The properties of the segment selected in the segment area, as indicated by its rugged texture, are displayed in the property editor.

The properties of a segment can be adjusted unless is in the processing queue, as indicated by segment's violet color. All changes of property values can be undone.

Properties of the Parameters group determine the tracking algorithm settings. When a segment is created via Segment|New Segment, its properties are set to default values that would be suitable in most cases. When a segment is created by the Segment|New from Active command, the settings are copied from the previously selected segment.

Method of motion determination.

The Fastest method is the fastest indeed and requires no additional parameters. Is is applicable when the frame-to-frame motion is small.

The Fast method allows tracking fast motion without much acceleration. If it fails to solve thr problem, try some of the following methods.

The Normal method is recommended for most cases. But, if the computation time is critical, you can try the Fast method.

The Intensive method is the most time consuming, but sometimes can help when no other method works.

The upper limit on the interframe displacement of tracked pixels. Used only for keyframes, where no velocity estimation exists.

A value of X means that the displacement of the tracked region between a keyframe and its adjacent frames can be as large as X pixels. If the matching radius is too small, no match for the masked region is likely to be found, and the results will be poor.

Maximum change in velocity (acceleration) between consecutive frames (in pixels).

A value of X allows the difference between the predicted and actual displacement to be as large as X pixels. A smaller (but reasonable) value speeds up computation.

Size of square image blocks used for motion tracking.

Use smaller values for masks with curved or narrow parts. Larger blocks are processed somewhat faster but might yield to less accurate results.

A parametric model used to fit the tracked motion. See Motion models for the list of choices.

Mask variability across the segment.

When turned on, the same mask is used to compute motion between all frames. Usually requires the Reference frame pitch value to be decreased.

If switched off, the mask undergoes the estimated motion and a new mask is generated for each frame.

The generation period of reference frames in the segment.

The value of X means that every Xth frame, starting from the keyframe, will be used as a reference frame, and the motion will be estimated between it and the next (X-1) frames (the value of 1 means that every frame will be a reference frame).

The value must be decreased in case of illumination variation. A greater value speeds up computation.