19. BALL & RACQUETChecked on computer-drawn athletes only

Jazz Youth Basketball Assessment

A youth basketball assessment. No public instructions exist for it, so this entry is a placeholder until the assessment is defined.

How far has this tool been checked?

The measurements were checked against computer-drawn athletes whose true answers are known exactly. That shows the arithmetic and the event rules are right under clean, controlled conditions. It does not measure how well the body-tracking model sees real people (water, loose clothing, crouching, fast limbs) and has not been compared with a lab or a coach’s stopwatch. Treat the numbers as an aid, and use the confidence label beside each value.

Where the camera goes

Seen from above. Angles are measured round from the front of the athlete; 90° is square-on from the side. Reference line: direction of movement.

Side view (default, unconfirmed). Placeholder: no public camera setup exists.

Optional extra view

How high, and how it should sit

Our guidance

Framing

Whole body in frame.

The 70–90% band is our own guidance. No published source gives a camera distance in metres, so use it as a starting point and adjust until the whole movement fits.

Ready to record?

Tick each item as you set it up. This is a reminder, not a lock.

Fix the camera on a tripod or stable support and keep it level with the horizon.
Camera height: Not specified. Default: about hip height.
Frame rate 60 fps or higher; resolution: 1080p recommended.
Use the 1x lens with no digital zoom. Avoid ultra-wide and fisheye lenses.
Bright, even light with a plain background that contrasts with the athlete.
Framing: Whole body in frame.
One clean attempt or short set per clip, with the athlete still and fully in frame at the start.
If you film in slow motion, enter the RECORDED frame rate (for example 120 or 240), not the playback rate, so times and speeds are right.
Keep camera position, height and settings the same from session to session so results can be compared.

0 of 9 ready

All the camera settings

Every setting shows where it came from.

Camera height: Not specified. Default: about hip height.; Our guidance
Distance: No published distance exists. Stand back until the whole athlete fits with a small margin, so the athlete fills roughly 70-90% of the frame height. Use the 1x lens and move your feet, not the zoom.; Our guidance
Frame rate: 60+ fps. Not specified. Our default.; From published guidance
Resolution: 1080p recommended; From published guidance
Orientation: Landscape or portrait both work.; From published guidance
Lens and zoom: Use the 1x lens with no digital zoom. Avoid ultra-wide and fisheye lenses.; From published guidance
Lighting: Bright, even light with a plain background that contrasts with the athlete.; From published guidance
Stability: Tripod or fixed support, level with the horizon.; From published guidance
Calibration: No calibration is needed for angles. Distances and speeds need a scale (see Calibration).; From published guidance

Before you start

To be written once the assessment (drills, scoring, age bands) is defined by the programme owner.

Safety

Youth athletes: use only with parent or guardian consent and follow the programme’s safeguarding rules.

Cues for the athlete

Plain coaching cues, one thing at a time.

No cues are published for this tool.

Why camera position matters

Research behind these rules.

2D angles are only trustworthy when the limb moves in the plane the camera sees. Camera-side joints are measured more accurately than far-side joints, and timing is only as fine as one frame.