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Stabilizing
Stabilizing is a powerful process that represents one of the most common uses of the Tracker.
In most tracking the Tracker applies the reference motion to the desired element so that the two are locked. In stabilizing, the Stabilize filter uses the Tracker data to invert the analyzed motion to correct unwanted camera or subject motion.
Use 1-point stabilizing when the positional (location in X and Y) motion you want to eliminate is vertical, horizontal, or both vertical and horizontal.
Use 2-point stabilizing when the motion you want to remove involves scaling and/or rotation. It may also involve vertical and/or horizontal shifts.
With stabilizing the shift values are inverted, for example, (3, -2) would become (-3, 2) before they are applied. This inversion results in an elimination of the motion.
The Stabilize filter uses the Tracker data to move the image so that the reference feature occupies the same position it did in the preceding frame. In other words, the reference feature stays still because the frame is being moved.
The repositioning of the image also introduces a border along one or more edges of the frame, and may involve the temporary loss of some of the image's edge information. You use the mode option in the Stabilize filter to specify how this border is handled.
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