| a href=" cameras are the most common method of | | | | People have repeatedly challenged the widespread |
| surveillance. Originally, they were analog video, but | | | | use of security cameras, claiming that their use |
| digital security cameras have become more | | | | results in loss of privacy and loss of civil liberties. This |
| commonplace. | | | | is particularly true in London, where critics have |
| Digital security cameras do not rely on videotape | | | | argued that security cameras exist more for |
| recorders and subsequently do not have to have the | | | | controlling the general populace than for crime |
| tapes constantly replaced. However, the digital file | | | | prevention. Similar arguments have cropped up in |
| can fill up hard drive space. Higher quality security | | | | Chicago and New York, where security cameras |
| camera images, comparable with DVD quality, only | | | | have become more prevalent. |
| make the files larger. Fortunately, several techniques | | | | Personal security cameras have also become more |
| exist to solve the problem. One of the most | | | | popular. These can be plugged into a computer's USB |
| common solutions is the use of motion detectors. | | | | port, and monitor cubicles or single rooms. As many |
| These signal security cameras when to begin | | | | of these security cameras have a resolution of 4 |
| recording, and when to save power by intermittently | | | | million pixels, quality is not a problem. |
| filming. | | | | |