Archive for October, 2008
By Kevino Ng
A dome camera is a great choice for a home ambition system because the camera is concealed inside the dome. Burglars don’t know where the camera is aimed, which makes it more tougher to avoid being monitored.
Dome cameras offer several advantages when used for piece of home security systems. Dome cameras are less vulnerable to vandalism and they can easily be hidden from sight. It’s best to displace the camera manufacturer’s directions, but you guilt lodge a dome camera in a home security silhouette fairly easily by following the steps below.
You can install smoke - colored domes without cameras and no apart, including burglars, will recognize the difference.
1 ) Select the location where you would like to install the dome
camera.
2 ) Drill holes to install the mounting bracket.
3 ) Insert the camera into the dome and connect wiring, if
necessary.
4 ) Adjust the camera to the correct position.
5 ) Test the dome camera to make sure it is working properly.
Outdoor Dome Camera
When placed outdoors, a dome camera authority deters a burglary. Often when a thief sees a dome camera, he will bypass your home and move onto extended. If he isn’t dissuaded also decides to go ahead and burglarize your home, a dome camera will capture the crime on vinyl. When installing your video surveillance system, consider positioning a dome camera in the following outdoor areas:
• front door / porch
• back door
• sides of your home
• garage doors
Installing the correct type of dome camera is as big-league, if not more so, than installing the dome camera in the first place. An outdoor dome camera should be equipped with infrared lighting and a vandal - half-cooked housing.
Indoor Dome Camera
An indoor dome camera gives you and your homely added protection in the case of an intruder. If, by some chance, a criminal manages to evade your outdoor dome camera and bypass your security formation, indoor dome cameras commit video the criminal act. Placement of your indoor dome camera can determine the effectiveness of your unbroken security system. An indoor dome camera should be mounted agency:
• entryways and foyers
• hallways
• rooms with low lighting
Lastly integrating video introspection into your home security outline allows you to catch a criminal red handed. Having the footage of a pilfering gives the police visual evidence of the crime. And a dome camera, whether it is mounted indoors, outdoors, or both, captures a 360 nuance scale of your home and your hard cash.
Securing your home and protecting your family are both important and vital in today’s world.
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For information, and more related articles by this author Visit: http://www.ihomesecurity.info and http://www.articlenewsinfo.com Article Source: http://EzineArticles.com/?expert=Kevino_Ng |
Spy cameras and security cameras have been quite familiar since ages, these gadgets deliver video on a regular basis. Humans since time immemorial had the urge to spy, be it for war or to create a strategy against enemies. Nowadays it has become a norm to have one installed for benefits in both our personal life and professional life. Reason may be any but the main criteria is to protect your loved ones and safeguard your belongings.
If you are a working parent who is constantly worried about the state of your kid or a business owner who is suspicious of the staff damaging the firm’s reputation; in both the cases this is a solid ground for you to take things in control and install a spy cam. People behave differently when they have the knowledge that they are being captured on tape, they make a conscious effort to hide the motive in their head. A top notch and innovative gadget that puts all your whims to bay is the pinhole camera.
For those not aware of what a pinhole camera is, it is a miniscule looking camera that is going to provide crisp video at all given times. The data output has high degree of quality and is not compromised by any kind. It has excellent night vision feature which will capture with excellent lighting. The two main features that these Pinhole spy cams are preferred than its other counter parts are- its amazing size and ease of use.
Firstly the size factor, it provides the end user with more mobility and flexibility. Earlier with the larger and bulkier cameras it was difficult to place them; but now with the advances in technology this is the top notch camera which gives the best in a smaller size. It is a size of a button; you can just imagine the number of options that are opened for you. Secondly the ease of use, it benefits in keeping potential hazards of your home and office at bay. No one but you will ever be suspicious that something is fishy. But every move of the entire room is under supervision and you will be over an edge against all harm that could have been caused to you.
Just imagine the endless possibilities that these spy cams bring for us humans. It can be placed in practically any home appliance from a smoke detector to a pen on your desk table. This powerful technology has changed the world we live in, if the present is like this the future is going to be incredible. The market is producing many innovative gadgets to suffice the needs of humans. Not only will they be smaller in size but reap great benefits for us.
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A pinhole camera is the simplest medium in the art of photography. The pinhole camera is also very unique camera because it takes pictures without using any lens. Interesting, isn’t it? You see, the small hole in the pinhole camera actually acts like an ordinary lens. A clear discussion of why this is so is found in this article. The simplicity of the how a pinhole camera works is amazing. One can’t help but be blown away by it.
What Does a Pinhole Camera Look Like?
Before we discuss how a pinhole camera works, we need to know what a pinhole camera looks like. A pinhole camera is a box with a very small hole in the middle. Any box made of light material will do. The box should be light-proof. So that light can’t enter except through the small hole, you can cover the box frame using black tape. But you need to put on the opposite of the hole inside the box first. After that, you can make a very small hole by using a pin going through a piece of aluminum foil and then taping it over the hole in the box. A small piece of cardboard taped on one side over the pinhole can be used as a shutter. When everything is ready, pick any object or scenery, put the pinhole camera in front of it, open the shutter, and briefly expose your film to take a picture.
How A Pinhole Camera Works - The Facts
The secret behind how a pinhole camera works lies in the small hole in the middle of the box because the smaller your pinhole is, the sharper your picture would look. According to Wikipedia.com, rays of light enter through the small pinhole and is projected to a certain area on the film. Furthermore, if the pinhole is very small, finer and thinner beams of light would be captured. However, thin streams of light tend to bend when they make contact with the film. Even if the lines of the image look sharp, the overall picture can be a little blurry.
So how does the pinhole camera actually work? Now, let’s say that you want to use your pinhole camera to take a picture of a flower. The flower bounces off a certain amount of light so that it can be seen. The very small hole in your pinhole camera captures all the streams of light that the flower emits and projects it upside-down into the film.
You need to use mirrors to have the correct perspective. Howstuffworks.com states that the very small hole in your pinhole camera functions like an ordinary lens. In other words, it is not really accurate to say that a pinhole camera has no lens because the small pinhole actually works like a lens.
Now you know how a pinhole camera works - by simply capturing light and projecting it to specific areas on the film. This simple concept is also used in digital cameras which use high-powered lenses.
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Visit Video-Surveillance-Guide.com for more articles on how a pinhole camera works, as well as the latest on hidden surveillance cameras like the Linksys Wireless G Internet video camera. Article Source: http://EzineArticles.com/?expert=Nahshon_Roberts |
We encounter the video compression standard MPEG everywhere particularly in the consumer sector. Internet, DVD, digital television or digital camcorders, motion images of any kind are compressed using the MPEG standard. Consumer applications mainly focus on replay and transmission of MPEG-compressed video films. The calculating time needed for generating a high-quality and strongly compressed video sequence is irrelevant. When rewinding or displaying freeze images, time lags or jumping’s are accepted. Solely a high compression rate allowing quickly transmitting and replaying the video film is of importance.
Just different for applications in video surveillance systems (CCTV).
The main focus is placed on real-time compression, high picture quality with preferably large compression rate, low bandwidths and storage costs, short latencies when transmitting live images and ideal replay mechanisms.
The currently available multimedia encoders are not suited for such applications.
The DSP-based GeViScope real-time encoder developed by GEUTEBRÜCK offers ideal performance features for CCTV-applications:
Picture formats:
For each GeViScope media channel the requested picture format can be adjusted separately for permanent or event-triggered recordings:
704 (H) x 288 (V) Picture elements (field, 2CIF),
352 (H) x 288 (V) Picture elements (CIF),
176 (H) x 144 (V) Picture elements (QCIF)
704 (H) x 576 (V) Picture elements (frame, 4CIF) on request
A smaller picture format results into a proportionally smaller picture file size after compression.
DCS - Dual Channel Streaming
Parallel recording and network matrix.
One camera picture (frame) consists of two fields. At any one time GeViScope records one field and transmits the second field into the network. This separate processing allows live recordings with up to 25 fps (fields per second) and parallel live transmissions in the network with up to 25 fps per video channel (network matrix). The latency time for MPEG4CCTV transmissions is very low and amounts to < 150 ms in undisturbed networks and is therefore identical to M-JPEG.
VFR - Variable Frame Rate
The picture rate for permanent recordings and event-triggered recordings can be adjusted variably. The adjustment range goes from live (25 fps) up to time-lapse recordings with for example 1 picture / 10 s.
GeViScope Dual Sensor - Licence/GSC/Dual-Sensor
The GeViScope Dual Sensor (GSC/Dual-Sensor) combines Video Motion Detection (GSC/VMD) with intelligent Video Analytics (GSC/VA-Class) in one system
GSC/VMD - The proved 3-D Video Motion Detection evaluates in adjustable intervals (measure cycles) a measurement (measurement value) for the average brightness in each VMD zone individually set in the video picture (max. 128). The evaluation algorithm of the VMD compares these measurement values in relation to the set sensitivity and diversifies between global and local changes, i.e. whether there are changes to brightness in many VMD zones or in only one VMD zone. Local changes will be considered as alarm, global changes will be ignored (adjustable). VMD zones can be connected to chains in order to detect direction-dependent or speed-dependent motions in the video picture.
The most important features of GSC/VMD:
- 128 VMD zones are freely definable in function, position, size and sensitivity
- Measure cycles of up to 40 ms to 10 s for real time detection of very fast and very slow motions
- Three-dimensional field adaptation via special perspective function
- Algorithm for diversification between local and global changes in the picture
- Collection and evaluation of direction and speed
- Vector function can be switched on
SC/VA-Class - Intelligent Video Analytics permanently analyses the pixels in the complete video picture and generates a background model of the scene in a self-learning mode. The background model is continuously updated in order to take over global picture changes. Objects to be detected are defined in the setup according to size, speed, motion direction and status. Up to 64 areas of interest can be set for the video picture. These trigger different kinds of alarm behavior upon detection of an object. If a group of pixels in the updated picture changes in comparison to the background model the system calculates whether this group of pixels corresponds to the characteristics of a pre-defined object and reports an alarm according to the settings for the areas of interest.
The most important features of GSC/VA-Class:
- Intelligent real-time analysis of video data
- 64 areas of interest / areas of non-interest
- Classification of persons and cars plus their characteristics as for example speed, size, direction and
- status (fast, slow, in motion)
- Three-dimensional detection of object size by parameterizable reference lines (definition of real distances in the picture)
- Motion Tracking
- Detection of abnormal activities and security-relevant situation
- Automatic tracking of moving persons
- Video Motion Detection (GSC/VMD) and Intelligent Video Analytics (GSC/VA-Class) run on one video channel each. Each system is parameterized separately and reports separately any activity in the video picture to the Dual Sensor analytics. A Dual-Sensor alarm is only generated if both systems (AND gating) report a detected motion simultaneously (in a time period to be set).
The author of this is the managing director of sse installations Sydney Australia. Please visit us at sse installations for more details.
Article Source: http://EzineArticles.com/?expert=Daniel_Kneitel
On Every Pole a School CCTV Camera
Students are screaming murder that they are not getting some privacy anymore even in the johns. But teachers know that strange things happen there all the time. Incidents like smoking, drinking, and some hair pulling and bullying can be enacted there with impunity if there is no CCTV camera watching. Conclusion - students have to behave in there or get a pass to the Principal’s office.
But instead of whining about the school surveillance cameras, why not make it work for you? Since there are cameras everywhere, you can use these to your advantage if you want to be discovered for your dancing, singing, or athletic talent. Sounds unbelievable? Well, teachers are rabid talent scouts and they can know real talent when they see one. An invitation to an audition will come your way in no time.
Instead of scuttling a CCTV camera on the school playgrounds, strut your stuff with like-minded friends. Certainly, the entire show will caught on CCTV and who knows, a talent scout may see your potentials as drama actor, cheerleader, gymnast or comic. You might get kudos from a talking CCTV camera!
One more thing, show your teachers you studied hard for exams by concentrating on your paper, not you neighbor’s. Got a high grade for once? The teachers won’t doubt you because everything is on tape even if they play the tape on slow motion they’ll see you haven’t moved a hair during the exams. Aren’t those spy cameras cool?
Teachers and Security Cameras
The school CCTV camera inside the classroom is an essential item. It deters cheating, and unruly behavior. Since everything is on tape, there is no error in finding out the culprits and the cheaters.
Although teachers are not the prime target of security cameras, they are also caught on tape giving exams, lectures, and subject demos. The taped video recording can be used to evaluate a teacher’s performance in classrooms. If you are the teacher, ask the principal if you can view the video taped recordings so you can review it and check out the following:
- Are you taking charge in the classroom?
- Evaluate your impact on students, do they listen?
- Distinguish the different reaction of students to your lectures, are they bored?
- Evaluate class participation
- Check your posture, is it threatening?
- Are you doing all the talking?
- Are you frequently referring to your notes
- Do the students prefer lectures or do they perform better with self-regulated goals?
Your behavior in the classroom also reflects the way you are as a teacher. Viewing the tapes caught by your classroom CCTV camera helps you see yourself from a different perspective and you can self-assess your weak and strong points and improve your teaching strategies to pull up your performance a notch higher.
Although teaching skill is important, it is also critical that teachers have the will to teach. You’ll know from the video tape if you’re a committed and energetic teacher with smart ideas or teacher who is bored and dissatisfied with teaching. The CCTV camera does not lie.
by Giles May
Your home is important to you and there’s nothing more distressing than a break in. These days, home security is relatively inexpensive, and in every area there are lots of companies that can install burglar alarms.You should be extremely careful when commissioning a company to install a security system, and with so many companies around, it can be daunting to choose between them. Here’s the “due diligence” you should conduct to ensure you find a quality security company.
1. Does the company offer free surveys? Be wary of any company that won’t attend your property and offer a free survey/consultation and quotation. A good company will make constructive suggestions for your home security, and provide your with a free detailed survey & quotation, and certainly not pressure your for a decision on your doorstep.
2. Are they an established reputable local specialist? Local companies seek to preserve the good reputation they have built up by providing superb service and will be only too pleased to offer references. Also, If you look around your local area, you will see alarm company stickers on external alarm boxes,. This is a good sign of the most popular specialists in your area, which should help you draw up a shortlist to contact.
3. Are they a member of any trade associations? Find out which one and check that they are an established association online. Avoid those companies that belong to minor associations that can be joined easily and cheaply. Most security installers will display details of their accreditations online, so by searching online you can become familiar with the reputable security associations.
4. What guarantees & warranties will you get? Avoid anyone who doesn’t offer at least a one year warranty on part and labour. If the system malfunctions, how long will they take to respond and attend your property to fix it? Finally, do they offer maintenance and monitoring services as well.
5. Do they project an aura of professionalism? The representative who does the first visit must seem professional to you. Check their paperwork - does it professional looking or do they write on scrap paper? Are their vehicles clean and sign written ? If you have nay doubts about their professionalism at this stage, then you are unlikely to be happy with the end result.
6. Finally, do the details of the alarm they are quoting you for, match your needs and lifestyle? Have you told them about your pets, children and any specific requirements you may have. That way they can match a system towards your specific needs. If you feel you have to change your lifestyle to conform with their alarm system, then seek an alternative.
If all the above conditions are met, then go with the company you feel most confident in. It’s not always down to price, especially when protecting your greatest and most important investment - your home.
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