth and Z-wave.

Just as everyone wants a Smart Phone, the future demands not just homes but Smart Home, not just safe and secure but smart on energy, entertainment and accessibility. With new residential and commercial properties aiming at optimizing the energy, safe and secure environment, centralized control for temperature, lighting and entertainment, intelligent system integration is the way forward.

The growth of the smart homes market in the coming years is expected to be high with the market size estimated to reach $58.68 billion by 2020, at an estimated CAGR of 17% from 2015 to 2020, according to Markets & Markets Report.

Visit the special Smart Home pavilion in Hall 1 and discover companies like VIdex, AVS, Siamaran, Door Bird, Olympia, Slinex, and PSCOM. Discover latest trends and technology to design the future! 

•   Home Security

•   Auto Controlling & Integration

•   Physical Security Systems:

•   Video Surveillance System

•   Access Control System

•   Alarming System

•   Fire and Safety System

•   Home Energy Management Systems:

•   Lighting Control System

Network POE INDOOR / OUT DOOR SOUND Cabinet Speaker

Audio made smart and easy AXIS C1004-E is an all-in-one speaker system connected with a single network cable. It delivers out-of-the-boxready high-quality sound without any need for fine-tuning. Background music can be played via the preinstalled AXIS Audio Player application. You can create and schedule your own playlists from an onboard SD card or from audio streaming services. AXIS C1004-E is also perfect for voice announcements (scheduled or live calls). The speakers can be zoned together thanks to built-in audio synchronization technology. > Easy music streaming > Voice announcements > All-in-one speaker system > Quick installation with just one network cable (PoE) > Future-proof with openness and integration

BEST SMALL HOME AUTOMATION

What is Pert?Pert is the new revolutionary innovation of the smart world, providing intelligent technology for all your home automation needs. Pert home automation systems are designed to seamlessly adapt to your living and working environment, allowing you to monitor and manage the same from the comfort of your phone, in a comfortable and convenient fashion. Pert’s wide range of smart products like plugs, sensors, cameras and switches allows you to automate your home/office, effortlessly and efficiently.

What can a smart home do? A smart home enhances safety and security Security is one of the core features every home owner looks for, which can be enhanced with the help of Pert home automation systems. For example, Pert’s smart camera (launching soon), works wirelessly by streaming live video, helping you keep an eye on your home while you are away. A smart home helps you save money A smart home helps you save money A fully integrated home automation system uses information from all connected devices and switches in your home, and sends you alerts when excess energy is being used or an appliance is not performing efficiently. Using this vital information, you can monitor the energy usage of your home, and make necessary enhancements, thus saving you energy and money in the long run. A smart home helps you saves time With devices like smart plugs, sensors and switches, a smart home gives you numerous ways to save time, when you are rushing out to work every morning, or simply want to carry out everyday activities efficiently. From your smart device, you can schedule switches or appliances to turn on or off, and program them to do so every day at a specific time.

Why you should choose Pert MADE IN INDIA Pert products are made for the Indian market from locally sourced materials. Affordable Pert products are completely affordable and reliable, since they are locally produced. IN-HOUSE R&D Our in-house R&D team works tirelessly to bring to you the best products for your home.

PANASONIC INTERCOM SYSTEM DUBAI

Panasonic Intercom System Dubai brings upgraded features and ease of operation that will enhance security for your family. Panasonic Intercom System Dubai can be easily installed and conveniently expanded. The Panasonic Intercom System Dubai includes a monitor for seeing and hearing activity at the front door, a convenient wireless monitor that can be carried about, an IPS LCD that can be easily viewed at angles and from below, a beautiful 5.2 inch color monitor, recording support that can safely store a maximum of 400 images, and whole lot more. And, Panasonic Intercom System Dubai comes with Transfer Calling that allows use as an ordinary phone plus a host of features for enhancing family communications. Also available is a 3.5 inch LCD Model that is great for enhancing family security and can be easily installed anywhere in the home as demanded by your family’s situation. Panasonic Intercom System Dubai is concerned about the safety of your family.

LARGE SYSTEM EXPAND ABILITY TO MEET CUSTOMER NEEDS

The Panasonic Intercom System Dubai offers large system expand ability via combination with optional products, not only for detached houses but also apartment buildings, to meet customer needs for safety and convenience.

1. Panasonic Intercom System -VL-SW250BX
2. Panasonic Intercom System -VL-SV30BX
3. Panasonic Intercom System -Wireless Video Intercom VL-SW251
4. Panasonic Intercom System -Wireless Video Intercom VL-SWD501
5. Panasonic Intercom System -Wireless Door Camera VL-SDM200
6. Panasonic Intercom System -Wired Video Intercom VL-SF70
7. Panasonic Intercomm System -Wireless Door Camera VL-DM200
8. Panasonic Intercom System -Wireless Door Camera VL-SDM100

BEST HOME SECURITY WITH TNY

Burglary and fire alarm systems are one of the most effective lines of digital defenses available today. Just like any other system, over time, security systems has evolved into a sophisticated network of various devices such as motion detectors, door and window contacts, glass break sensors making an unnoticed intrusion practically impossible. The main advantage of such systems is the ability to contact required authorities without any input from the user. Meaning that if you are away from home or asleep and the perimeter gets broken into police will be on their way to your premises within seconds. In some cases these systems are even required by insurance agencies or can drive insurance costs for your venue or home way down. We know these systems well and guarantee a complete satisfaction for you and your insurance agent and complete dissatisfaction for your intruder.

Residential

Most home security systems feature an elegant design packed with numerous additional features that display various information on the screen of the keypad panel. Such systems are usually wireless and can display your current home security state, weather, traffic, local security cameras, control lighting and garage doors. Provide an easy to read user interface and easily setup to be used with your smartphone device or a tablet from anywhere in the world. These features make these systems a high competitor for a full blown home automation system. Some of these security systems we provide free of charge to you as long as you sign up for a monitoring contract. Please check the link bellow for some of our offers.

Commercial

Commercial security systems are usually installed in warehouses, pubic spaces such as libraries and gyms, office spaces, public garages, restaurants and so on and so forth. These systems feature a more rugged keypad that displays only time/date and a current arming state, all zones in most cases are hardwired and the systems is expandable to hundreds of zones. They have 2 or more means of transmitting the signal to central station and have larger back up batteries then the residential system. Devices that are attached to commercial systems are also of a higher performance then the residential ones – motion detectors range to about 100 feet, contacts are more durable, beam sensors are in demand. Please follow a link bellow to see what we can offer.

CCTV ANPR Solution

 Automatic number plate recognition (ANPR) is a mass surveillance method that uses optical character recognition on images to read vehicle registration plates. ANPR  camera Dubai. They can use existing closed-circuit television or road-rule enforcement cameras, or ones specifically designed for the task. They are used by various police forces and as a method of electronic toll collection on pay-per-use roads and cataloging the movements of traffic or individuals.ANPR  camera Dubai.

ANPR can be used to store the images captured by the cameras as well as the text from the license plate, with some configurable to store a photograph of the driver. Systems commonly use infrared lighting to allow the camera to take the picture at any time of the day. ANPR technology tends to be region-specific, owing to plate variation from place to place. ANPR  camera Dubai.

ANPR has become the need of the hour keeping in view the increasing cases of traffic rules violation and crime. An ANPR camera keeps an eye on the vehicles plying around a region. APNR cameras, an ideal solution of mass surveillance, capture the image of vehicle registration plates which can be stored in the inventory list of commuters. ANPR  camera Dubai.

Dos Technologies Dubai  offer a wide range of cameras that provide the best quality images. We incorporate latest technology to make the product more useful to its users and capable of reading number plates of almost every country. ANPR  camera Dubai. With years of experience in designing and supplying super quality camera worldwide, we work closely with the customers to understand their specific need and customize cameras to as per their needs.