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doc/filters/tiltandshift: apply typo fixes, add introductory description

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Stefano Sabatini 2024-06-03 11:07:27 +02:00
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doc/filters.texi
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@ -23543,11 +23543,12 @@ tile=3x2:nb_frames=5:padding=7:margin=2
@end itemize
@section tiltandshift
Apply tilt-and-shift effet.
What happens when you invert time and space?
Normally a video is composed of several frames that represent a different
instant of time and shows a scence that evolves in the space captured by the
instant of time and shows a scene that evolves in the space captured by the
frame. This filter is the antipode of that concept, taking inspiration by
tilt and shift photography.
@ -23556,13 +23557,13 @@ and this is obtained by placing a slice of pixels from each frame into a single
one. However, since there are no infinite-width frames, this is done up the
width of the input frame, and a video is recomposed by shifting away one
column for each subsequent frame. In order to map space to time, the filter
tilts each input frame as well, so that motion is preseved. This is accomplished
tilts each input frame as well, so that motion is preserved. This is accomplished
by progressively selecting a different column from each input frame.
The end result is a sort of inverted parralax, so that far away objects move
The end result is a sort of inverted parallax, so that far away objects move
much faster that the ones in the front. The ideal conditions for this video
effect are when there is either very little motion and the backgroud is static,
or when there is a lot of motion and a very wide depth of field (eg. wide
or when there is a lot of motion and a very wide depth of field (e.g. wide
panorama, while moving on a train).
The filter accepts the following parameters: