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

Powered by:

SearchCompliance

  • PCAOB (Public Company Accounting Oversight Board)

    The Public Company Accounting Oversight Board (PCAOB) is a Congressionally-established nonprofit that assesses audits of public ...

  • cyborg anthropologist

    A cyborg anthropologist is an individual who studies the interaction between humans and technology, observing how technology can ...

  • RegTech

    RegTech, or regulatory technology, is a term used to describe technology that is used to help streamline the process of ...

SearchSecurity

  • Advanced Encryption Standard (AES)

    The Advanced Encryption Standard, or AES, is a symmetric block cipher used by the U.S. government to protect classified ...

  • identity theft

    Identity theft, also known as identity fraud, is a crime in which an imposter obtains key pieces of personally identifiable ...

  • spear phishing

    Spear phishing is an email-spoofing attack that targets a specific organization or individual, seeking unauthorized access to ...

SearchHealthIT

SearchDisasterRecovery

  • call tree

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

  • mass notification system (MNS)

    A mass notification system is a platform that sends one-way messages to inform employees and the public of an emergency.

  • disaster recovery as a service (DRaaS)

    One approach to a strong disaster recovery plan is DRaaS, where companies offload data replication and restoration ...

SearchStorage

  • CIFS (Common Internet File System)

    CIFS (Common Internet File System) is a protocol that gained popularity around the year 2000, as vendors worked to establish an ...

  • GlusterFS (Gluster File System)

    GlusterFS (Gluster File System) is an open source distributed file system that can scale out in building-block fashion to store ...

  • virtual memory

    Virtual memory is a memory management capability of an OS that allows a computer to compensate for physical memory shortages by ...

SearchSolidStateStorage

  • Tier 0

    Tier 0 (tier zero) is a level of data storage that is faster, and perhaps more expensive, than any other level in the storage ...

  • PCIe SSD (PCIe solid-state drive)

    A PCIe SSD (PCIe solid-state drive) is a high-speed expansion card that attaches a computer to its peripherals.

  • SSD caching

    SSD caching, also known as flash caching, is the temporary storage of data on NAND flash memory chips in a solid-state drive so ...

SearchCloudStorage

  • RESTful API

    A RESTful application program interface breaks down a transaction to create a series of small modules, each of which addresses an...

  • cloud storage infrastructure

    Cloud storage infrastructure is the hardware and software framework that supports the computing requirements of a private or ...

  • Zadara VPSA and ZIOS

    Zadara Storage provides block, file or object storage with varying levels of compute and capacity through its ZIOS and VPSA ...

Close