face_recognition.py

import cv2
import numpy as np
import os


recognizer = cv2.face.LBPHFaceRecognizer_create()
recognizer.read('trainer/trainer.yml')
cascadePath = "haarcascade_frontalface_default.xml"
faceCascade = cv2.CascadeClassifier(cascadePath)

font = cv2.FONT_HERSHEY_SIMPLEX

id = 0

# add your names after 'None'
names = ['None']

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)

while True:

    ret, img = cam.read()

    # convert to grayscale
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

    # detecting faces
    faces = faceCascade.detectMultiScale(
        gray,
        scaleFactor=1.1,
        minNeighbors=5,
        minSize=(int(minW), int(minH)),
    )

    for(x, y, w, h) in faces:

        # draw rectangle around 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):
            id = names[id]
            confidence = f"  {round(100 - confidence)}%"
        else:
            id = "unknown"
            confidence = f"  {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)

    k = cv2.waitKey(10) & 0xff  # Press 'ESC' for exiting video
    if k == 27:
        break

print("\n [INFO] Exiting Program")
cam.release()
cv2.destroyAllWindows()