Kitchen View
What does Kitchen View?s ?At kitchen line? percentage mean?
At kitchen line is the share of a player track?s accepted continuous observation time spent within one meter behind either kitchen line. It is not a percentage of the whole video or a fault decision. Check tracked time, visible feet and player IDs before interpreting it; export the JSON report to keep the underlying seconds.
Read the percentage with tracked time
In Player movement, read At kitchen line beside Tracked time for the same row. The app divides kitchen-line seconds by tracked seconds, multiplies by 100 and rounds to a whole percentage. The denominator belongs to that player track; it is not the video duration or the session?s Analyzed time.
For example, if a track has 30 seconds of accepted continuous observation and 12 of those seconds qualify as near the line, the displayed value is 40%. That arithmetic does not establish what the player did during missing footage. A dash means there is no tracked time available for this calculation, rather than a measured zero percent.
Understand the band behind the line
The page defines At kitchen line as within 1 m behind either kitchen line. The calculation checks the projected position against those two lengthwise bands, including their boundaries. It does not measure contact with the painted line, distinguish individual feet touching it or decide whether a shot was legal.
The tracked position comes from ankle landmarks: the app averages their horizontal image coordinates and uses the lower ankle?s vertical coordinate before projecting onto the calibrated court. Treat this as an estimated ground position. Hidden ankles, airborne feet or a misplaced court corner can change where that estimate lands.
Set up a short observation you can inspect
Choose match video, select Singles or Doubles, and pause on a clear court view. Use Mark court corners to select the four outer corners in order: far left, far right, near right, near left. The calibration canvas accepts arrow keys and Enter; Precise corner coordinates offers percentage fields as another keyboard path. Then choose Start tracking.
Use a steady view with the full court and feet visible. Start with a short passage you can inspect against the footage. If the camera moves, zooms or cuts, export before recalibrating. Recalibration clears measurements after the replacement confirmation. A percentage based on the old perspective should not be carried into a changed view.
Investigate gaps and changes of identity
When the number seems surprising, check Players visible and the row?s Visible, Lost / paused or Not seen state. Both ankle landmarks must pass the confidence gate to produce a position. Accepted observations add tracked time only across qualifying continuous intervals; gaps longer than one second and implausible jumps do not contribute that interval. Unseen movement is not filled in.
IDs follow nearby positions and can swap when players overlap. Renaming Player 1 does not make the matching recognize that person?s identity. Watch the numbered overlay through an overlap before attributing a percentage to a named player. Missing observations can leave the percentage describing only the clearest part of that person?s movement.
Save the seconds and keep comparisons separate
Pause tracking and choose Export report to save kitchen-view-report.json. Each player entry includes trackedSeconds and kitchenLineSeconds, so you can retain the denominator as well as the rounded display. The report also preserves calibration, sampled coordinates and limitations. Results otherwise live in memory and disappear on reload.
For a separate passage, export first and choose Clear analysis; this keeps the court calibration. Simply seeking elsewhere retains earlier totals, so resuming produces a combined analysis rather than a fresh comparison. Replaying a passage with tracking enabled adds observations again. Keep each saved report tied to the passage you deliberately tracked.
AI-assisted ForgeHub editorial. App capabilities were checked against its implementation; this guide is not an independent review.
Frequently asked questions
Does 0% prove the player never approached the kitchen line?
No. The display rounds to a whole percentage, so a small nonzero share can display as 0%. It also covers only accepted tracked intervals; unseen movement is not reconstructed.
Does the percentage cover only manually marked rallies?
No. Rally markers are stored as manual start and end times. The kitchen-line calculation runs on accepted tracking observations and is not filtered to those markers.
Can I explore this without loading match footage?
Yes. Explore a simulated session loads generated positions and calculated totals without a model download. It demonstrates the workflow, but its values are not measurements of a real match.