335 lines
11 KiB
Python
335 lines
11 KiB
Python
import cv2
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import os
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import time
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import threading
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import numpy as np
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from datetime import datetime
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from flask import Flask, Response, render_template, jsonify, send_from_directory
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from dotenv import load_dotenv
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from ultralytics import YOLO
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load_dotenv(override=True)
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app = Flask(__name__)
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# ---------------------------------------------------------------------------
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# Configuration
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# ---------------------------------------------------------------------------
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USERNAME = os.getenv("username")
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PASSWORD = os.getenv("password")
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RTSP_URL = (
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f"rtsp://{USERNAME}:{PASSWORD}@192.168.6.36:554"
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"/cam/realmonitor?channel=1&subtype=0"
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)
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PROXIMITY_PX = 200 # max pixel distance to consider two people "together"
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GROUP_TIME_THRESHOLD = 20 # seconds before an alert fires
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ALERT_COOLDOWN = 60 # seconds between successive alerts
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MIN_GROUP_SIZE = 2
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YOLO_CONF = 0.5
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# ---------------------------------------------------------------------------
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# Shared state (protected by lock)
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# ---------------------------------------------------------------------------
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lock = threading.Lock()
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state = {
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"frame": None,
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"people_count": 0,
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"groups": [],
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"alert_active": False,
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"alerts": [],
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"fps": 0,
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"stream_status": "connecting",
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}
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# ---------------------------------------------------------------------------
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# YOLO model (downloaded on first run)
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# ---------------------------------------------------------------------------
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model = YOLO("yolov8n.pt")
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# Group tracking
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_group_trackers: dict = {}
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_next_group_id = 0
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_last_alert_time = 0.0
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# ---------------------------------------------------------------------------
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# Detection helpers
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# ---------------------------------------------------------------------------
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def _centroids(boxes):
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"""Return list of (cx, cy) from xyxy boxes."""
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return [((b[0] + b[2]) / 2, (b[1] + b[3]) / 2) for b in boxes]
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def _find_groups(centroids, threshold):
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"""BFS clustering — returns list of index-lists with >= MIN_GROUP_SIZE."""
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n = len(centroids)
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if n < MIN_GROUP_SIZE:
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return []
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visited = set()
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groups = []
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for i in range(n):
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if i in visited:
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continue
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cluster = [i]
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visited.add(i)
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queue = [i]
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while queue:
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cur = queue.pop(0)
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for j in range(n):
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if j in visited:
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continue
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dx = centroids[cur][0] - centroids[j][0]
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dy = centroids[cur][1] - centroids[j][1]
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if (dx * dx + dy * dy) ** 0.5 < threshold:
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cluster.append(j)
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visited.add(j)
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queue.append(j)
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if len(cluster) >= MIN_GROUP_SIZE:
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groups.append(cluster)
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return groups
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def _group_centroid(centroids, indices):
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xs = [centroids[i][0] for i in indices]
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ys = [centroids[i][1] for i in indices]
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return (sum(xs) / len(xs), sum(ys) / len(ys))
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# ---------------------------------------------------------------------------
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# Main processing loop (runs in background thread)
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# ---------------------------------------------------------------------------
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def _process_stream():
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global _group_trackers, _next_group_id, _last_alert_time
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cap = cv2.VideoCapture(RTSP_URL)
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if not cap.isOpened():
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with lock:
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state["stream_status"] = "error"
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print(f"[ERROR] Cannot open RTSP stream: {RTSP_URL}")
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return
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with lock:
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state["stream_status"] = "live"
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prev_time = time.time()
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while True:
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ret, frame = cap.read()
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if not ret:
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with lock:
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state["stream_status"] = "reconnecting"
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cap.release()
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time.sleep(2)
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cap = cv2.VideoCapture(RTSP_URL)
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if cap.isOpened():
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with lock:
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state["stream_status"] = "live"
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continue
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now = time.time()
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fps = 1.0 / max(now - prev_time, 1e-6)
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prev_time = now
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# --- YOLO inference (person = class 0) ---
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results = model(frame, classes=[0], verbose=False, conf=YOLO_CONF)
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person_boxes = []
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for r in results:
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for box in r.boxes:
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x1, y1, x2, y2 = box.xyxy[0].cpu().numpy()
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conf = float(box.conf[0])
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person_boxes.append((float(x1), float(y1), float(x2), float(y2), conf))
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centroids = _centroids([(b[0], b[1], b[2], b[3]) for b in person_boxes])
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current_groups = _find_groups(centroids, PROXIMITY_PX)
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# --- Match current groups to tracked groups ---
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matched_ids: set = set()
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frame_group_data = []
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for grp_indices in current_groups:
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gc = _group_centroid(centroids, grp_indices)
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best_id, best_dist = None, float("inf")
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for gid, gdata in _group_trackers.items():
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if gid in matched_ids:
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continue
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dx = gc[0] - gdata["centroid"][0]
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dy = gc[1] - gdata["centroid"][1]
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dist = (dx * dx + dy * dy) ** 0.5
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if dist < PROXIMITY_PX * 2 and dist < best_dist:
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best_dist = dist
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best_id = gid
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if best_id is not None:
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_group_trackers[best_id]["centroid"] = gc
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_group_trackers[best_id]["last_seen"] = now
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_group_trackers[best_id]["member_count"] = len(grp_indices)
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matched_ids.add(best_id)
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frame_group_data.append((best_id, grp_indices, gc))
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else:
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gid = _next_group_id
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_next_group_id += 1
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_group_trackers[gid] = {
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"centroid": gc,
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"first_seen": now,
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"last_seen": now,
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"member_count": len(grp_indices),
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"alerted": False,
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}
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frame_group_data.append((gid, grp_indices, gc))
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# Remove stale groups (not seen for > 3 s)
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stale = [gid for gid, gd in _group_trackers.items() if now - gd["last_seen"] > 3]
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for gid in stale:
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del _group_trackers[gid]
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# --- Alert logic ---
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alert_this_frame = False
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for gid, gdata in _group_trackers.items():
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duration = gdata["last_seen"] - gdata["first_seen"]
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if duration >= GROUP_TIME_THRESHOLD and not gdata["alerted"]:
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if now - _last_alert_time >= ALERT_COOLDOWN:
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gdata["alerted"] = True
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alert_this_frame = True
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_last_alert_time = now
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os.makedirs("alerts", exist_ok=True)
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ts = datetime.now().strftime("%Y%m%d_%H%M%S")
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alert_path = f"alerts/alert_{ts}.jpg"
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cv2.imwrite(alert_path, frame)
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alert_info = {
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"time": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
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"people": gdata["member_count"],
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"duration": round(duration, 1),
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"image": alert_path,
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}
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with lock:
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state["alerts"].insert(0, alert_info)
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state["alerts"] = state["alerts"][:50]
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# --- Draw overlays ---
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display = frame.copy()
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for x1, y1, x2, y2, conf in person_boxes:
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cv2.rectangle(display, (int(x1), int(y1)), (int(x2), int(y2)), (0, 255, 0), 2)
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cv2.putText(
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display, f"{conf:.0%}",
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(int(x1), int(y1) - 6),
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cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0), 2,
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)
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for gid, grp_indices, gc in frame_group_data:
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gdata = _group_trackers.get(gid)
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if gdata is None:
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continue
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duration = gdata["last_seen"] - gdata["first_seen"]
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radius = int(PROXIMITY_PX * 0.6)
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is_alert = duration >= GROUP_TIME_THRESHOLD
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color = (0, 0, 255) if is_alert else (0, 165, 255)
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cv2.circle(display, (int(gc[0]), int(gc[1])), radius, color, 2)
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label = f"Group: {len(grp_indices)} | {duration:.0f}s"
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cv2.putText(
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display, label,
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(int(gc[0]) - 70, int(gc[1]) - radius - 10),
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cv2.FONT_HERSHEY_SIMPLEX, 0.55, color, 2,
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)
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if is_alert:
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cv2.putText(
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display, "ALERT",
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(int(gc[0]) - 35, int(gc[1]) + radius + 25),
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cv2.FONT_HERSHEY_SIMPLEX, 0.8, (0, 0, 255), 3,
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)
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# --- Update shared state ---
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groups_json = []
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for gid, gi, gc in frame_group_data:
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gdata = _group_trackers.get(gid)
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if gdata:
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groups_json.append({
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"id": gid,
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"count": len(gi),
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"duration": round(gdata["last_seen"] - gdata["first_seen"], 1),
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})
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with lock:
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state["frame"] = display
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state["people_count"] = len(person_boxes)
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state["groups"] = groups_json
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state["alert_active"] = alert_this_frame or any(
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(gd["last_seen"] - gd["first_seen"]) >= GROUP_TIME_THRESHOLD
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for gd in _group_trackers.values()
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)
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state["fps"] = round(fps, 1)
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# ---------------------------------------------------------------------------
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# MJPEG generator
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# ---------------------------------------------------------------------------
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def _generate_frames():
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while True:
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with lock:
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frame = state["frame"]
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if frame is not None:
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ok, buf = cv2.imencode(".jpg", frame, [cv2.IMWRITE_JPEG_QUALITY, 80])
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if ok:
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yield (
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b"--frame\r\n"
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b"Content-Type: image/jpeg\r\n\r\n" + buf.tobytes() + b"\r\n"
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)
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time.sleep(0.033)
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# ---------------------------------------------------------------------------
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# Routes
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# ---------------------------------------------------------------------------
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@app.route("/")
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def dashboard():
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return render_template("dashboard.html")
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@app.route("/video_feed")
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def video_feed():
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return Response(
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_generate_frames(),
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mimetype="multipart/x-mixed-replace; boundary=frame",
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)
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@app.route("/api/status")
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def api_status():
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with lock:
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return jsonify({
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"people_count": state["people_count"],
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"groups": state["groups"],
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"alert_active": state["alert_active"],
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"alerts": state["alerts"][:20],
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"fps": state["fps"],
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"stream_status": state["stream_status"],
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})
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@app.route("/alerts/<path:filename>")
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def serve_alert_image(filename):
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return send_from_directory("alerts", filename)
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# ---------------------------------------------------------------------------
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# Entry point
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# ---------------------------------------------------------------------------
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if __name__ == "__main__":
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threading.Thread(target=_process_stream, daemon=True).start()
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print(f"\n Surveillance Dashboard → http://localhost:5000\n")
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app.run(host="0.0.0.0", port=5000, debug=False, threaded=True)
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