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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.

A webcam is a video camera that feeds or streams its image in real time to or through a computer to a computer network.

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.

Typically, each frame is transmitted uncompressed in RGB or YUV or compressed as JPEG.

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.Typical interfaces used by articles marketed as a "webcam" are USB, Ethernet and IEEE 802.11 (denominated as IP camera). Various proprietary as well as free and open-source software is available to handle the UVC stream.One could use Guvcview or GStreamer and GStreamer-based software to handle the UVC stream.The Webcam Social Shopper is one example of software that utilizes the webcam in this manner.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.

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