Enhance alert processing in camera stream

- Added debug print statements for camera IP configuration at load time.
- Modified CAMERA_IPS initialization to correctly reference environment variables.
- Adjusted YOLO_CONF value for improved detection sensitivity.
- Refactored alert logic to accumulate pending alerts before saving, allowing for better management of alert metadata and image saving.
- Implemented saving of annotated alerts with unique filenames to prevent collisions.

camera_stream.py

@@ -13,12 +13,18 @@ load_dotenv(override=True)
 
 app = Flask(__name__)
 
+# Load-time debug for camera config (safe to leave; only prints on startup)
+print(
+    "[Surveillance] camera_ip_1=" + str(os.getenv("camera_ip_1")) +
+    " camera_ip_2=" + str(os.getenv("camera_ip_2"))
+)
+
 # ---------------------------------------------------------------------------
 # Configuration
 # ---------------------------------------------------------------------------
 USERNAME = os.getenv("username")
 PASSWORD = os.getenv("password")
-CAMERA_IPS = [os.getenv(f"camera_ip_{i+1}") for i in range(1, 3)]
+CAMERA_IPS = [os.getenv(f"camera_ip_{i}") for i in range(1, 3)]
 CAMERAS = [
     {
         "id": f"cam{i + 1}",
@@ -34,7 +40,7 @@ PROXIMITY_PX = 200        # max pixel distance to consider two people "together"
 GROUP_TIME_THRESHOLD = 20  # seconds before an alert fires
 ALERT_COOLDOWN = 60        # seconds between successive alerts
 MIN_GROUP_SIZE = 2
-YOLO_CONF = 0.5
+YOLO_CONF = 0.25
 INFERENCE_DEVICE = 0
 
 # ---------------------------------------------------------------------------
@@ -249,8 +255,9 @@ def _process_stream():
         for gid in stale:
             del _group_trackers[gid]
 
-        # --- Alert logic ---
+        # --- Alert logic (mark + metadata; save after drawing overlays) ---
         alert_this_frame = False
+        pending_alerts = []  # list of (gid, people_count, duration_seconds)
         for gid, gdata in _group_trackers.items():
             duration = gdata["last_seen"] - gdata["first_seen"]
             if duration >= GROUP_TIME_THRESHOLD and not gdata["alerted"]:
@@ -258,21 +265,7 @@ def _process_stream():
                     gdata["alerted"] = True
                     alert_this_frame = True
                     _last_alert_time = now
-
+                    pending_alerts.append((gid, gdata["member_count"], duration))
-                    os.makedirs("alerts", exist_ok=True)
-                    ts = datetime.now().strftime("%Y%m%d_%H%M%S")
-                    alert_path = f"alerts/alert_{ts}.jpg"
-                    cv2.imwrite(alert_path, frame)
-
-                    alert_info = {
-                        "time": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
-                        "people": gdata["member_count"],
-                        "duration": round(duration, 1),
-                        "image": alert_path,
-                    }
-                    with lock:
-                        state["alerts"].insert(0, alert_info)
-                        state["alerts"] = state["alerts"][:50]
 
         # --- Draw overlays ---
         display = frame.copy()
@@ -308,6 +301,25 @@ def _process_stream():
                     cv2.FONT_HERSHEY_SIMPLEX, 0.8, (0, 0, 255), 3,
                 )
 
+        # --- Save annotated alerts ---
+        if pending_alerts:
+            os.makedirs("alerts", exist_ok=True)
+            ts = datetime.now().strftime("%Y%m%d_%H%M%S")
+            for gid, people, duration in pending_alerts:
+                # Include group id to avoid collisions when multiple groups alert in one second.
+                alert_path = f"alerts/alert_{ts}_gid{gid}.jpg"
+                cv2.imwrite(alert_path, display)
+
+                alert_info = {
+                    "time": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
+                    "people": people,
+                    "duration": round(duration, 1),
+                    "image": alert_path,
+                }
+                with lock:
+                    state["alerts"].insert(0, alert_info)
+                    state["alerts"] = state["alerts"][:50]
+
         # --- Update shared state ---
         groups_json = []
         for gid, gi, gc in frame_group_data: