CinePlex v3 Manual - Plexon Inc

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page 262. From the Marker list, select Tail Position. Because we want
coordinates for every frame, in the Timestamp Determination area, click
Use Frame Marker Times. Click OK to close the dialog box and enter the
tracking coordinates.
4.6.6 Repairing Tracking Coordinates
Suppose that CinePlex Studio is used to track an LED mounted to the headstage
on a rat. Occasionally, the cable from the headstage can get between the LED and
the camera, so the position data for the LED is missing in some frames. Or, suppose
something caused the tracker to produce bad coordinates for a few frames,
possibly caused by some light leaking into the experimental setup that confused
the tracking algorithms.
In either case, the procedural approach is to put CinePlex Editor into a state
where the video is advanced frame-by-frame and enter new or replacement
tracker coordinates by clicking in the Video window at the desired location.
Repairing tracking coordinates
1 In the Markers window, select the Coordinates marker to repair. Click Show.
To minimize confusion during the procedure, clear Show for other Coordinate
markers (if present).
2 For the following procedure to work, the Coordinates markers must be aligned
to the Frame marker times by using the Snap-to Marker Occurrences dialog
box, for more information, see “Snap-To Marker Occurrences” on
page 193. Follow the procedure outlined in that section to align the
Coordinate markers to the Frame markers.
3 Locate a section of time that has bad or missing values for the selected
Coordinate marker that needs to be repaired. Pause the playback at the first
frame with bad or missing coordinates.
4 From the Tools menu, click Options, and in the Options dialog box click the
General tab. Make sure that the the selection in the Number of Frames to
Advance During Click-To-Add box is 1 (the default). Also, from the Animate
menu, select Lock To Video Frames.
5 In the Input window, at Left-Click, click Insert. This “arms” CinePlex Editor
to enter new (or replace existing) marker occurrences when clicking the left
mouse button in the Video window.
6 Position the mouse cursor where the new (or replacement) coordinate needs
to be and click.
The position is entered (or updated) and the video automatically advances by
one frame.
206 CinePlex