Abstract: A device for encoding sequences of frames constituted by video-type images of a first frequency (for example, 30 Hz) and film-type images whose original frequency is lower than this first frequency (for example, 24 Hz) and which are converted by means of the "3:2 pulldown" technique.The encoding device comprises;a circuit for detecting the sequences of film-type images from the stream of input data, anda device for preprocessing these sequences for realizing an inverse conversion of the frequency by eliminating, before encoding, the redundant information introduced by the use of the "3:2 pulldown" method.

Abstract: Device for encoding interlaced-field picture signals, comprising a first variable-length encoding channel (10) and an associated first prediction channel (20), as well as a second variable-length encoding channel (30), arranged in parallel with the first channel and including at its input side a circuit (31) for de-interlacing the fields, an associated second prediction channel (40) including a circuit (45) for re-interlacing the fields and a decision sub-assembly (50) for comparing the signals supplied by coding in the respective first and second encoding channels and selection of the prediction and encoding channels as a function of the result of said comparison.