Finding a Good Reference Pattern
The first step in selecting a good reference pattern is to play the footage several times.
As you review the clip, try to locate a reference pattern that follows as many of the
following rules as possible:
• It contains perpendicular edges, such as dots, intersections, and corners. Lines and
straight boundaries should be avoided as tracking reference patterns.
• It is a high-contrast pattern.
• It contains even changes in brightness or color. An example of an uneven color or
brightness change is a sharp-edged shadow that passes over your reference pattern.
• It appears in every frame of the clip (does not move offscreen or become obscured by
• It is distinct from other patterns in the same neighborhood in the clip.