Python: Multiple Process Running Issue OPENCV & Raspberry Pi -


here's source code playing on raspberry pi 3+ . 

#!/usr/bin/env python  import cv2 import numpy np import time import count_helper imutils.video import videostream sort import * import argparse import configparser import mysqldb import datetime   # creating connection  db = mysqldb.connect(host="localhost",    # host, localhost                      user="root",         # username                      passwd="root",  # password                      db="peoplecount")        # name of data base  # creating cursor cur = db.cursor()   config = configparser.rawconfigparser() config.read('config.cfg')  # full url url_full = '{}/api/peoplecount/'.format(config.get('server', 'url')) parser = argparse.argumentparser() parser.add_argument("--video", type=str) parser.add_argument("--display", type=str) parser.add_argument("--numline", type=str, default="single") args = parser.parse_args() starttime = time.time()  mot_tracker = sort() if args.video == "picam":     c = videostream(usepicamera=1, resolution=(640, 480)).start()     time.sleep(2.0)     f = c.read()     f = cv2.resize(f, (400, 300)) elif args.video == "cam":     c = cv2.videocapture(0)     ret, f = c.read()     f = cv2.resize(f, (400, 300)) else:     c = cv2.videocapture(args.video)     ret, f = c.read()     f = cv2.resize(f, (400, 300))  width = int(f.shape[1]) height = int(f.shape[0]) bgs_mog = cv2.createbackgroundsubtractormog2()  kernelop = np.ones((3, 3), np.uint8) kernelcl = np.ones((11, 11), np.uint8)  y1 = config.getint('line', 'y1') y2 = config.getint('line', 'y2')   entry_disp = 0 exit_disp = 0  while true:     s = time.time()     if args.video == "picam":         f = c.read()     else:         ret, f = c.read()         if not ret:             c.open(args.video)             time.sleep(0.5)             continue     f = cv2.resize(f, (400, 300))     s = time.time()     grey_image = bgs_mog.apply(f)     thresh, im_bw = cv2.threshold(grey_image, 225, 255, cv2.thresh_binary)     im_dl = cv2.morphologyex(im_bw, cv2.morph_open, kernelop)     im_dl = cv2.morphologyex(im_dl, cv2.morph_close, kernelcl)     im_dl, contours, hierarchy = cv2.findcontours(im_dl, cv2.retr_external, cv2.chain_approx_simple)     bboxes = []     centroids = []     cnt in contours:         try:             x, y, w, h = cv2.boundingrect(cnt)             if args.display.lower() == 'true':                 cv2.rectangle(f, (x, y), (x + w, y + h), (255, 0, 0), 2)             bboxes.append([x, y, x + w, y + h, 0.9])         except:             pass     bboxes = np.asarray(bboxes)     track_bbs_ids = mot_tracker.update(bboxes)     if args.display.lower() == 'true':         if args.numline.lower() == 'double':             cv2.line(f, (0, y1), (400, y1), (0, 0, 255), 2)             cv2.line(f, (0, y2), (400, y2), (255, 0, 0), 2)         else:             cv2.line(f, (0, y1), (400, y1), (0, 0, 255), 2)          ids in track_bbs_ids:             cv2.puttext(f, str(int(ids[4])), (int(ids[2]), int(ids[1])),                         cv2.font_hershey_simplex, 1, (255, 255, 255), 1)      if args.numline.lower() == 'double':         exit, entry = count_helper.counting_doubleline(y1, y2, track_bbs_ids)     else:         exit, entry = count_helper.counting_singleline(y1, track_bbs_ids)      if entry > 0 or exit > 0:         # write db here         camera_id = config.get('server', 'camera')         store_id = config.get('server', 'store')         profile_id = config.get('server', 'profile')         recorded_time = datetime.datetime.now().strftime('%y-%m-%d %h:%m:%s')         query = "insert pc(timestamp, people_count_entry, people_count_exit, status, store_id, profile_id, camera_id) values('%s', %d, %d, %d, %s, %s, %s)" % (recorded_time, entry, exit, 0, store_id, profile_id, camera_id)  # noqa         try:             cur.execute(query)             db.commit()         except:             print "check entry"          entry_disp += entry         exit_disp += exit      if args.display.lower() == 'true':         cv2.puttext(f, 'entry:' + str(entry_disp) + ', exit:' + str(exit_disp),                     (20, 20), cv2.font_hershey_simplex, 1, (255, 255, 255), 2)         cv2.imshow('output', f)         k = cv2.waitkey(1)         if k == 27:             break  cv2.destroyallwindows() c.release() enter code here

i have named file counting-sort.py , registered service in /etc/systemd/system/detection.service.

problem when do

sudo service detection start can see multiple instance of script being evoked. output when htop on pi machine. htop output can me why happening? due internal threading of opencv bindings python?

thanks in advance.

edit :

here's pstree -a output :

```

├─python counting-sort.py --display false --video picam   │   ├─{hcec notify}   │   ├─{hdispmanx notif}   │   ├─{htv notify}   │   ├─{vchiq completio}   │   ├─14*[{python}]   │   ├─{vc.null_sink}   │   ├─{vc.ril.camera}   │   └─{vc.ril.video_sp} ```


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