PERSISTENCE OF VISION AND FLICKER
The image formed on the retina is retained for about 20 ms even after optical excitation has ceased. This property of the eye is called persistence of vision, an essential factor in cinematography and TV for obtaining the illusion of continuity by means of rapidly flashing picture frames. If the flashing is fast enough, the flicker is not observed and the flashes appear continuous. The repetition rate of flashes at and above which the flicker effect disappears is called the critical flicker frequency (CFF). This is dependent on the brightness level and the colour spectrum of the light source.
In cinema, a film speed of 16 frames per second was used in earlier films to obtain the illusion of movement. Lack of ...
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