Correcting Errors

Updating the Reference Point

If the tracker loses the reference point, you can delete the incorrect keyframes, then, at the last good keyframe, update the reference point to the current contents of the tracker box.

To update the reference point to the tracker box contents:

1. Select the appropriate tracker by clicking the appropriate Tracker button.
2. Press Backspace.

   The last keyframe is deleted and the positioner moves back one frame. The tracker box is now on the previous keyframe.

3. If you want to remove this keyframe, press Backspace again.
4. Repeat step 2 for all incorrect keyframes.
5. When you reach the last good keyframe, click Snap. This updates the reference point from the one originally specified in the reference frame to the image currently inside the tracker box.
6. Click Analyze to continue the tracking process.

Resetting the Reference Box

If you want to use a different reference point, you can reset the reference box.

To reset the reference box:

1. Do one of the following:
   • Click Reset at the bottom of the Reference label portion of the UI.
     

     The reference box size is reset to its default values and it is positioned in the center of the Player window.

   • Type values into the respective value fields and click Enter.

Resetting the Tracker Box

By default, the tracker box stays with the reference box as you position it. Generally, you do not need to move the tracker box separately from the reference box. If you separated the tracker box from the reference box and want to reposition it over the reference box, you can reset the tracker box.

To reset the tracker box:

1. Do one of the following:
   • Under Track, click Reset.
     

     The tracker box size is reset to its default values and it is positioned in the center of the player window.

   • Type values into the respective value fields and press Enter.

To reset the shift values:

1. Do one of the following:
   • Under Shift, click Reset.
     

     The shift values are reset to their default values.

   • Type values into the respective value fields and press Enter.

To reset a tracker:

1. Select the tracker from the File Browser.
2. Click Reset in the Tool Options.
   

   The size and position of the reference box, tracker boxes, and the X and Y Shift values are reset.

Adjusting the Tracker Box

If the Stabilizer cannot find the reference point within the boundaries of the tracker box during analysis, the tracker box strays from the reference point and produces incorrect keyframes. Although you can manually correct these keyframes, it is easier to make the tracker box large enough to accommodate the movement of the reference point. Note that processing time increases as the size of the tracker box increases.

To adjust the size of the tracker box:

1. Stop the analysis by clicking the Analyze Forward button.
2. Press Backspace until you reach the last good frame before the tracker box strayed from the reference point. Adjust the size of the tracker box, so that it is large enough to accommodate the largest frame-to-frame movement of the reference point.
   NoteBackspacing deletes the keyframes as you go back. If you do not delete the keyframes, they will be overwritten when you reanalyze. Backspacing in this instance makes it easier to see the tracking path clearly.
3. Click Analyze Forward to continue the analysis.