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 bs or videoconference stations.
The lenses of the cameras are removed and then these are attached to telescopes to record images, video, still, or both.
In newer techniques, videos of very faint objects are taken for a couple of seconds and then all the frames of the video are "stacked" together to obtain a still image of respectable contrast.
When sent to a remote location, the video stream may be saved, viewed or on sent there.
Unlike an IP camera (which connects using Ethernet or Wi-Fi), a webcam is generally connected by a USB cable, or similar cable, or built into computer hardware, such as laptops.
Video features, including faces, shapes, models and colors can be observed and tracked to produce a corresponding form of control.