Definition of High Motion
There are no commonly-used imaging systems that run at rates higher than 30 frame/s but lower than 48 Hz, so 48 Hz or higher is the de facto standard for high motion. The effects of high motion can be reduced or negated by converter lag when NTSC video is converted to PAL, or vice versa (a particular problem for coverage of international sporting events such as the Olympic Games or the FIFA World Cup, for example); however, more recent motion adaptive converters can minimize this. Showscan’s research indicates that an average of 66.7 frames per second is the upper limit of what the human eye can perceive, and higher frame rates have no further effect, except in reducing flicker. (See Refresh rate.)
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