With motion tracking you can track the movement of an object in the original footage and then apply the tracking data for another object - a layer or an effect control point. This tech-nic is supposed, for example, to enhance the shot dynamics or correct a mistake in footage. It allows to create compositions combining elements filmed separate in which images and effects follow the motion.
After effects uses point tracking:
1. One-point tracking uses small area to record a position data (only one point to track).
2. Two-point tracking uses two reference patterns to track. It records position, scale, and rotation data
3. Four-point tracking or Corner uses four reference patterns to track. Commonly used for picture frames or TV screens.
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Multiple-point tracing allows you to track as many reference points as you like. It analyzes the relationship between reference patterns to record position, scale, and rotation data. You can manually add trackers within the Analyze Motion and Sta-bilize behaviors.
However After Effects is helpful in some scenarios (which will be explained in next page), for many tracking tasks it is preferably to use mocha for After Effects (mocha-AE). It pro-vides superior results with greater convenience than do the native After Effects tracking fea-tures. Mocha is a stand-alone planar tracking application that can export tracking data for use in compositions in After Effects.
Mocha for After Effects.
Mocha doesn't use standard one-point and multiple-point tracking. Instead it uses planar tracking. If AE uses reference points for tracking - mocha for AE uses splines. It allows an accurate track to be achieved in a very short time.
Mocha also allows to adjust the shapes based on motion blur and based on what the camera does to the image (effected by shutter speed etc.).
Differentiate between point and planar