From 85e91f3c2f769c164041a7338d3af332cc834101 Mon Sep 17 00:00:00 2001
From: tian <11429339@qq.com>
Date: Mon, 27 Jul 2026 19:26:58 +0800
Subject: [PATCH] fix: use stranger likelihood (1 - best_sim) as confidence for
 unknown face alarms

---
 plugins/alarm/alarm_node.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/plugins/alarm/alarm_node.cpp b/plugins/alarm/alarm_node.cpp
index aa55853..e93a527 100644
--- a/plugins/alarm/alarm_node.cpp
+++ b/plugins/alarm/alarm_node.cpp
@@ -951,7 +951,8 @@ private:
 
                 Detection d;
                 d.cls_id = -1;
-                d.score = it.best_sim;
+                // Unknown: show stranger likelihood (1 - best_sim). Known: show match confidence (best_sim).
+                d.score = (rule.kind == FaceRule::Kind::Unknown) ? (1.0f - it.best_sim) : it.best_sim;
                 d.bbox = it.bbox;
                 d.track_id = it.person_track_id >= 0 ? it.person_track_id : it.best_person_id;
                 dets.push_back(std::move(d));