Camera, waterproof digital camera, there are many types of cameras, and their basic principles are the same: converting optical image signals into electrical signals for storage or transmission. When we capture an object, the reflected light on the object is collected by the camera lens, which focuses it on the light receiving surface of the camera device (such as the target surface of the camera tube), and then the light is converted into electrical energy through the camera device, thus obtaining the "video signal". The photoelectric signal is very weak and needs to be amplified through a preamplifier circuit, then processed and adjusted through various circuits. The final standard signal can be sent to recording media such as video recorders for recording, or transmitted through a propagation system or displayed on a monitor.