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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.Improved video quality has helped webcams encroach on traditional video conferencing systems.
As the bayer filter is proprietary, any webcam contains some built-in image processing, separate from compression.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.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.
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.