Progressive Scan - Usage in TVs, Video Projectors, and Monitors - Advantages of Progressive Scan

Advantages of Progressive Scan

  • Absence of visual artifacts associated with interlaced video of the same line rate, such as interline twitter.
  • No necessity in intentional blurring (sometimes referred to as anti-aliasing) of video to reduce interline twitter and eye strain.
In the case of most media such as DVD movies and video games, the video is blurred during the authoring process itself to subdue interline twitter when played back on interlace displays. As a consequence, recovering the sharpness of the original video is impossible when the video is viewed progressively. A user-intuitive solution to this is when display hardware and video games come equipped with options to blur the video at will, or to keep it at its original sharpness. This allows the viewer to achieve the desired image sharpness with both interlaced and progressive displays. An example of a video game with this feature is Super Smash Bros. Brawl, where a "Deflicker" option exists. Ideally, "Deflicker" would be turned on when played on an interlaced display to reduce interline twitter, and off when played on a progressive display for maximum image clarity.
  • Offers clearer and faster results for scaling to higher resolutions than its equivalent interlaced video, such as upconverting 480p to display on a 1080p HDTV.
HDTVs not based on CRT technology cannot natively display interlaced video, therefore interlaced video must be deinterlaced before it is scaled and displayed. Deinterlacing can result in noticeable visual artifacts and/or input lag between the video source and the display device.
  • Frames have no interlace artifacts and can be captured for use as still photos.

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