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Cameras, waterproof digital camera cameras a wide variety of the basic principles of the work of the same: the optical image signal to the electrical signal, for storage or transmission. When we shoot an object, the light reflected on the object is collected by the camera lens, focusing on the surface of the camera device (such as the target of the camera tube), and then converting the light into electricity through the camera device, the "video signal" is obtained. Light signal is very faint, need to be amplified by pre-discharge circuit, and then through a variety of circuits to process and adjust, the final standard signal can be sent to record media, such as VCR, or transmitted through the system to display on the monitor.

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