Tailgating / Anti-Piggyback Deep Guide · Abu Dhabi
A door opens once, two people walk through — only one credential was presented. The deep solution combines an overhead head-count analytic with the access-control swipe event, joined on a precise timestamp, with a graded response: silent log and coaching for a first offence, audible chime for second offence, controller relock for high-security doors. This guide explains the architecture, the failure modes and the genuine performance bounds in real Abu Dhabi sites.
Get a Free QuoteCall +971 55 651 7843
Tailgating detection is a correlation problem, not a single computer-vision task. The reliable architecture is built from three components in series. First, a downward-facing overhead camera mounted directly above the doorway captures a top-down view of the head silhouettes. A camera mounted on the side wall is not suitable because the head-count under occlusion is unreliable. Second, an object-tracking analytic running on the camera NPU or a server VCA counts individual heads as they cross a virtual tripwire drawn across the threshold of the door — typically using a Kalman-filter tracker with IOU-based re-association to handle the brief gap when two heads overlap. The tracker reports a head-count value per door-open event. Third, the access-control system (Suprema BioStar 2, ZKTeco BioSecurity, HID OnGuard, Lenel S2, Honeywell Pro-Watch) emits a swipe event with a precise timestamp when a valid credential is presented. The correlation engine — sometimes inside the access controller, sometimes in the VMS — joins the two streams on a tight time window (usually the door-strike-relay interval, two to five seconds) and computes swipe-count minus head-count. If the difference is negative — more heads crossed than credentials presented — the event is a tailgating violation. The response is graded: a silent log for first offence and coaching, an audible chime at the doorway for a second, and on high-security doors a controller relock that requires re-swipe. The deep-failure modes are: a parent carrying a child (head-count is two but the second head is shorter — we calibrate height thresholds), umbrellas and large hats (the model loses the head — we use multi-frame association), and visitors held in arms (we accept the false positive rather than miss real tailgates). Performance bounds: performance depends on mounting height, lighting and how closely people walk; the false-acceptance rate is measured at commissioning and the IOU threshold and dwell window are tuned then. Honest scope: a CCTV-only analytic without mantraps or turnstiles cannot physically prevent entry — it can only log and alert. For physical prevention see when mantraps and turnstiles are needed. Emirtech is an ADMCC-approved integrator — we hold no manufacturer credential of our own. Related guide: tailgating detection AI. Call +971 55 651 7843 for a doorway walkthrough.
We start at the actual doorway with the security manager. We measure the soffit height (which determines the overhead camera field of view), confirm the access controller model and its event-export capability, and decide whether the correlation logic will live inside the controller, inside the VMS or on a dedicated server. The graded-response policy — silent log, audible chime, controller relock — is agreed per door risk class.
Emirtech is an ADMCC-approved integrator. We procure both CCTV and access-control hardware through authorised UAE distribution. Call +971 55 651 7843 or visit our quotation form for an itemised written proposal.
Where it applies
Corporate office lobbies, for example on Reem Island or in Capital Park, can use tailgating analytics on the lobby door — first-offence is a silent log for the building manager, repeat offences trigger an audible chime.
Higher-security doors at data halls, IT server rooms and pharmacy stockrooms can run the analytic in controller-relock mode — a tailgating event physically requires a re-swipe.
Operating-theatre and sterile-zone doors gain a quiet audit trail that PPE-discipline and access policy were honoured between scheduled cases.
Personnel gates at Mussafah and KIZAD sites can run the analytic on the turnstile bypass door for high-volume shift-change throughput where a turnstile is the primary control.
Common questions
By itself, the analytic logs and alerts — it cannot physically stop a tailgater. Physical prevention requires a mantrap or a turnstile. We are honest about this distinction up front. For the prevention discussion see our guide on when mantraps and turnstiles are needed. The CCTV analytic is the right tool when the policy is detection-and-coaching rather than physical interlock.
The head-count tracker needs an unoccluded top-down view of the heads crossing the threshold. A side-wall camera loses one head behind the other when two people pass close together, and the false-acceptance rate climbs. We measure soffit height during the survey and select a fisheye or wide-rectilinear lens that gives the right field of view for that ceiling.
Suprema BioStar 2, ZKTeco BioSecurity, HID OnGuard, Lenel S2 and Honeywell Pro-Watch are controllers we can integrate. Each exposes a swipe-event stream with a timestamp the correlation engine can join. If your controller does not expose events, the analytic can still log violations on the CCTV side, but the join with the credential record is then manual.
We calibrate height and size thresholds at commissioning. A child carried on an adult is a known false positive — we either accept the over-count and review it as part of the event log, or we suppress events below a height threshold. Large hats and umbrellas are handled by multi-frame association so the tracker does not lose the head between frames.
Call +971 55 651 7843, email [email protected] or submit a brief via the quotation page. We arrange a free doorway walkthrough across Abu Dhabi and Al Ain, measure the soffit, confirm controller event-export capability, and return an itemised written proposal. See also our tailgating detection overview.
Get a free site survey and no-obligation quotation from Abu Dhabi's ADMCC-approved security specialists.
Related Pages
AI perimeter intrusion detection on CCTV across Abu Dhabi villas, yards and estates — ADMCC-approved integrator, tuned analytics. …
AI line-crossing and virtual tripwire CCTV across Abu Dhabi — directional, person/vehicle-classified alerts, ADMCC-approved.
AI abandoned-object and left-baggage detection on CCTV across Abu Dhabi venues — tuned dwell, ADMCC-approved integrator.
AI object-removed asset protection on CCTV across Abu Dhabi galleries, retail and offices — ADMCC-approved integrator.
Talk to Emirtech's engineers — we reply the same working day across Abu Dhabi and Al Ain. CCTV, security, IT, AV and smart-building solutions.
Mon–Sat 8AM–7PM · [email protected] · Since 2018 · ADMCC-approved for security systems