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Digital video streams are represented by huge amounts of data, burdening its transmission (from the image sensor, where the data is continuously created) and storage alike.
Most if not all cheap webcams come with built-it ASIC to do video compression in real-time.
Support electronics read the image from the sensor and transmit it to the host computer.
The camera pictured to the right, for example, uses a Sonix SN9C101 to transmit its image over USB.
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Webcam can be added to instant messaging, text chat services such as AOL Instant Messenger, and Vo IP services such as Skype, one-to-one live video communication over the Internet has now reached millions of mainstream PC users worldwide.
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.
Webcams have become a source of security and privacy issues, as some built-in webcams can be remotely activated by spyware.
Some of them, for example, those used as online traffic cameras, are expensive, rugged professional video cameras.
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.