Drowsiness_Detection.py

from scipy.spatial import distance
from imutils import face_utils
import imutils
import dlib
import cv2
import pygame
from threading import Thread

def eye_aspect_ratio(eye):
	A = distance.euclidean(eye[1], eye[5])
	B = distance.euclidean(eye[2], eye[4])
	C = distance.euclidean(eye[0], eye[3])
	ear = (A + B) / (2.0 * C)
	return ear
def select_alarm(result):
	if result == 1:
		sound_alarm("short_alarm.mp3")
	elif result == 2:
		sound_alarm("nomal_alarm.wav")
	elif result == 3:
		sound_alarm("power_alarm.wav")
	else:
		sound_alarm("short_alarm.mp3")

def sound_alarm(path) :
	pygame.mixer.init()
	pygame.mixer.music.load(path)
	pygame.mixer.music.play()
result = 1
thresh = 0.25
frame_check = 20
detect = dlib.get_frontal_face_detector()
predict = dlib.shape_predictor("shape_predictor_68_face_landmarks.dat")# Dat file is the crux of the code

(lStart, lEnd) = face_utils.FACIAL_LANDMARKS_68_IDXS["left_eye"]
(rStart, rEnd) = face_utils.FACIAL_LANDMARKS_68_IDXS["right_eye"]
cap=cv2.VideoCapture(0)
flag=0
cnt=0
cur_char = -1
prev_char = -1

while True:
	ret, frame=cap.read()
	frame = imutils.resize(frame, width=450)
	gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
	subjects = detect(gray, 0)
	for subject in subjects:
		shape = predict(gray, subject)
		shape = face_utils.shape_to_np(shape)#converting to NumPy Array
		leftEye = shape[lStart:lEnd]
		rightEye = shape[rStart:rEnd]
		leftEAR = eye_aspect_ratio(leftEye)
		rightEAR = eye_aspect_ratio(rightEye)
		ear = (leftEAR + rightEAR) / 2.0
		leftEyeHull = cv2.convexHull(leftEye)
		rightEyeHull = cv2.convexHull(rightEye)
		cv2.drawContours(frame, [leftEyeHull], -1, (0, 255, 0), 1)
		cv2.drawContours(frame, [rightEyeHull], -1, (0, 255, 0), 1)
		c = cv2.waitKey(1)
		if c == 27:
			break
		if c > -1 and c != prev_char:
			cur_char = c
		prev_char = c

		if cur_char == ord('1'):
			result = 1
		elif cur_char == ord('2'):
			result = 2
		elif cur_char == ord('3'):
			result = 3
		else:
			result = 1
		if ear < thresh:
			flag += 1
			print (flag)
			if flag >= frame_check:
				if(cnt==0):
					cnt = 15
					cv2.putText(frame, "ALERT!!", (50, 30), cv2.FONT_HERSHEY_SIMPLEX, 3, (0, 0, 255), 2)
					t = Thread(target = select_alarm, args = (result, ))
					t.deamon = True
					t.start()
					#print ("Drowsy")
				else:
					cnt-=1
		else:
			flag = 0
	cv2.imshow("Frame", frame)
	key = cv2.waitKey(1) & 0xFF
	if key == ord("q"):
		break
cv2.destroyAllWindows()
cap.stop()