scanner definition by Webster's New World
scanner definition by American Heritage Dictionary
- One that scans.
- A receiver that continuously broadcasts signals it detects from specified radio frequencies: heard about the robbery over the police officer's scanner.
- An optical scanner.
- A device, such as a CAT scanner or PET scanner, for observing internal organs, tissues, and other parts of the body,
scanner - Computer Definition
Uses rules to scan for vulnerabilities on the network, computer system, application program, or Web-based service, typically working with a list of known vulnerabilities. Some Web-application scanners scan for vulnerabilities within applications.
(1) A synonym for antivirus program.
(2) A smartphone application that reads bar codes. See mobile tagging.
(3) An optical device that reads a printed page or transparency and converts it into a graphics image for the computer. The scanner does not recognize or differentiate in any manner the content of the material it is scanning. Everything is converted into a bitmapped image, which is a pattern of dots. See bitmapped graphics. Optical Character Recognition (OCR) Optical character recognition systems use scanners to capture printed text and convert it into computer-readable characters for editing. See OCR and document scanner. Scanners and Cameras Scanners are similar to digital cameras, except cameras can focus into infinity. Desktop scanners have physical dimensions that determine the size and bulk of the material that can be scanned. Automatic feeders are used to scan stacks of paper, typically for OCR jobs. Scanners are rated in dots per inch (dpi), whereas cameras are rated in total pixels. Both scanners and cameras have an optical resolution (the real lens resolution) and an interpolated resolution computed by software. The higher the optical, the better. Scanners are also rated by the maximum bit depth of each pixel (how many colors can be stored). At minimum, scanners support 24-bit color, and many go up to 48 bits. See optical resolution, interpolated resolution, 4K resolution, document scanner, flatbed scanner, sheet-fed scanner, handheld scanner, drum scanner, slide scanner, photo scanner and digital camera.