Browse Definitions:
Definition

scan converter

A scan converter is a hardware device that converts a video signal into a format compatible with a specific type of display. The most common scan converter translates digital computer video signal s into a format suitable for viewing on a conventional analog television set. Devices also exist that can convert conventional TV signals into computer-display format.

Scan conversion is a sophisticated process, because the raster (set of horizontal lines) in a conventional TV video signal is interlaced, while the raster in a computer display is normally non-interlaced. In an interlaced display, the horizontal lines are scanned alternately in two interwoven rasters, so a complete frame requires two raster scans. In a non-interlaced display (also called progressive scan), the lines are scanned sequentially from the top to the bottom of the screen, so a complete frame requires only one raster scan.

Scan conversion can degrade the image resolution (detail) of a video display. This is not necessarily a problem with large-screen or projection-image TV sets when they are used for presentations, where the images rarely involve fine detail. But it can present a problem for the serious graphic artist, or for the user who must work with document files or complex Web pages containing large amounts of text in small point sizes.

Besides the typical TV-to-computer or computer-to-TV applications, specialized scan converters can be obtained for applications such as:

  • Conversion of radar images to computer-display format.
  • Conversion of images from a cathode-ray oscilloscope to computer-display format.
  • Conversion of slow-scan television ( SSTV ) images to conventional TV or computer-display format.
  • Viewing analog video tapes on computer displays.
  • Use of computer imagery in teleconferencing.
This was last updated in September 2006

Start the conversation

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • internal audit (IA)

    An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

  • pure risk (absolute risk)

    Pure risk, also called absolute risk, is a category of threat that is beyond human control and has only one possible outcome if ...

  • risk assessment

    Risk assessment is the identification of hazards that could negatively impact an organization's ability to conduct business.

SearchSecurity

  • biometrics

    Biometrics is the measurement and statistical analysis of people's unique physical and behavioral characteristics.

  • principle of least privilege (POLP)

    The principle of least privilege (POLP), an important concept in computer security, is the practice of limiting access rights for...

  • identity management (ID management)

    Identity management (ID management) is the organizational process for identifying, authenticating and authorizing individuals or ...

SearchHealthIT

SearchDisasterRecovery

  • business continuity and disaster recovery (BCDR)

    Business continuity and disaster recovery (BCDR) are closely related practices that describe an organization's preparation for ...

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

  • call tree

    A call tree -- sometimes referred to as a phone tree -- is a telecommunications chain for notifying specific individuals of an ...

SearchStorage

SearchSolidStateStorage

  • hybrid hard disk drive (HDD)

    A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close