A digital camera has the same use as an ordinary camera, but the way it functions is different. A digital video camera is composed of three things named as digitizer, grabber, and optical scanner. These devices work as:
Video Digitizer also called frame grabber. A device used in computer graphics that employs a video camera, rather than a scan head, to capture a video image, such as one from television or videotape, and store it in memory with the aid of a special-purpose circuit board. Video digitizers function like display adapters in reverse. A display adapter moves an image from memory to the display; a video digitizer records a displayed image and stores the information in memory in digital (bit) form. Most video digitizers can be attached to any video equipment that produces an RGB (red-green-blue) signal-the standard for video monitors-or an NTSC (National Television Standards Committee) signal-the standard for American television.
Grabber, in computer science is a device for capturing data. Most commonly, the term refers to a special type of computer video memory that receives graphical image data from a video camera or another full-motion video source; the hardware that captures the data and puts it into memory is called a frame grabber or video digitizer. Also, software that takes a snapshot of the currently displayed screen image by transferring a portion of video memory to a file on disk is also due to grabber.
Optical Scanner, a computer input device Input/Output Device that uses light-sensing equipment to scan paper or another medium, translating the pattern of light and dark (or color) into a digital signal that can be manipulated by either optical character recognition software or graphics software.
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