Stabilization and Interlacing

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‌Stabilization and Interlacing

Interlaced footage presents special problems for stabilization, because jitter in the positioning between the two fields is equivalent to jitter in camera position, which we’re trying to remove. Because the two different fields are taken at different points in time (1/30 th or 1/25th of a second apart, regardless of shutter time), it is impossible for man or machine to determine what exactly happened, in general. Stabilizing interlaced footage will sacrifice a factor of two in vertical resolution.

Best Approach: if at all possible, shoot progressive instead of interlace footage.

This is a good rule whenever you expect to add effects to a shot.

Fallback Approach: stabilize slow-moving interlaced shots as if they were progressive. Stabilize rapidly-moving interlaced shots as interlaced.

To stabilize interlaced shots, SynthEyes stabilizes each sequence of fields independently.

Note that within the image preprocessor subsystem, some animated tracks are animated by the field, and some are animated by the frame.

Frame: Color, color/hue, distortion/scale, ROI

Field: FOV, cut frequency, Delta U/V, Delta Rot, Delta Zoom

When you are animating a frame-animated item on an interlaced shot, if you set a key on one field (say 10), you will see the same key on the other field (say 11). This simplifies the situation, at least on these items, if you change a shot from interlaced to progressive or “yes” mode or back.

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