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making them the lowest-cost form of videotelephony.
Despite the low cost, the resolution offered at present (2015) is rather impressive, with low-end webcams offering resolutions of 320×240, medium webcams offering 640×480 resolution, and high-end webcams offering 1280×720 (aka 720p) or even 1920×1080 (aka 1080p) resolution.
Webcam features and performance can vary by program, computer operating system, and also by the computer's processor capabilities.
Video calling support has also been added to several popular instant messaging programs. Software is available to allow PC-connected cameras to watch for movement and sound, a computer e-mailed images of the burglar during the theft of the computer, enabling the owner to give police a clear picture of the burglar's face even after the computer had been stolen.
Other popular uses include security surveillance, computer vision, video broadcasting, and for recording social videos.
The video streams provided by webcams can be used for a number of purposes, each using appropriate software: Most modern webcams are capable of capturing arterial pulse rate by the use of a simple algorithmic trick.
Improved video quality has helped webcams encroach on traditional video conferencing systems.
When "captured" by the computer, the video stream may be saved, viewed or sent on to other networks via systems such as the internet, and emailed as an attachment.
They have also become a source of security and privacy issues, as some built-in webcams can be remotely activated by spyware.
The most popular use of webcams is the establishment of video links, permitting computers to act as videophones or videoconference stations.
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