Missing data may result from suboptimal video, camera, or detection settings. Indicators include:
Counts for Missed Samples, Interpolated Samples, and Subject Not Found appear at the bottom of the Detection Settings and Acquisition screens. High values appear in red:
You can also review these values in the Trial List by enabling them via Show/Hide > Variables.
Missed Samples indicate that EthoVision was unable to analyze a frame. This may occur if:
If needed, use Save video and track later during acquisition, then select Track next saved video file afterward:
Enable the DDS checkbox in Acquisition for optimal tracking speed:
Missed Samples from video files typically indicate dropped or poorly encoded frames. Always choose fixed frame rates when converting videos.
When Dropped Frames Correction is enabled, EthoVision will interpolate missed samples:
This is acceptable if interpolation remains below 1%. High values should still be addressed by improving underlying camera or detection performance.
This occurs when EthoVision cannot locate the animal. Causes may include:
Note: Every Missed Sample also generates a Subject Not Found entry.
Note: Interpolation cannot be applied to the very first or last frame, or to asterisks indicating data before trial start.
Track Smoothing averages data using surrounding points and fills in short gaps. Enable this in the Track Smoothing Profile. Effects can be toggled on/off easily:
If a large portion of data is missing or detection is poor, it may be best to retrack the video. See: Redo a trial in EthoVision XT