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The Stabilize2D node is designed to remove unwanted camera movement, rotation, and/or scaling from an image sequence. The node requires data from only a single track if you only need to stabilize movement; it requires data from two tracks if you need to stabilize for rotation and/or scaling.
The basic procedure for using Stabilize2D is to first use the Tracker node to generate the required tracks, then follow the Tracker node with a Stabilize2D node. To this node, you apply the tracking data in inverse form, thus negating the unwanted transformations.