A hot new trend in video surveillance

CCTV Handbook 2011 Surveillance

Thermal cameras advance surveillance capabilities in all light conditions.

All network cameras have a basic physical limitation: they need light to work. At least up to now.

Sure, some network cameras have night and day functionality that allows them to operate in very poor lighting conditions, down to fractions of a lux. And of course, if natural light is not available it can be substituted by electrical light, either visible to the human eye or infrared. But in some instances these solutions have serious drawbacks – they can be expensive and inefficient, and illumination creates shadows where an intruder can hide, to mention a few.

The thermal network camera is a perfect complement to any professional IP surveillance system; it can be seamlessly combined with existing equipment, and it is possible to secure an area or a perimeter that lies in complete darkness.

Thermal technology enters the mainstream

Images, as they are perceived by the human eye, can be described as light reflected by different objects. No light means no reflection and thus the eye is blind under such circumstances. Thermal images on the other hand, are not dependent on visible light. Instead, images are created by operating in the infrared spectrum. It works perfectly well even in total darkness since the ambient light level does not matter.

What makes this possible is the fact that all objects – organic or inorganic – emit a certain amount of infrared radiation as a function of their temperature. Humans cannot see this, but we can sense it, for example, when we approach a campfire or enter a sauna. The greater the temperature difference in a scene, the clearer the thermal images will be.

Thermal imaging is nothing new. But until recently, costs have usually been prohibitive, making practical applications outside the military rare. This has started to change as new sensors, new materials and other improvements are driving the volumes and making prices more reasonable. Thermal cameras can now be found in various lines of business such as the aircraft industry, shipping industry, and security and surveillance. The technology is also used in public services like fire fighting and law enforcement. Lately it has even appeared in consumer products, albeit often expensive ones like luxury cars.

Challenges posed by difficult conditions…

Thermal cameras do not only perform well in total darkness, they also perform well under difficult climatic circumstances such as haze, dust, rain, snow and smoke. All the same, there are physical limitations to the performance of thermal cameras.

Water droplets or small dust particles in the air will naturally hinder the transmittance of thermal radiation from a single object, making it harder to detect from a great distance. Consequently, haze, snow and rain will hamper camera performance. Water limits thermal radiation and the moisture in the air evens out temperature differences between different objects in the picture. Therefore, a thermal camera will produce better and clearer images during winter with clear skies and good weather conditions than under comparable atmospheric conditions during summer when humidity is usually higher.

But even with these limitations considered, when it comes to detection, thermal cameras are superior to conventional cameras under a wide range of difficult weather conditions.

…And legal issues

A number of products and technologies that can be used both for military purposes and in commercial applications are called dual-use goods. Exports of such items are regulated in the international Wassenaar Arrangement from 1996, which aims to promote transparency and greater responsibility in transfers of conventional arms as well as dual-use goods and technologies.

Not surprisingly, thermal imaging technologies, which often have been originally developed for military use, fall under this category. Thermal sensors may therefore only be freely exported if the maximum frame rate is 9 fps or below. Most cameras for surveillance purposes fall under this category. Cameras with a maximum of 111 000 pixels and a frame rate of up to 60 fps can be sold in the US, the EU, and a handful of other friendly nations, on the condition that the buyer is registered and can be traced.

Regardless of these restrictions, resolutions are generally much lower for thermal cameras than for conventional network cameras. This is primarily due to the more expensive sensor technology involved in thermal imaging. Lower frame rate is less of a problem in most surveillance applications since thermal cameras are first and foremost used for detection and not for identification.

Real world benefits

With thermal imaging becoming relatively cheaper and an integral part of IP surveillance systems, a whole range of uses becomes both possible and economically viable. Thermal cameras can be an excellent complement in many situations where conventional cameras are inadequate or insufficient.

They are, of course, unparalleled in a situation of total darkness. They can also be an option in areas that are very difficult to illuminate effectively, for example a sea front, a harbour, or any other vast expanse of open water. Similarly, artificial light not only runs the risk of revealing where the cameras are placed, enabling parties to avoid or vandalise them, but can also create projected shadows in which an intruder can avoid detection.

Furthermore, spotlights can blind as well as illuminate. Therefore, cameras that do not rely on light can be the preferred solution in many different traffic situations, whether it is in railway tunnels, on airstrips or on regular streets. Thermal cameras, on the other hand, cannot be blinded by bright lights or laser beams.

Overall, thermal network cameras perfectly complement and complete a network video system, making sure that objects, people, and incidents are detected 24 hours a day, seven days a week.

Axis’s new AXIS Q1921 and AXIS Q1921-E thermal network cameras are aimed at cost efficient 24/7 area or perimeter surveillance of all security applications such as roads, tunnels and airports. The enhanced resolution and the large variety of lens alternatives ensure improved image quality and detection range. The new cameras integrate perfectly with any network video system, delivering all the benefits that customers have learned to expect from network cameras.

AXIS Q1921 is designed for indoor surveillance, while AXIS Q1921-E is an IP66-rated, outdoor-ready camera, with four available lens alternatives. In addition, they support key IP-Surveillance features such as H.264 and Motion JPEG, audio, local storage and Power over Ethernet. Intelligent video is a key component of any thermal camera, and AXIS Q1921/-E provide tampering alarm, motion detection, and support for AXIS Camera Application Platform.

Both cameras support the ONVIF specification for interoperability of network video products.



Credit(s)




Share this article:
Share via emailShare via LinkedInPrint this page



Further reading:

Smarter security for safer estate living
neaMetrics Suprema Integrated Solutions Surveillance Access Control & Identity Management Residential Estate (Industry)
The expansion of residential estates has led to many communities being constructed with security as an afterthought. Unfortunately, fencing, cameras, and a guard at the gate only create a false sense of safety, which vanishes after the first incident.

Read more...
Secure, long-distance thermal from Keenfinity
Products & Solutions Surveillance Residential Estate (Industry)
The DINION thermal 8100i camera is a bullet thermal camera built for mission-critical applications, prioritising long-distance monitoring and reliable perimeter intrusion detection with built-in Intelligent Video Analytics (IVA) Pro Perimeter video analytics.

Read more...
IVA AI Pro Visual Gun Detection
Products & Solutions Surveillance Security Services & Risk Management Residential Estate (Industry)
Bosch has announced the launch of the IVA AI Pro Visual Gun Detection analytics based on deep learning. It is designed for automatic detection and classification of people and brandished firearms.

Read more...
IP-based horn loudspeakers
Products & Solutions Surveillance Security Services & Risk Management Residential Estate (Industry)
Bosch has announced the launch of its new IP-based horn loudspeakers and amplifier module: the high-output LHN-UC15L-SIP horn (for long-throw applications), the compact LHN-UC15W-SIP horn (for wide-angle coverage) and the AMN-P15-SIP amplifier module.

Read more...
Identity, Security & Access Alliance focuses on intelligence and integration
SMART Security Solutions Ideco Biometrics BoomGate Systems Bosch Building Technologies Technews Publishing Integrated Solutions Surveillance Access Control & Identity Management
The Identity, Security & Access Alliance (ISAA) hosted several launch events in Johannesburg in August, showcasing the participating companies’ technical solutions with a primary focus on the solutions made possible by integrating high-quality systems to deliver comprehensive solutions.

Read more...
Make BIG and COMPLEX small and manageable
neaMetrics Suprema AI & Data Analytics Surveillance Integrated Solutions
Traditional CCTV and access systems often operate separately, creating gaps in visibility and efficiency. TRASSIR and Suprema have partnered to develop an integrated platform that improves security, operations, and situational awareness.

Read more...
Get the AI fundamentals right
Leaderware Editor's Choice Surveillance AI & Data Analytics
Much of the marketing for CCTV AI detection implies the client can just drop the AI into their existing systems and operations, and they will be detecting all criminals and be far more efficient when doing it.

Read more...
SMART Surveillance Conference in Johannesburg
Arteco Global Africa Technews Publishing SMART Security Solutions Axis Communications SA neaMetrics Editor's Choice Surveillance Security Services & Risk Management Logistics (Industry) AI & Data Analytics
SMART Security Solutions hosted its annual SMART Surveillance Conference in Johannesburg in July, welcoming several guests, sponsors, and speakers for an informative and enjoyable day examining the evolution of the surveillance market.

Read more...
LiDAR protects railways from new and existing dangers
Surveillance
3D LiDAR (Light Detection and Ranging) sensors are being installed to monitor rail traffic and ensure safety of passengers as well as individuals walking near the tracks, or trying to perform dangerous stunts for social media.

Read more...
Securing South Africa’s logistics sector
Secutel Technologies Products & Solutions Surveillance Logistics (Industry)
Unlike traditional guarding services, Visual Verifier operates on an ‘Always On’ principle, ensuring continuous 24/7 coverage of warehouses, depots, transit hubs, and delivery points.

Read more...










While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.




© Technews Publishing (Pty) Ltd. | All Rights Reserved.