Dome Color
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Buying a Home Security Surveillance System
The technology used in home security surveillance systems has changed dramatically over the years. Today, the surveillance cameras that come with surveillance systems are smaller, cheaper, and better. Up until a few years ago video footage was recorded onto VHS tape, but today DVR (digital video recorder) systems record video footage onto a hard drive. The price of home security surveillance system has come down dramatically over the last few years. The surveillance cameras and the video recording device are the two main parts of any home security surveillance system.
1. Surveillance Camera Technology
Surveillance cameras either use CMOS or CCD (charge couple device) chips to record video images. In cheaper surveillance cameras CMOS is normally used. CCD surveillance cameras produce better quality video. CCD camera formats are measured in inches, and the larger the format the brighter the images produced. A CCD format of 1/4″ or 1/3″ is good enough for most situations.
The number of TV Lines (TVL) is how the resolution of a surveillance camera is normally specified. This determines how detailed the video picture quality is. A resolution between 350-400TVL is normally produced by surveillance cameras. The number of separate images that a surveillance camera can record per second is said to be the frame rate of the camera. Most camera’s can record at 30fps (frames per second), and video below 30fps is not smooth and begins to look jerky.
A color surveillance camera is not as good as a black and white camera in poor lighting conditions. Lux is the unit of measurement used to indicate a camera's sensitivity to light. A camera must have a light sensitivity of 0.5 lux or lower to be able to view images at night.
2. Surveillance Camera Lenses
The lens of a surveillance camera should match the CCD format of the camera - 1/3″ lenses should be used with cameras with a 1/3″ CCD format. The cameras in most home security surveillance systems have lenses with a fixed focal length – these cameras do not have a facility to zoom in and out. Cameras with a motorized zoom are quite expensive, and allow you to remotely change the camera's focal length.
3. Other Surveillance Camera Features
Some surveillance cameras include Infrared (IR) LEDs, which project an infrared light allowing you view video in complete darkness. The range that these camera’s can see in the dark vary, and is typically between 10 to 50 feet. Home security surveillance systems that have surveillance cameras with a PTZ (pan, tilt and zoom) facility are normally more expensive. Pan, tilt and zoom (PTZ) cameras allow someone to remotely pan a camera left and right, up or down, and to zoom in and out.
4. Surveillance Camera Housings
A home security surveillance system can have large, visible cameras, which are cheaper, have larger housings, and can deter criminals by being clearly visible. Hidden (covert) security cameras are quite small, are more expensive, and are usually hidden within other objects, such as a wall clock. Cameras that have a PTZ (pan, tilt and zoom) facility are normally housed within dome cameras. Dome cameras are normally mounted on the underside of ceilings. Weatherproof security camera casings are used by cameras that need to be protected from the elements. Outdoor surveillance cameras need to be waterproof and to be able to withstand extremes in temperature.
5. Video Surveillance Monitors
Using a standard TV as a video surveillance monitor does not produce the best picture quality. Computer monitors produce better picture quality, and also offer an extended lifespan. If you want to display video from multiple cameras onto a single monitor, then a 15″ monitor should be the minimum size you purchase.
6. Video Surveillance System Recorders
Most home security surveillance systems today record video onto a hard drive and not VHS tape. This has several advantages. Firstly, you can instantly go to any point in time within a recording without having to fast-forward a VHS tape. Secondly, you can playback an earlier part of any camera recording whilst that camera is still recording.
Some home security surveillance systems have cameras with built-in motion detection, which can be set to only record video when motion is detected in a room. This will reduce the hard drive storage space requirements. There is no benefit in buying a VCR system over a DVR system, apart from its cheaper price.
7. PC Based DVR Versus Standalone DVR
There are two types of home security surveillance system, PC based DVR systems, and standalone DVR systems. A PC based DVR system is quite cheap, and is run off an existing PC. An expansion board must be installed into the PC case, and the required software must be installed onto the PC. A standalone DVR system is normally quicker, and more stable when compared against a PC based system.
The recording on a standard DVR security camera system is done using hardware, and this eliminates software crashes that you sometimes get with the PC based DVR systems. DVR systems generally have better performance and reliability than PC based systems.
8. Considerations when buying a Home Security Surveillance System
Your first consideration is the quality of the video you want to record. This is the resolution of video recordings in TV Lines, as well the video frame rate (smoothness) of the recordings. The second consideration is the number of cameras that you will need for your home security surveillance system. Four cameras are normally included with entry-level systems. The size of the hard drive you need for the DVR system is your third consideration. Low-end DVR systems come with 80 gigabyte (GB) hard drives, whilst top-end systems come with a 750GB hard drive.
For more information about home security and home safety, take a look at the Feedage.com news feed for Home Security Buff.
In Colorado is it legal to have colored interior dome lights like dark blue or green?
Ive been sprucen up my car little cheap things that dont make it crazy diffrent like a ricer or anything but i really like the looks of the red and the blue dome lights ive found here
http://cgi.ebay.com/ebaymotors/2-PCS-T10-W5W-168-194-BULBS-1-LED-BLUE-CAR-DOME-LIGHT-/130425696805?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A2003|Model%3AAccord&hash=item1e5dfa3225
But i get pulled over enough as it is living in a strict county and was wondering if anyone new the laws on interior car lighting for Colorado and a link to back it up would be awesome!
As long as you don't have it on while you are driving, you should be fine.
Where to measure white balance (photocritic)
It may be purely coincidental, but over the last few days, I've heard a lot of
buzz about various products that clip onto the front of your camera to help
you white balance your images. The idea is that you place a special lens cap
on your camera, snap a photo, and use that color as a reference color when you
edit your photographs.
The devices come in lots of different types: full-covering caps, dome-shaped
caps, home-made versions made out of coffee filters or Pringles caps, or any
number of other surfaces.
In theory, it's a great idea, but it has a flaw: A white balancing cap like
this measures all light that hits it. Can you spot what the problem might be?
Imagine your lighting set-up is like this, for example
You are in the sun, but your subjects are in the shade. Your white-balancing
cap will measure the light that's hitting your camera (direct sunlight - or
around 5,500 Kelvin or so). However, your subject will be in the shade (around
7,000 Kelvin or thereabouts).
The outcome is utterly predictable: Your white balance is going to be miles
off.
So, what's the solution? It's simple:
**Don't ...
[HD] Tohoshinki - The Secret Code Live at Tokyo Dome - COLORS ~Melody and Harmony
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