From the course: After Effects Apprentice: 12 Tracking and Keying

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Tracking interlaced sources

Tracking interlaced sources - After Effects Tutorial

From the course: After Effects Apprentice: 12 Tracking and Keying

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Tracking interlaced sources

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Elsewhere in this course I've described this MRI computer footage as being a progressive scan. In other words, not being interlaced or not exhibiting fields. Well, that was a little white lie, but it gives me an opportunity to talk to you about tracking footage that is interlaced. Let's move in time to a point where we have the fast motion in this shot, probably when this woman is coming on screen like right around here. If I Zoom in on this shot and pan over to her, I do indeed to see the telltale comb teeth effect of interlacing. These horizontal lines being slightly offset from each other indicate that this frame contains lines that occurred at two different points in time and therefore are freezing the motion at two different positions. Normally, I would advice separating fields on any interlaced source. However, through experimentation I found that on this particular clip it does not help, and I will explain to you why. I'll go back to 100% Magnification and open up the Interpret…

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