Person Reader Recognition Distance Settings Guidance

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.

Recommended Settings by Environment

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.