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Webcams have become a source of security and privacy issues, as some built-in webcams can be remotely activated by spyware.
To address this concern, many webcams come with a physical lens cover.
The camera pictured to the right, for example, uses a Sonix SN9C101 to transmit its image over USB.
Typically, each frame is transmitted uncompressed in RGB or YUV or compressed as JPEG.
The Australian Antarctic Division operates webcams at its four permanent stations: on the Antarctic continent at Mawson, Casey and Davis, and on sub-Antarctic Macquarie Island. In addition, the krill cam gives an insight into life in the Division’s marine research aquarium where scientists study the the physiology, behaviour and reproduction of krill.
Despite the low cost, the resolution offered as of 2019 is impressive, with now the low-end webcams offering resolutions of 720p, mid-range webcams offering 1080p resolution, and high-end webcams offering 4K resolution at 60 fps.
Image sensors can be CMOS or CCD, the former being dominant for low-cost cameras, but CCD cameras do not necessarily outperform CMOS-based cameras in the low-price range.
Most consumer webcams are capable of providing VGA-resolution video at a frame rate of 30 frames per second.
The term "webcam" (a clipped compound) may also be used in its original sense of a video camera connected to the Web continuously for an indefinite time, rather than for a particular session, generally supplying a view for anyone who visits its web page over the Internet.
Some of them, for example, those used as online traffic cameras, are expensive, rugged professional video cameras.