To create a television or video picture, the image from the camera lens is focused onto the light sensitive surface of a sensor of some kind – either the target of a camera tube, or more usually nowadays, a solid-state device called a CCD (charge-coupled device). Here a pattern of electrical voltages develops, which corresponds to the light and shade in each part of the image. As these charges are scanned in a series of regular horizontal lines, their values are read off to form a fluctuating voltage – the video signal.
This is conveyed to the TV receiver or video monitor where an electron beam scans across the screen phosphors of the picture tube in exact step with the camera, thanks to a series of regular sync (synchronizing) ...
Get Video Camera Techniques, 2nd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
