faceRecognizer.py

import cv2
import numpy as np
import time
import sqlite3 as lite
from paths import getHaarcascadePath
from lock import openLock

def faceRecognizer():
    con = lite.connect("users.db")
    recognizer = cv2.face.LBPHFaceRecognizer_create()
    recognizer.read('trainer/trainer.yml')
    cascadePath = getHaarcascadePath()
    faceCascade = cv2.CascadeClassifier(cascadePath);
    font = cv2.FONT_HERSHEY_SIMPLEX
    #iniciate id counter
    id = 0
    # Initialize and start realtime video capture
    cam = cv2.VideoCapture(0)
    cam.set(3, 640) # set video widht
    cam.set(4, 480) # set video height
    # Define min window size to be recognized as a face
    minW = 0.1*cam.get(3)
    minH = 0.1*cam.get(4)
    startTime = time.time()
    while True:
        recogPercent = None
        ret, img = cam.read()
        gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
        faces = faceCascade.detectMultiScale( 
            gray,
            scaleFactor = 1.2,
            minNeighbors = 5,
            minSize = (int(minW), int(minH)),
           )
        for(x,y,w,h) in faces:
            cv2.rectangle(img, (x,y), (x+w,y+h), (0,255,0), 2)
            id, confidence = recognizer.predict(gray[y:y+h,x:x+w])
            # Check if confidence is less them 100 ==> "0" is perfect match 
            if (confidence < 100):
                name = "user"
                with con:
                    cur = con.cursor()
                    cur.execute("SELECT * FROM users WHERE id=:Id", {"Id": id})
                    con.commit()
                    row = cur.fetchone()
                    name = row[1]
                #id = names[id]
                id = name
                recogPercent = round(100 - confidence)
                confidence = "  {0}%".format(round(100 - confidence))
            else:
                id = "unknown"
                confidence = "  {0}%".format(round(100 - confidence))
                
            cv2.putText(img, str(id), (x+5,y-5), font, 1, (255,255,255), 2)
            cv2.putText(img, str(confidence), (x+5,y+h-5), font, 1, (255,255,0), 1)  
        
        cv2.imshow('camera',img)
        if(recogPercent != None and recogPercent > 50):
            openLock()
            break
        if(time.time() - startTime > 30):
            break
        k = cv2.waitKey(10) & 0xff # Press 'ESC' for exiting video
        if k == 27:
            break
    # Do a bit of cleanup
    print("\n [INFO] Exiting Program and cleanup stuff")
    cam.release()
    cv2.destroyAllWindows()