main.py

#OpenCV for image processing functions
import cv2
# Numpy for array related functions
import numpy as np
# Dlib for face landmark detection
import dlib
#face_utils for basic operations of conversion
from imutils import face_utils
#playsound for playing alarm sound
from playsound import playsound

#Initializing the camera and taking the instance
cap = cv2.VideoCapture(0)

#Initializing the face detector and landmark detector
detector = dlib.get_frontal_face_detector()
predictor = dlib.shape_predictor("shape_predictor_68_face_landmarks.dat")

#status marking for current state
Sleep = 0
Drowsy = 0
Active = 0
status=""
color=(0,0,0)

def compute(ptA,ptB):
	dist = np.linalg.norm(ptA - ptB)
	return dist

def blink(a,b,c,d,e,f):
	up = compute(b,d) + compute(c,e)
	down = compute(a,f)
	ratio = up/(2.0*down)

	#Checking for blink
	if(ratio>0.25):
		return 2
	elif(ratio>0.21 and ratio<=0.25):
		return 1
	else:
		return 0


while True:
    feature, frame = cap.read()
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    faces = detector(gray)
    face_frame=frame.copy()
    #detect face in faces array
    for face in faces:
        x1 = face.left()
        y1 = face.top()
        x2 = face.right()
        y2 = face.bottom()

        cv2.rectangle(face_frame, (x1, y1), (x2, y2), (0, 255, 0), 2)

        landmarks = predictor(gray, face)
        landmarks = face_utils.shape_to_np(landmarks)

        #The numbers are actually the landmarks which will show eye
        left_blink = blink(landmarks[36],landmarks[37], 
        	landmarks[38], landmarks[41], landmarks[40], landmarks[39])
        right_blink = blink(landmarks[42],landmarks[43], 
        	landmarks[44], landmarks[47], landmarks[46], landmarks[45])
        
        #Now judge what to do for the eye blinks
        if(left_blink==0 or right_blink==0):
            Sleep+=1
            Drowsy=0
            Active=0
            if(Sleep>6):
                playsound('alarm.mp3')
                status="SLEEPING ALERT!!!"
                color=(255,0,0)
        elif(left_blink==1 or right_blink==1):
            Drowsy+=1
            Sleep=0
            Active=0
            if(Drowsy>6):
                status="DROWSY"
                color=(0,0,255)
        else:
            Drowsy=0
            Sleep=0
            Active+=1
            if(Active>6):
                status="ACTIVE :)"
                color=(0,255,0)
        	
        cv2.putText(frame, status, (100,100), cv2.FONT_HERSHEY_SIMPLEX, 1.2, color,3)

        for n in range(0,68):
            (x,y)=landmarks[n]
            cv2.circle(face_frame, (x, y), 1, (255, 255, 255), -1)

    cv2.imshow("Frame",frame)
    cv2.imshow("Result of detector",face_frame)
    key=cv2.waitKey(1)
    if(key==27):
      	break