face_and_mouth_detection.py

import numpy as np
import cv2
import random
# multiple cascades: https://github.com/karan19100/Face-Mask-Detection-using-Open-CV-/tree/main/data/xml
face_cascade = cv2.CascadeClassifier('data\\xml\\haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('data\\xml\\haarcascade_eye.xml')
mouth_cascade = cv2.CascadeClassifier('data\\xml\\haarcascade_mcs_mouth.xml')
upper_body = cv2.CascadeClassifier('data\\xml\\haarcascade_upperbody.xml')


# Adjust threshold value in range 80 to 105 based on your light.
bw_threshold = 80
# User message
font = cv2.FONT_HERSHEY_SIMPLEX
org = (30, 30)
weared_mask_font_color = (255, 255, 255)
not_weared_mask_font_color = (0, 0, 255)
thickness = 2
font_scale = 1
weared_mask = "Thank You for wearing MASK"
not_weared_mask = "Please wear MASK to defeat Corona"
cap = cv2.VideoCapture(0)
while 1:
 # Get individual frame
 ret, img = cap.read()
 img = cv2.flip(img,1)
 # Convert Image into gray
 gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
 # Convert image in black and white
 (thresh, black_and_white) = cv2.threshold(gray, bw_threshold, 255, cv2.THRESH_BINARY)
 cv2.imshow('black_and_white', black_and_white)
 # detect face
 faces = face_cascade.detectMultiScale(gray, 1.1, 4)
 # Face prediction for black and white
 faces_bw = face_cascade.detectMultiScale(black_and_white, 1.1, 4)


 if(len(faces) == 0 and len(faces_bw) == 0):
 cv2.putText(img, "No face found...", org, font, font_scale, weared_mask_font_color, thickness, cv2.LINE_AA)
 elif(len(faces) == 0 and len(faces_bw) == 1):
 # It has been observed that for white mask covering mouth, with gray image face prediction is not happening
 cv2.putText(img, weared_mask, org, font, font_scale, weared_mask_font_color, thickness, cv2.LINE_AA)
 else:
 # Draw rectangle on gace
 for (x, y, w, h) in faces:
 cv2.rectangle(img, (x, y), (x + w, y + h), (255, 255, 255), 2)
 roi_gray = gray[y:y + h, x:x + w]
 roi_color = img[y:y + h, x:x + w]


 # Detect lips counters
 mouth_rects = mouth_cascade.detectMultiScale(gray, 1.5, 5)