dlib库 眨眼

import cv2
import cv2 as cv
import dlib
import imutils
from imutils import face_utils
from scipy.spatial import distance as dist


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])
    return (a + b) / (2.0 * c)


EYE_AR_THRESH = 0.3
EYE_AR_frameS = 3
COUNTER = 0
TOTAL = 0

detector = dlib.get_frontal_face_detector()
predictor = dlib.shape_predictor('./1.dat')
(lStart, lEnd) = face_utils.FACIAL_LANDMARKS_IDXS["left_eye"]
(rStart, rEnd) = face_utils.FACIAL_LANDMARKS_IDXS["right_eye"]
cap = cv.VideoCapture(0, cv.CAP_DSHOW)

while True:
    ret, frame = cap.read()
    frame = imutils.resize(frame, width=450)  # 设置宽度  ·450
    gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
    rs = detector(gray, 0)

    for rect in rs:
        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_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)
    if cv2.waitKey(1) & 0xFF == 27:
        break

cv2.destroyAllWindows()
cap.release()