Apple MA434Z/A User Manual - Page 728
Tracking Shortcut Menu, Strategies for Better Tracking
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Parameter trackNCorrelation trackNWindow Parameters Description The correlation value of that key to the original sample. A score of 1 is a perfect score. 0 is a completely unusable score. These multiple parameters control the windowing of the tracking box, and are not relevant to exported values. Tracking Shortcut Menu Right-click in the text field of a trackName to open a shortcut menu with options for manipulating your tracks. Menu Item Copy/Paste Load Track Link Track Average Tracks Smooth Track Load Track File Save Track File Clear Track Description The standard copy and paste commands. Displays a list of all currently existing tracks. Select one, and a copy of that track is loaded into both the X and Y parameters of the current tracker. Displays a list of all currently existing tracks. A link is made from the current tracker to the tracker you select in the Select Track pop-up window. Therefore, if you modify the tracker selected with the Link command, the current tracker is updated. If you delete the tracker you linked to, you lose your tracking data. Displays a list of all tracks. Select up to four tracks that you want to average together, then click OK. An expression is entered into the current trackX and Y fields that links back to your averaged tracks. You cannot choose to average your current track-it is deleted by this action. Displays a slider to execute a blur function on your tracking curves; the smooth value is the number of keyframes considered in the smoothing operation. To view the curves, open the trackName subtree and click the Load Curve button to load the parameters into the Curve Editor. If you use Smoothing and Averaging operations as your standard workflow, it is recommended that you generate your tracks first with the Tracker node, and then link the tracks to a MatchMove or a Stabilize node. Loads a Shake-formatted track file from disk. See the end of the tracking overview for the format of a track file. Saves a Shake-formatted track file to disk. Resets the current tracker. To reset the entire function, right-click an empty area of the Parameters tab, then choose Reset All Values from the shortcut menu. Strategies for Better Tracking Unfortunately, tracking is rarely a magic bullet that works perfectly on the first attempt. This section discusses some strategies to help you get accurate tracks in various situations. 728 Chapter 25 Image Tracking, Stabilization, and SmoothCam
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