今日总结-dlib实现人脸关键点识别并进行专注度时间计算

 人脸关键点识别及专注度监测分析效果如上:

代码如下:

from scipy.spatial import distance as dist
from imutils import face_utils
import imutils
import dlib
import cv2
import time
time_start = time.time()
def eye_aspect_ratio(eye):
    # 垂直眼标志(X,Y)坐标
    A = dist.euclidean(eye[1], eye[5])  # 计算两个集合之间的欧式距离
    B = dist.euclidean(eye[2], eye[4])
    # 计算水平之间的欧几里得距离
    # 水平眼标志(X,Y)坐标
    C = dist.euclidean(eye[0], eye[3])
    # 眼睛长宽比的计算
    ear = (A + B) / (2.0 * C)
    # 返回眼睛的长宽比
    return ear


# 定义两个常数
# 眼睛长宽比
# 闪烁阈值
EYE_AR_THRESH = 0.2
EYE_AR_CONSEC_FRAMES = 3
# 初始化帧计数器和眨眼总数
COUNTER = 0
TOTAL = 0
time_sum=0
num1=0
num2=0
time_sum1=0
# 初始化DLIB的人脸检测器(HOG),然后创建面部标志物预测
print("[INFO] loading facial landmark predictor...")
# 第一步:使用dlib.get_frontal_face_detector() 获得脸部位置检测器
detector = dlib.get_frontal_face_detector()
# 第二步:使用dlib.shape_predictor获得脸部特征位置检测器
predictor = dlib.shape_predictor(
    'D:/myworkspace/fatigue_detecting-master/fatigue_detecting-master/model/shape_predictor_68_face_landmarks.dat')

# 第三步:分别获取左右眼面部标志的索引
(lStart, lEnd) = face_utils.FACIAL_LANDMARKS_IDXS["left_eye"]
(rStart, rEnd) = face_utils.FACIAL_LANDMARKS_IDXS["right_eye"]

# 第四步:打开cv2 本地摄像头
cap = cv2.VideoCapture(0)

# 从视频流循环帧
while True:
    # 第五步:进行循环,读取图片,并对图片做维度扩大,并进灰度化
    ret, frame = cap.read()
    frame = imutils.resize(frame, width=720)
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    # 第六步:使用detector(gray, 0) 进行脸部位置检测
    rects = detector(gray, 0)
    num2 = len(rects)
    num1 += 1
    if (num2 ==0):
        TOTAL += 1
    # 第七步:循环脸部位置信息,使用predictor(gray, rect)获得脸部特征位置的信息
    for rect in rects:
        shape = predictor(gray, rect)

        # 第八步:将脸部特征信息转换为数组array的格式
        shape = face_utils.shape_to_np(shape)

        # 第九步:提取左眼和右眼坐标
        leftEye = shape[lStart:lEnd]
        rightEye = shape[rStart:rEnd]

        # 第十步:构造函数计算左右眼的EAR值,使用平均值作为最终的EAR
        leftEAR = eye_aspect_ratio(leftEye)
        rightEAR = eye_aspect_ratio(rightEye)
        ear = (leftEAR + rightEAR) / 2.0

        # 第十一步:使用cv2.convexHull获得凸包位置,使用drawContours画出轮廓位置进行画图操作
        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)

        # 第十二步:进行画图操作,用矩形框标注人脸
        left = rect.left()
        top = rect.top()
        right = rect.right()
        bottom = rect.bottom()
        cv2.rectangle(frame, (left, top), (right, bottom), (0, 255, 0), 3)

        '''
            分别计算左眼和右眼的评分求平均作为最终的评分,如果小于阈值,则加1,如果连续3次都小于阈值,则表示进行了一次眨眼活动
        '''

        # 第十三步:循环,满足条件的,眨眼次数+1
        if ear < EYE_AR_THRESH:  # 眼睛长宽比:0.2
            COUNTER += 1

        else:
            # 如果连续3次都小于阈值,则表示进行了一次眨眼活动
            if COUNTER >= EYE_AR_CONSEC_FRAMES:  # 阈值:3
                TOTAL += 5
            # 重置眼帧计数器
            COUNTER = 0

        # 第十四步:进行画图操作,68个特征点标识
        for (x, y) in shape:
            cv2.circle(frame, (x, y), 1, (0, 0, 255), -1)

        # 第十五步:进行画图操作,同时使用cv2.putText将眨眼次数进行显示
        cv2.putText(frame, "Faces: {}".format(len(rects)), (10, 30), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
        cv2.putText(frame, "Blinks: {}".format(TOTAL), (150, 30), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
        cv2.putText(frame, "COUNTER: {}".format(COUNTER), (300, 30), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
        cv2.putText(frame, "EAR: {:.2f}".format(ear), (450, 30), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
        cv2.putText(frame, "Total time:" + str(int(time_sum))+"s", (10, 90), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
        cv2.putText(frame,"Focus on time:"+str(int(time_sum1))+"s" , (10,60), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
        print('眼睛实时长宽比:{:.2f} '.format(ear))
    time_sum1=time_sum*(num1-TOTAL)/num1
    print(num2)
    num2 = 0
    cv2.imshow("Frame", frame)
    time_end = time.time()
    time_sum = time_end - time_start
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
# 释放摄像头 release camera
cap.release()
# do a bit of cleanup
cv2.destroyAllWindows()

 

posted @ 2023-04-18 23:44  小彭先森  阅读(205)  评论(0编辑  收藏  举报