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