Progressive scan
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Progressive scanning (alternatively referred to as noninterlaced scanning) is a format of displaying, storing, or transmitting
Interline twitter
This rough animation compares progressive scan with
Note: Because the refresh rate has been slowed by a factor of three, and the resolution is less than half a resolution of a typical interlaced video, the flicker in the simulated interlaced portions and also the visibility of the black lines in these examples are exaggerated. Also, the images above are based on what it would look like on a monitor that does not support interlaced scan, such as a PC monitor or an LCD or plasma-based television set, with the interlaced images displayed using the same mode as the progressive images.
Usage in storing or transmitting
Progressive scan is used for scanning and storing film-based material on
Usage in TVs, video projectors, and monitors
Progressive scan is used for most
The disadvantage of progressive scan is that it requires higher bandwidth than interlaced video that has the same frame size and
Advantages
The main advantage with progressive scan is that motion appears smoother and more realistic.[9] There is an absence of visual artifacts associated with interlaced video of the same line rate, such as interline twitter. Frames have no interlace artifacts and can be captured for use as still photos. With progressive scan there is no need to introduce intentional blurring (sometimes referred to as anti-aliasing) 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 video games with this feature is the Super Smash Bros. series starting with Melee, where a "Deflicker" option exists. Ideally, it 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.
Progressive scan also offers clearer and faster results for scaling to higher resolutions than its equivalent interlaced video, such as upconverting 480p to display on a 1080p
See also
- 1440p
- Deinterlacing
- High Efficiency Video Coding
- Progressive segmented frame: a scheme designed to acquire, store, modify, and distribute progressive-scan video using interlaced equipment and media
References
- ^ "Interlacing". Luke's Video Guide. Archived from the original on 2014-02-22. Retrieved February 12, 2014.
- ^ Burns, R.W. John Logie Baird, Television Pioneer, Herts: The Institution of Electrical Engineers, 2000. 316.
- ISBN 1558607927. Retrieved 27 January 2013.
- ISBN 978-0786432431. Retrieved 27 January 2013.
- ISBN 978-0470444375. Retrieved 27 January 2013.
- ^ 4k resolution wikipedia page, that includes a table of 4k display devices with their corresponding prices. Retrieved 29 May 2013.
- ^ Sharp 8k TV launch, Displayed at CES 2013, the Sharp 8k UHD TV. Retrieved 29 May 2013.
- ISBN 978-0495898849. Retrieved 27 January 2013.
- ISBN 978-1897507018. Retrieved 27 January 2013.