detect_blinks.py

from scipy.spatial import distance as dist
from imutils.video import FileVideoStream
from imutils.video import VideoStream
from imutils import face_utils
import numpy as np
import argparse
import imutils
import time
import dlib
import cv2

def eye_aspect_ratio(eye):
	A = dist.euclidean(eye[1], eye[5])
	B = dist.euclidean(eye[2], eye[4])
	C = dist.euclidean(eye[0], eye[3])

	ear = (A + B) / (2.0 * C)
	return ear
 
ap = argparse.ArgumentParser()
ap.add_argument("-p", "--shape-predictor", required=True,
	help="path to facial landmark predictor")
ap.add_argument("-v", "--video", type=str, default="",
	help="path to input video file")
args = vars(ap.parse_args())
 
EYE_AR_THRESH = 0.3
EYE_AR_CONSEC_FRAMES = 3

COUNTER = 0
TOTAL = 0

print("[INFO] loading facial landmark predictor...")
detector = dlib.get_frontal_face_detector()
predictor = dlib.shape_predictor(args["shape_predictor"])

(lStart, lEnd) = face_utils.FACIAL_LANDMARKS_IDXS["left_eye"]
(rStart, rEnd) = face_utils.FACIAL_LANDMARKS_IDXS["right_eye"]

print("[INFO] starting video stream thread...")
vs = FileVideoStream(args["video"]).start()
fileStream = True
vs = VideoStream(src=0).start()
fileStream = False
time.sleep(1.0)

while True:
	if fileStream and not vs.more():
		break

	frame = vs.read()
	frame = imutils.resize(frame, width=450)
	gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

	rects = detector(gray, 0)

	for rect in rects:
		shape = predictor(gray, rect)
		shape = face_utils.shape_to_np(shape)

		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)

		if ear < EYE_AR_THRESH:
			COUNTER += 1

		else:
			if COUNTER >= EYE_AR_CONSEC_FRAMES:
				TOTAL += 1

			COUNTER = 0

		cv2.putText(frame, "Blinks: {}".format(TOTAL), (10, 30),
			cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
		cv2.putText(frame, "EAR: {:.2f}".format(ear), (300, 30),
			cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
 
	cv2.imshow("Frame", frame)
	key = cv2.waitKey(1) & 0xFF
 
	if key == ord("q"):
		break

cv2.destroyAllWindows()
vs.stop()