Motion interpolation – China 3D Cinema System – Mini 4D Cinema System Manufactur
Applications
HDTV
Motion interpolation is used in various display devices such as HDTVs and video players, aimed at alleviating the video artifacts introduced by framerate conversions in fixed-framerate displays such as LCD TVs. Films are recorded at a frame rate of 24 frames per second (frame/s) and television is typically filmed at 25, 50, 30 or 60 frames per second (the first two being PAL, the other two from NTSC). Normally, when a fixed framerate display such as an LCD screen is used to display a video source whose framerate is less than that of the screen, frames are often simply duplicated as necessary until the timing of the video is matched to that of the screen, which introduces a visual artifact known as judder, perceived as “jumpiness” in the picture. Motion interpolation intends to remedy this by generating intermediate frames that make animation more fluid. This feature has received many criticisms from many consumers because it made special effects in movies appearing less realistic, and decreasing the quality of the cinematography of the film.
It should be noted that, while common, not all 120 Hz HDTVs include a motion interpolation feature. Also, anti judder technology is not the same as motion blur reducing technology, but is frequently lumped together with it.
The commercial name given to motion interpolation technology varies across manufacturers, as does its implementation.
Hitachi – Reel120
Insigna – DCM Plus, for Digital Clear Motion 120 Hz
LG – TruMotion 120 Hz, 240 Hz
Mitsubishi – Smooth 120 Hz
Panasonic – Intelligent Frame Creation (IFC)
Philips – HD Digital Natural Motion
Samsung – Auto Motion Plus 120 Hz, 240 Hz
Sharp – Fine Motion Enhanced
Sony – MotionFlow 100 Hz, 100 Hz PRO (XBR series, Australia), 120 Hz, 200 Hz, 240 Hz.
Toshiba – ClearScan 120 Hz, 240 Hz
Vizio – MEMC (Motion Estimation, Motion Compensation)
Side Effects
Several Side effects can be introduced by the use of the technology.
Stable Image (Positive)
According to CNET.com executive editor David Carnoy, with Sony’s MotionFlow motion interpolation objects look more stable when the feature is turned on. This is sometimes accompanied by a glitch in the picture. Not everyone likes the effect and some complain that it gives film a “video” look.
Artificial look (Negative)
The “video” look side effect is also commonly referred to as “Soap Opera Effect” after the way those shows looked, having been shot on cheaper 30Hz video instead of regular broadcast equipment or film.
Artifacts
Some implementations can result in added image artifacts such as “underwater” blurring.
PC video players
WinDVD uses Philips’ TrimensionDNM for frame interpolation.
CrystalPlayer uses Motion Morphing MultiSampling for frame interpolation.
PowerDVD uses TruTheater Motion for interpolation of DVD and video files to up to 72 FPS.
See also
HDTV blur
Television standards conversion
VidFIRE
Motion Compensation
References
^ http://shepherdsons.wordpress.com/2008/01/27/hd-ruins-movies-120hz-1080p-fake/
^ a b Carnoy, David (October 25, 2007). “Six things you need to know about 120 Hz LCD TVs”. CNET.com. http://reviews.cnet.com/4520-6449_7-6792632-1.html. Retrieved 2008-02-02.
^ Hitachi to Unveil New Line of Ultra Thin LCDs at CES
^ Trimension
^ Samsung LN-T4071F
^ Sharp intros slate of new AQUOS LCD HDTVs
^ SONY UNVEILS FIRST BRAVIA FLAT-PANEL LCD HDTVs WITH INTERNET VIDEO LINK COMPATIBILITY
^ Sony’s site for explaining Motionflow 200Hz using the world’s largest zoetrope and Kak
^ a b Moskovciak, Matthew (January 8, 2008). “Vizio adds 120 Hz LCDs to its lineup”. CNET.com. http://ces.cnet.com/8301-13855_1-9845306-67.html. Retrieved 2008-02-01.
^ Biggs, John (August 12, 2009). “Help Key: Why 120Hz looks eird”. crunchgear.com. http://www.crunchgear.com/2009/08/12/help-key-why-hd-video-looks-weird. Retrieved 2009-11-13.
^ Intervideo WinDVD 8 Platinum
^ Crystal Reality – ultimate video and multimedia solutions for PC, Symbian and PocketPC platforms
^ “Video Enhancement – TrueTheater Technology”. CyberLink. http://www.cyberlink.com/stat/technology/enu/true-theater-solution.jsp. Retrieved 2009-08-24.
Categories: Display technology | Video processing
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