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As the bayer filter is proprietary, any webcam contains some built-in image processing, separate from compression.

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.

Most models use simple, focal-free optics (fixed focus, factory-set for the usual distance from the monitor to which it is fastened to the user) or manual focus.

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.

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 Wii Remote contains an image sensor with a resolution of 1024×768 pixels.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.Some cameras, such as mobile-phone cameras, use a CMOS sensor with supporting electronics "on die", i.e.the sensor and the support electronics are built on a single silicon chip to save space and manufacturing costs.

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