CourtVision • Badminton Motion Lab

01 / CAPTURE STATION

Track every step.

Live camera or video upload · body landmarks · body-masked shuttle candidates and projected speed

NO SOURCE

Camera is standing byUse a fixed tripod at the sideline, around 1.5 m high at 45°, then mark the shuttle flight region.

00:00WAITING FOR VIDEO

● PLAYER: OFF ● SHUTTLE: OFF0 FPS

Open camera or load a video to begin. An HTTPS webpage is required for iPhone camera access.

Tracked players

0 / 2

On the latest frame

Tracked frames

LOAD PLAYER AI

Player 1 distance

— m

Calibrate court first

01B / SHUTTLE SPEED LAB

Projected shuttle speed

NOT CALIBRATED

Live projected speed

— km/h

Court-plane estimate

Peak projected speed

— km/h

Unverified highest sample

Image motion

— px/s

Analysis-image coordinates (480/640px)

Experimental speed trendAwaiting continuous shuttle detections

Not measured smash speed. The app estimates motion from provisional tracks, video timing and a flat-court projection. At 45° the altitude and depth of an airborne shuttle are unknown. Shuttle flight is three-dimensional; a single ordinary camera cannot reliably determine real flight speed from this calibration. No km/h appears until the court is calibrated and consecutive samples are plausible.

02 / COURT MAPPING

Player movement map

UNCALIBRATED

Create a court scale

Tap Calibrate, then tap the four visible outside court corners clockwise, starting at the far-left image corner. Use only the ground surface, not overhead shuttle positions.

SINGLES 5.18 × 13.4 m

Player 1

Player 2

Shuttle estimate

03 / DETECTION CONTROLS

Tracking setup

AI OFF

Player body tracking

Recognizes up to two skeletons even when ankles are obscured. Hip-only positions cannot produce court distance.

Player 1 / 2 order

Choose camera-bottom for an end-court view, or left/right for your diagonal sideline view. IDs stay associated as players move.

Player detection status

AI not loaded. Waiting for frames.

0 POSES

Shuttle trajectory detection

Searches small moving candidates only within the flight region and outside detected player movement.

45° camera: flight region

Upper 75% is a starting point. For a diagonal sideline camera, mark the actual overhead flight corridor on the video.

Mark shuttle flight area

Tap button, then tap two opposite corners on the preview around where the shuttle flies. Exclude spectators and court-level hand motion where possible.

Shuttle visibility

Higher sensitivity captures dim or blurred candidates but increases false alarms. Flight paths still need multi-frame confirmation.

Analysis detail

Uses original pixels up to your selected cap; does not artificially upscale low-resolution source footage.

Show shuttle candidates

Magenta = small bright moving objects; gold = accepted provisional shuttle. A dot is not proof of shuttle identity.

Video review · frame-by-frame

Pause uploaded footage, move ±1 source frame. Enter the actual source FPS; 30 for your June 2026 video.

Original source resolution

Load footage to see capture size. Upscaling cannot restore missing shuttle pixels.

NO SOURCE

Shuttle candidate diagnostics

Awaiting video and player AI.

0 CANDIDATES

Exclude hands, arms & racket zone

When player AI is enabled, ignore detected bodies and racket-swing regions. If AI is unavailable, shuttle candidate tracking continues with lower confidence.

Estimate shuttle motion speed

Projected km/h after court mapping; image motion available without a scale

Shuttle scan rate

Try 60 scans/sec for fast motion; actual frames and hardware may be slower

Tap-to-seed shuttle

Pause a video, enable this, then tap the actual shuttle. The tracker favors its nearby path, without treating the tap as a measured location or speed.

Show excluded body zones

Display the red regions where bright hand and body motion is deliberately ignored

Skeleton overlay

Draw body joints and player movement paths

Court type

Used for distance estimates after calibration

04 / SESSION FILES

Review & export

NOT RECORDING

Record your video, then export time-stamped player coordinates, tentative shuttle locations and experimental projected speed samples for analysis.

TRACKING ACCURACY
Player pose tracking is AI-based; players with obscured feet still get an ID, but not estimated distance. Shuttle tracking searches the selected flight region, excludes bodies and requires several consistent small-object observations. It can still miss shuttles or mistake other motion; this is NOT a trained shuttle model. Do not use it as a line-calling or shot-speed system.

05 / COURTSIDE GUIDE

Best recording setup

01. Use the rear camera in landscape, with the full court visible and the phone fixed on a tripod.
02. Bright, even lighting; avoid bright moving backgrounds and spectators.
03. Player AI improves body masking; shuttle candidates remain available without it. Use the marked flight region and sensitivity controls for 45° video.
04. For your sideline 45° camera, choose Diagonal 45° player order and mark the upper-air flight rectangle to avoid hand motion. Press Record, then export video and tracking data.
05. For metre-based footwork and projected shuttle speed, calibrate the four court corners. These projected km/h estimates are not verified smash speeds.
06. Your June 2026 example is 640×360 at 30 FPS; selecting 1280 or 240 in the UI cannot create missing pixels or frames. For new recordings, use native 1080p/120–240 FPS if your camera supports it. The in-browser scan rate is NOT the capture frame rate. The app must show SEARCHING or UNCERTAIN when evidence is inadequate.

iPhone: Host this app over HTTPS. Safari → Share → Add to Home Screen. A standalone downloaded HTML file may not get camera permission.