cadence correction
The reversal of telecine pulldown cadences in video material in order to restore the original progressive film image. Cadence correction merges appropriate adjacent fields to reproduce the original frame sequence. The best results are obtained if cadence correction is available to detect and reverse a pulldown sequence before deinterlacing is performed. Also called "film mode detection," "reverse telecine," "inverse telecine" and "reverse 3:2 pulldown."
Advanced cadence correction circuits can also detect erroneous cadences, such as 3:2:3:2:2, which come from poor editing in the studio. This happens often when there are a lot of cuts, and frame alignment is not performed carefully each time. See deinterlace and telecine.
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| Correcting Cadence |
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| Algolith's Dragonfly removed the telecine cadence in this example to produce the result at the bottom. The Dragonfly is a separate, high-end component used in home theaters (see videophile). (Image courtesy of Algolith inc., www.algolith.com) |