CinePlex v3 Manual - Plexon Inc

5
Note:
— A Coordinates marker named Centroid Position, when VideoTracker is
in Object Contour tracking mode.
— A Scalar marker named Centroid Motion, when the VideoTracker
Motion Measure option is enabled.
In Plexon VideoTracker protocol, if VideoTracker cannot locate the object being
tracked it reports the positions for those frames as (0,0); for example, if a headstage
cable occluded the LED for a frame VideoTracker reports that frame as
“0,0”. When CinePlex Editor translates strobed events into Coordinates marker
occurrences, it automatically ignores any (0,0) coordinates, which leaves gaps
where there is no position data. The Interpolate Missing Occurrences tool can
fill these gaps, see “Interpolate Missing Occurrences” on page 262.
Note:
Important: Spike waveforms and timestamps and continuous data from a PLX
file are not converted into markers.
5.5.3 Reading NeuroExplorer (NEX) Files
When CinePlex Editor reads a NEX file during the initial project file creation, it
ignores the spike timestamps and continuous data. CinePlex Editor converts other
NEX variables into CinePlex markers as follows:
• Event variables become Time-Only markers, unless the event variable has the
exact name Frame Marker, in which case it becomes a Frame marker.
• NEX interval variables become interval markers.
• NEX marker variables that have one associated value become Scalar markers.
• NEX marker variables that have two associated values become Coordinates
markers.
• CinePlex Editor ignores NEX marker variables with more than two associated
values, and NEX population vector variables.
5.5.4 Reading Digital VideoTracker (DVT) Files
When CinePlex Editor reads a DVT file produced by CinePlex Studio during the
initial project file creation, it always creates Frame marker occurrences. CinePlex
Editor also produces Coordinates and Scalar markers for the coordinate and centroid
motion data streams in the file, in a manner analogous to how it translates
the strobed values into markers in a PLX file.
After creating the initial project, one may import additional markers from additional
data files into the project; see Import Markers on page 5-239. The import
operation also follows the preceding rules.
5.5.5 Non-Typical Initial File Creation
The normal operating mode for CinePlex Editor is to use an AVI file captured
with CinePlex Studio so that frame timestamps are embedded in the AVI file;
276 CinePlex