Scan

Scan

[skan]
Scan may refer to:

Scanning may refer to:

  • Scanning, in television, facsimile, and picture transmission, the process of sequentially encoding the luminosity and optionally the color of a picture or scene, line by line into an electronic signal. It also refers to remotely reconstructing the picture or scene on a display device.
  • Scanning, in telecommunications, the process of rapidly tuning a radio receiver through a predetermined range of frequencies to select an active radio broadcast. Scanning may be performed manually or automatically.
  • Counter-scanning, in physical micro and nanotopography measuring instruments like scanning tunneling microscope, atomic force microscope, etc., a way to eliminate image distortions caused by slow drift of the instrument probe relative to a measured sample surface.
  • Scanning, in radar and radio direction-finding, the slewing of an antenna or radiation pattern for the purpose of probing in a different direction. In radar, scanning may be mechanical, using a rotary microwave joint to feed the antenna, or electronic, using a phased array of radiators, the radiated pattern (beam) of which depends on the relative phases of the signals fed to the individual radiators. In civilian air traffic control radar, scanning usually implies continuous rotation of the antenna or beam about a vertical axis. In military radars, scanning may occur about other than a vertical axis, and may not encompass a full 360°.
  • Scanning, in teaching reading, the technique for quickly finding specific information in a text while ignoring its broader meaning.
  • Scanning, in the semiconductor electronics testing industry, to test the logic used in an integrated circuit in a non-functional method by using a special test mode. This mode generally changes the configuration of the device being tested to look more similar to a large shift register. Logical blocks are then tested by loading and unloading this register. (See for instance JTAG Boundary Scan.)
  • Scanning, a term for the medical technique for body imaging.
  • Scanning, the term for the lowest-level work of a software compiler, putting together the individual characters of the text of a computer program to form lexemes.
  • Scanning, a behaviour in which prey animals look around for possible predators.

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