Computer generated video wipe effects
AssigneeAdobe Systems Incorporated
InventorsRobert J. Alig, Gerald A. Raitzer, Michael Shinsky
Life of this patent
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Abstract
A computer-based video editing system provides software controlled wipes between scenes. These wipes may be the conventional horizontal, vertical, or clock type wipes used in video to transition from one scene to the next. Instead of being generated by conventional digital wave form generators, the wipes are generated as a bit map in computer memory, thus allowing the editor to design his own wipes as desired. The wipes are generated by comparators which have as their inputs line-by-line video data and computer controlled threshold data so as to control a video switcher to select between scenes as determined by the wipe pattern.
Claims11
A method of generating a video wipe effect comprising the steps of:
- storing a wipe pattern;
- providing a high threshold level and a low threshold level;
- comparing the high threshold level to the stored wipe pattern;
- comparing the low threshold level to the stored wipe pattern;
- providing a first control signal in response to the comparisons of the wipe pattern and the high and low threshold levels;
- determining a resulting video signal from a number representing a ratio of a first video signal to a second video signal, as determined by the stored wipe pattern, and providing a second control signal in response thereto;
- and
- switching between at least the first and second video signal in response to the first and second control signals.
Dependencies are inferred from the claim text.