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Person Reader Recognition Distance Settings Guidance

Here’s a structured guideline for Person Reader recognition distance settings based on geometry and use case:

General Principles​

  • Recognition distance must balance early pipeline start (for speed and responsiveness) with false detection control (avoiding passersby being picked up).
  • Off-angle geometry widens the effective recognition distance (Pythagorean rule applies).
  • Faster approaches (e.g., lobby turnstiles) require longer initial detection range to compensate for motion blur and lower confidence scores.
  • Always tune recognition distances with site geometry, approach speed, and user intent in mind.

1. Turnstiles in Lobby Areas

  • Typical Approach: Fast walking, often at an angle, corridors turning into banks.

  • Challenges: Motion blur, angled entry, crowds walking past nearby.

  • Recommendation:

  • Start recognition at ~6 feet.

  • Longer distance helps pipeline engage earlier.

  • If false detections from side-passers occur, reduce slightly (5-5.5 feet).

  • Prioritize confidence accumulation over instant recognition.

2. Elevator Lobbies (Upper Floors)

  • Typical Approach: Slower, more deliberate; smaller throats, less crowding.

  • Challenges: Less room behind PR, but users have time to align.

  • Recommendation:

  • Recognition at 4-5 feet is optimal.

  • Crowding less likely, so false detect risk is lower.

  • If angle approaches are common (PRs in throats), extend to ~5.5 feet to account for off-angle pickup.

3. Main Lobby without Turnstiles (e.g., 50 California)

  • Typical Approach: Angled walk-up; PRs often in throats.

  • Challenges: 60° off-angle approach means geometric distance > straight-line distance.

  • Recommendation:

  • Effective detection should feel like 5 feet straight-line, even if geometric distance is larger.

  • Allow wider FOV pickup so the system feels responsive.

  • Avoid forcing users to square up directly in front.

4. Doors / Intercom Applications

  • Typical Approach: Intentional walk-up, usually straight on.

  • Challenges: Passersby glancing at device can trigger false detects.

  • Recommendation:

  • Recognition distance of ~4 feet works well.

  • If geometry allows and false detect risk is low, extend to 5 feet for faster response.

  • Prioritize intent over range-better to require a slight step forward than to constantly mis-trigger.

Key Takeaways​

  • Lobby turnstiles: 6 ft (tune down if false detects).
  • Elevator lobbies (upper floors): 4-5 ft, extend to 5.5 ft for angle approaches.
  • Lobby without turnstiles: ~5 ft equivalent, adjusted for off-angle.
  • Doors/intercoms: 4-5 ft, tuned for intent.