我尝试运行此代码时正在运行人脸检测py文件，使用python3.7无法正常运行im

Question

我试图运行代码，但使用OPENCV2和PYTHON 3.7不能正常运行，请检查此内容。提前感谢

import cv2
import numpy as np

recognizer = cv2.face.LBPHFaceRecognizer_create()
recognizer.read("trainer/trainer.yml")
cascadePath = "haarcascade_frontalface_default.xml"
faceCascade = cv2.CascadeClassifier(cascadePath);


cam = cv2.VideoCapture(0)
fontFace = cv2.FONT_HERSHEY_SIMPLEX
fontScale = 1
fontColor = (255, 255, 255)
while True:
    ret, im =cam.read()
    gray=cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
    faces=faceCascade.detectMultiScale(gray, 1.2,5)
    for(x,y,w,h) in faces:
        cv2.rectangle(im,(x,y),(x+w,y+h),(225,0,0),2)

        Id, conf = recognizer.predict(gray[y:y+h,x:x+w])
        if(conf<50):
            if(Id==1):
                Id="chandra"
            elif(Id==2):
                Id="vamsi"

        else:
            Id="Unknown"
        cv2.putText(im,str(Id), (x,y+h),fontFace, 255)
    cv2.imshow('im',im) 
    if (cv2.waitKey(10) == ord('q')):
        break
cam.release()
cv2.destroyAllWindows()

此错误（-215：声明失败）！empty（）在函数'cv :: CascadeClassifier :: detectMultiScale'中

Answer 1

也许这会有所帮助：

try:
    ret, im =cam.read()
except:
    continue