images par seconde

OBS: Plus le nombre d'images est élevé, plus l'animation semble fluide.
CONT: La vitesse des mouvements que nous voyons à l'écran résulte du rapport entre la cadence de prise de vues et la cadence de projection. Toutes deux s'expriment en images par seconde. À l'époque du muet, les films étaient tournés à des cadences différentes, généralement entre 16 et 20 images par seconde.

CONT: A standard movie, which is also known as motion picture, can be defined as a sequence of several scenes. A scene is then defined as a sequence of several seconds of motions recorded without interruption. A scene usually has at least three seconds. A movie in the cinema is shown as a sequence of still pictures, at a rate of 24 images per second. Similarly, a TV [television] broadcast consists of a transmission of 30 frames per second ..., 25 frames per second ... or anything from 5 to 30 frames per second for typical videos in the Internet.
OBS: Always in the plural.