Original resolution
Landscape, with the complete court or table and player movement area visible.
Field capture guide · version 1.0
Record once. Preserve the play.
A stable original gives a rally index the clearest possible evidence. This guide is the preferred capture profile for badminton, table tennis, and pickleball - not a guaranteed acceptance threshold or a performance promise.
The useful default
One match. One play surface. One fixed camera.
Frames per second
30 fps for badminton and pickleball; 60 fps preferred for table tennis when available.
Camera motion
Rigid mount, no panning, no zooming, no automatic reframing during play.
Private source of record
Keep one untouched camera original privately. Use a separately sanitised transfer copy when the intake plan calls for it.
Existing authorised video is still welcome for assessment. The preferred profile improves input quality; it does not silently reject every recording outside it.
Starting geometry
Elevated, centred, and behind the baseline.
- Place the camera behind one baseline and near the court centreline, on a high tripod, balcony, wall mount, or other rigid support.
- Use roughly 30 degrees of downward tilt as a starting point, then frame for the venue rather than treating that number as calibration.
- Leave margin beyond every court/table edge and above the net. Players should not leave frame during ordinary movement.
- Prefer one active court or table in frame. Adjacent play creates real temporal ambiguity and remains a known hard case.
Sport profiles
Same discipline, sport-specific framing.
| Sport | Preferred frame | Frame rate | Watch for |
|---|---|---|---|
| Badminton | Full single court, baseline-centred, elevated | 30 fps+ | Shuttle contrast, net headroom, adjacent courts |
| Pickleball | Full single court and both baselines | 30 fps+ | Fence/background motion, player cropping |
| Table tennis | Entire table plus both players' movement area | 60 fps preferred | Ball/background contrast, glare, exposure pumping |
These are capture recommendations, not a venue certification or a performance claim. Evaluation results, including tolF1, are available on request with their scope and limitations attached.
Source preservation
Protect the evidence before optimising the file size.
- Resolution
- Record at 1080p or higher. A higher-resolution original preserves detail even if an agreed processing proxy is smaller.
- Container / codec
- Original MP4 with H.264 or HEVC is preferred. Other originals can be qualified; do not re-encode solely to match this sentence.
- Exposure
- Avoid severe backlight, dark halls, blown highlights, and automatic brightness changes. Lock exposure or white balance after a test when the camera supports it and the venue light is stable.
- Focus
- Check the far end during movement. A sharp empty court does not prove players remain sharp in play.
- Audio
- Keep audio enabled and the microphone unobstructed. Public product material does not claim an audio model; preserving audio retains a useful independent review cue.
- Transformations
- Avoid digital zoom, automatic reframing, aggressive stabilisation, beauty filters, overlays, trimming, concatenation, and frame-rate conversion before intake.
- Metadata hygiene
- Preserve the untouched original privately. A pilot transfer copy should minimise GPS, device serials, unique IDs, owner tags, and embedded thumbnails unless the agreed intake requires a field; strip all source metadata from anything published.
Before every session
A sixty-second venue preflight.
- 01Secure the camera.
Clean the lens; check the rigid mount, power, free storage, cable strain, and heat management.
- 02Make a movement test.
Record 20 seconds with players at both near and far ends, including ordinary side movement.
- 03Inspect the far end.
Confirm focus, court/table edges, net headroom, and player margin on the actual recorded file.
- 04Challenge the light.
Look for glare, white-line clipping, dark uniforms disappearing, and brightness changes during movement.
- 05Confirm the original.
Audio is present, the camera clock is reasonable, and a new untouched file will hold the session.
Authority before transfer
Good capture includes a rights plan.
- Record only where you are authorised to record and process the footage.
- Inform adult participants and obtain the permissions required for the intended pilot and outputs.
- Do not submit footage, private share links, credentials, player details, or information about minors through the public form.
- An accepted pilot separately names the source authority, processors, transfer method, retention, deletion, permitted outputs, and served model release before media moves.
- Keep your own original. KhelVision is not the only copy or an archival substitute.
The marketing site accepts no footage. Describe the workflow first; secure intake is designed only after fit and rights are established.
Already recorded?
Do not throw away imperfect originals.
An assisted pilot can qualify one representative original and report the limitations. In the request, describe the sport, original resolution and frame rate, camera position, whether more than one court or table is visible, approximate duration, and intended result. Do not put a file or private URL in the form.