HOW WI-FI SPY CAMERAS WORK
Almost everything these days has to do with wireless technology, and video surveillance is not backing out of the trend either. Wireless cameras or Wi-Fi spy cameras make use of in-built transmitters that enables them to send video over the air to a receiver instead of using a wire. Most Wi-Fi spy cameras get their power source from batteries while there are some that needs to be plugged to an electric source. Electricity or battery, they all work on a simple principle.
A spy Wi-Fi camera contains a wireless RF (radio) transmitter. This transmitter provides the camera with the ability to broadcast the camera’s video, which can then be picked up by a receiver. The receiver will be plugged or connected to a recording device or a monitor. There are receivers that have in-built storage, while others need to be connected to a DVR. The fact that a Wi-Fi spy camera doesn’t use any form of cable or cord makes them easy to hide.
HOW THEY WORK
Image Detection – A wireless spy camera creates its pictures just like every other digital video camera. Light passes through the lens of the camera, which focuses on a small network of light detectors. If the camera is a black and white surveillance camera, the detectors simple gauge the amount of light that is in a specific place on the image. However, in a colored camera, the detectors only measure the green, red, or blue light that comes in, after which groups of three detectors come together to display the color of light in a specific place. Each of these detectors are then combined to make up a complete picture.
There are some wireless spy cameras that come with motion detectors; they are also equipped with a motor that enables them to move automatically to any movement happening in a room. Other cameras are stationary, that is, their focus is usually fixed on a particular spot.
Transmitting the Image – Spy cams are equipped with small radio transmitters that are fixed onto their boards. The camera changes the image into a radio signal on a certain frequency. These radio transmitters are not the large, powerful types, but as small as they are, they can broadcast the image signal sent from the camera to a receiver in the same building. The receiver will pick the signal and turn it back into an image.
Utilizing the Footage – Depending on the purpose it was set for, the receiver can do different types of things with the image. If the spy cam was fixed in a spot for continuous surveillance, the image, along with images from other cameras, might be displayed on a number of video screen, enabling a security guard to watch. You can also record the image either on a computer hard drive or on some other type of storage media.
In other cases, the receiver will only save a number of frames per second, forming a time-lapse picture of the area. This allows you to be able to quickly review the tape while saving more storage space.