Apple MA434Z/A User Manual - Page 727

Parameter failureTolerance failureBehavior limitProcessing preProcess blurAmount trackNName trackNX/Y Description update if below reference tolerance This updates the reference sample from the previous frame if the correlation is below the referenceTolerance. This basically says, "If I can't get a good match, then resample." This is excellent for gradual perspective and scale shifts in the tracking area. If the correlation of a track falls below this value, it initiates the failureBehavior. What occurs when the correlation drops below the failureTolerance: stop The tracker stops if the correlation is less than the failureTolerance. You can also press Esc to manually stop tracking. predict location and create key If a failure is detected, then the tracker predicts the location of the keyframe based on a vector of the last two keyframes, and continues tracking in the new area. predict location and don't create key Same as above, but it merely predicts the new search area and does not create new keyframes until a high correlation is obtained. This is excellent for tracked objects that pass behind foreground objects. don't predict location In this case, the tracker merely sits in the same spot looking for new samples. New keyframes are not created. use existing key to predict location This allows you to manually create keyframes along your track path. You then return to the start frame and start tracking. The search pattern starts looking where the preexisting motion path is. Creates a Domain of Definition (DOD) around the bounding boxes of all active trackers. Only that portion of the image is loaded from disk when tracking, so the track is faster. This has no effect on the final output image. Toggles on the preprocessing for the tracking area. This applies a slight blur to reduce fluctuations due to grain. To control the blur amount, open the preProcess subtree. The amount of blur applied when preprocessing. The name of the track. To change the name, click in the text field and enter the new name. The actual track point in X and Y. Use this to link a parameter to a track point. Chapter 25 Image Tracking, Stabilization, and SmoothCam 727