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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.
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.
Researchers claim that this method is accurate to ±5 bpm.
Webcams may be installed at places such as childcare centres, offices, shops and private areas to monitor security and general activity.
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.