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Line calling: cameras decide, the lamp shows

The biggest argument in padel is whether the ball touched the floor before hitting the glass. The court cameras follow the ball and, if it hit the opponent's glass or fence without a bounce, light a lamp next to the court. The out replay is on the terminal right away — from the camera that sees the spot, with court sound.

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Court 4, a real match at half speed: the ball line and bounce points computed in 3D by the ball cameras; faces blurred

What it is and why

In padel the ball must first touch the floor on the opponent's side — only then may it bounce into the glass. If the ball hits the opponent's glass or fence directly, without a bounce, it is out: the hitter loses the point. It all happens in a split second, at the glass, often behind the players — which is why this is argued about most.

An AI Padel smart court settles it with cameras. The lamp lights only when the system is confident; doubtful cases are logged “for review” without the lamp, so the game is not stopped by a false signal.

Every out can be reviewed: the court terminal and the club admin panel have a replay from the right camera, and the club marks it “correct” or “wrong”. Accuracy is counted from these marks.

What it does

Line calling

Out — the ball hit the opponent's glass or fence without a floor bounce: the most argued call
A lamp at the court, visible from anywhere on the court
The lamp lights only on a confident call; doubtful cases go “for review”, without the lamp
If the rally continued, the lamp stays off — a false out is cancelled
An out replay from the camera that sees the spot, with court sound
The club marks calls “correct” / “wrong” — this is how accuracy is measured and grows

What the court needs

An AI Padel smart court with ball cameras and a lamp at the court: a TP-Link Tapo smart plug, a relay in the club network (for example Shelly) or a USB relay. Optional piezo sensors on the back glass.

How it works

The cameras follow the ball
Ball cameras build the ball's path in 3D: the shot, floor bounces, touching the glass or the fence.
Checking for a bounce
When the ball touches the glass or fence on the opponent's side, the court server checks whether it bounced off the floor first. Optionally, piezo sensors on the back glass catch the exact moment the ball hits it.
How confident
If only one camera saw the spot or the bounce may have been missed, the call goes “for review”: no lamp, the out stays in the log for review.
Confirmed by play
Before lighting the lamp, the system watches for about two seconds whether the rally continued. If the opponent returned the ball and play went on, the out is cancelled.
The lamp
The court lamp lights about 2–2.5 seconds after the ball hits the glass — visible from anywhere on the court.
Replay and review
A few seconds later the terminal has the out replay: 10 seconds before and 4 after, with sound, starting with the camera that sees the spot. In the admin panel the club sees every out of the day and marks it “correct” or “wrong”.
Voice call «Out!»
When the system calls out, the court speakers say «Out!» together with the lamp. The club switches the voice on; in log-only mode the call is written to the log and lamp and voice stay silent.

Court 4, a real match: this is what a court replay looks like — a rally from camera 1, then the same moment from camera 4 at half speed; faces blurred

Court 4, a real session: the ball bounces near the glass — the clip shows its flight line and bounce angle; faces blurred

Court 4, a real match: the ball hits the opponent's glass without a bounce — the cameras call it out and the lamp lights up; then zoomed in; faces blurred

What you will see

Players on court

The court lamp. On the terminal — the out replay: the camera that sees the spot opens first, its button is marked “• out”.

Club in the admin panel

Live outs: every out of the day — what the cameras decided, who decided, whether the lamp lit, a replay from every camera with sound and the flight analysis — how the ball flew to the glass and whether it bounced. “Correct” / “wrong” buttons and accuracy by marks.

Coach or referee

Match review: outs on the match timeline, the video zooms in on the ball and slows down, a red ring marks the spot, “Yes, out” / “No, ball in” buttons and “Next unchecked out”.

Limits, honestly

At the near end the ball cameras hang above the glass and see the floor right in front of it worse, and a player may hide the ball. So some calls there go “for review” without the lamp.
The lamp is not instant: about 2–2.5 seconds after the hit, and up to 4–5 seconds if play continued for a moment. That is the price of protection from false signals.
If the cameras missed an out, the lamp will not light. Such cases are visible in replays, and a coach or admin corrects the point.
We do not publish an accuracy percentage until it is measured by the club's marks. The target is at least 99 % correct lamps; until then some real outs go “for review” without the lamp.
A club can first switch the signal on without the lamp — log and replays only — and light the lamp once it trusts the accuracy.

Who it helps

Players

Fewer arguments at the glass: the call is visible at once, the replay is on the terminal.

Clubs

Fair play without a referee and an argument for tournaments; every out can be reviewed and checked.

Tournaments

The disputed-ball replay and the match out log support the referee's decision.

API

The same data in your systems through the open API.

GET /v1/cv/match/{match_id} # match events from the cameras: bounces and calls

API documentation →

Questions and answers

What counts as out?

A ball that, after a shot, hit the opponent's glass or fence without touching the floor on their side first. If the ball bounced off the floor first and then hit the glass, play goes on. Playing off your own glass is in, too.

Why doesn't the lamp light at once?

For about two seconds the system checks whether the rally continued. This filters out false outs: if the opponent returned the ball and play went on, the lamp stays off.

It was out, but the lamp didn't light — why?

Most likely the call went “for review”: only one camera saw the spot or the bounce may have been hidden. Such an out is in the log and the replays — it can be watched and marked.

Do we need special balls?

No, regular padel balls.

What do piezo sensors on the glass add?

They catch the exact moment the ball hits the glass. Whether there was a bounce is still decided by the cameras. Sensors are optional: without them the cameras alone make the call.

Which lamp can be connected?

Any lamp through a TP-Link Tapo P100/P110 smart plug, a relay in the club network (for example Shelly) or a USB relay. Everything runs on the club network, without the vendor's cloud.

Can a call be disputed?

Yes. The replay is on the terminal right after the out; in the admin panel the out is marked “wrong”, and a coach or admin corrects the point with a PIN.

Where can I watch the replay?

On the court terminal — right away; in the admin panel — under Live outs and Match review, from every camera and with sound.

How accurate are the out calls?

Accuracy is counted from the club's “correct” / “wrong” marks and shown in the admin panel. We do not promise numbers on the site before acceptance; the target is at least 99 % correct lamps.

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