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Microsoft Office PowerPoint
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Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24
PptxGenJS
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PptxGenJS Presentation
PptxGenJS Presentation
PptxGenJS
PptxGenJS
1
2026-08-17T17:31:14Z
2026-08-17T17:31:14Z
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FINAL REVIEW1/2 Lens VARAffordable instant-replay for football pitches — built for Riyadh.The system, the AI results, the button decision, cost and next steps.Final review · 17 August 2026PK
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Final review of 1/2 Lens VAR: what it is, what is built and live, how the AI performed, the button we chose, cost, risks and next steps.1PK
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THE PRODUCTPress a button. Watch the last 30 seconds. 1A camera films the pitchOne wide camera keeps a constant rolling 30-second buffer of play. 2A player presses the buttonA button by the goal saves the last 30 seconds instantly. 3Watch & shareIt plays on their phone in seconds, with a shareable link.Instant replay needs no AI — it runs on-site on affordable hardware and works today.PK
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The core product is simple: a rolling 30-second buffer, a button, and instant playback on a phone. Already running.2PK
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STATUSWhere the project stands today App LIVE 24/7Deployed to a free Oracle cloud VM (in-Kingdom). Runs with no laptop. AI ball detectionFrom 0% at a bad angle to 72% on a real match after tuning. Button chosenA weatherproof metal button + the trigger code, both ready. Setup priced2-camera / 2-button field fully costed with buy links.A working product online, an honest read on the AI, and a hardware plan ready to buy.PK
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Four pillars: live app, field-tested AI, chosen button, costed setup.3PK
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CAMERASThe right camera — one rule to remember DS-2CD… = IP camera ✓• Gives an RTSP video stream the app can read• Runs over one network cable (PoE)• This is the family we buy DS-2CE… = analog ✗• Old coax/DVR type — looks similar in the box• No RTSP stream — the app cannot use it• Avoid, even though it is cheaperPick: 4K Hikvision IP bullet, heat/rain/dust rated (IP66/IP67), for evening play.One letter decides it: CD works, CE does not.PK
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The single most useful rule at the store: DS-2CD is the IP camera we want; DS-2CE is analog and cannot stream to the app.4PK
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THE AIBall detection: from unusable to 72%0%Low cornerangle49%GoPro clip(raw)72%After left-crop+ fixes What the numbers meanAt a low corner angle the ball is hidden behind players — the AI saw it almost never.A cleaner clip took it to 49%. Cropping the sideline and fixing the model pushed it to 72% — nearly 3 of every 4 frames.Camera height and angle matter more than the model — a high, central mount is the fix.PK
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The detection story: bad angle ~0%, decent clip 49%, and 72% after cropping distractions and fixing the class filter. The lesson is that mounting position drives accuracy.5PK
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WHAT CHANGEDThree fixes that raised accuracy 1Cropped the sidelineCut the left edge (the fence net) out of frame so the follow-cam stops locking onto distractions instead of the ball. 2Fixed the modelStopped it counting "baseball bat" and "baseball glove" as a ball — a real source of false hits. 3Ignore anything stillIf a spot does not move for a few seconds it is not the ball (a cone, a bag, a light) and is dropped.Same footage, +23 points — before spending anything on new hardware.PK
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Three concrete, no-cost software changes lifted detection from 49% to 72%.6PK
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THE BUTTONIt is just a button — here is the chain 1Player pressesA weatherproof button by the goal.→ 2Signal to the mini-PCOver a cable, Wi-Fi, or a radio receiver.→ 3App saves 30sIt cuts the last 30 seconds from the buffer.→ 4Clip on the phonePlays in seconds, with a share link.The button has no camera and no screen. The camera you already have does the filming.A small trigger script (written and saved) turns the press into a saved clip.PK
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The button is only a trigger. A small listener script already written converts a press into a call to the app's replay endpoint.7PK
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OPTIONSFour ways to trigger a clip RF doorbell buttonWeatherproof radio button + one USB receiver. Cheapest, long range.~90–160 SAR / 2 Wi-Fi button (Shelly)Sends the request straight to the app over Wi-Fi. Clean, no receiver.~190–240 SAR / 2 Flic BluetoothThe polished padel-style button. Needs a small hub.~500–600 SAR Wired metal buttonA physical switch on a cable — the most reliable, our pick.~120–160 SAR / 2All four work with the app. The choice is weatherproofing, range and feel.PK
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Four trigger options, all compatible. Trade-offs are cost, range and weatherproofing.8PK
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THE BUTTONThe button — two options FOR TESTING100 mm USB dome• Plugs straight into USB — no board, no wiring• Big smack dome · momentary microswitch• Works with the trigger script as-is• Indoor · 2 m cable — perfect for a demo≈ 80 SAR FOR THE PITCHAPIELE 22 mm mushroom (sealed)IP65 weatherproof metal — heat, dust, rain.
Momentary — two wires to a small board.
For the permanent outdoor install.
About 40 SAR on Amazon.sa.≈ 40 SARAmazon.sa · APIELE mushroom (B09KZK8SXQ)Test with the plug-and-play USB dome; switch to the sealed mushroom outdoors.PK
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Two buttons: for testing, a 100mm USB dome that plugs straight in (no board) and works with the trigger script; for the permanent outdoor install, the sealed IP65 APIELE 22mm mushroom wired via a small board.9PK
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THE BRAINThe always-on computer HPHP ProDesk 600 G1Desktop Mini (refurbished)• Intel Core i5-4590T · 8GB RAM · 500GB• Tiny, low-power — built to run 24/7• 2-year warranty (buys peace of mind)• Runs the same app you already deployed Why this boxOnly needed for 24/7 — the laptop proves the prototype first.
Plenty of power for the video + 30s buffer.
Cheap & available — a fraction of a new mini-PC.
Tip: add an SSD (~120 SAR) later for speed.≈ 540 SARAmazon.sa · HP ProDesk 600 G1 DM (refurbished)A ~540 SAR refurbished HP mini — only for the permanent 24/7 install.PK
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The 24/7 box: a refurbished HP ProDesk 600 G1 DM (i5-4590T, 8GB, 500GB, 2-yr warranty) for about 540 SAR on Amazon.sa. Only needed once you leave it running unattended; the laptop covers the prototype.10PK
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