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Various lenses are available, the most common in consumer-grade webcams being a plastic lens that can be manually moved in and out to focus the camera.
Fixed-focus lenses, which have no provision for adjustment, are also available.
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.
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.
One such function has the webcam act as a "magic mirror" to allow an online shopper to view a virtual item on themselves.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.the sensor and the support electronics are built on a single silicon chip to save space and manufacturing costs.Most webcams feature built-in microphones to make video calling and videoconferencing more convenient. The USB video device class (UVC) specification allows inter-connectivity of webcams to computers without the need for proprietary device drivers.
Support electronics read the image from the sensor and transmit it to the host computer.