opencv by python erorr

0
votes

I got an error message when I execute the python code mentioned below:

Traceback (most recent call last):

File "C:\Users\smart-26\Desktop\예제\face.py", line 28, in

faces = face_cascade.detectMultiScale(grayframe, 1.1, 3, 0, (30, 30))

cv2.error: D:\Build\OpenCV\opencv->

3.2.0\modules\objdetect\src\cascadedetect.cpp:1681: error: (-215) !empty() in

function cv::CascadeClassifier::detectMultiScale

I don't understand this message:

error: (-215) !empty() in function cv::CascadeClassifier::detectMultiScale

Here is my code so far:

import cv2

CAM_ID = (0)

cap = cv2.VideoCapture(CAM_ID)

if cap.isOpened() == False: 
    print ('Can\'t open the CAM(%d)' % (CAM_ID))
    exit()

face_cascade = cv2.CascadeClassifier("haarcascade_frontalface_default.xml")

while(True):
   
    ret, frame = cap.read()

    grayframe = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    grayframe = cv2.equalizeHist(grayframe)

    faces = face_cascade.detectMultiScale(grayframe, 1.1, 3, 0, (30, 30))
        for (x,y,w,h) in faces:
        cv2.rectangle(frame,(x,y),(x+w,y+h),(0,255,0),3, 4, 0)
   

    cv2.imshow('Face',frame)

   
    if cv2.waitKey(10) >= 0:
        break;


cv2.namedWindow('Face')
cap.release()
cv2.destroyWindow('Face')
1
pythonopencvcascade-classifier
Look at the source code. This calls the empty method of the CascadeClassifierImpl. That hints at the classifier XML not loading correctly. | Your code lacks any kind of error checking. Both loading of the XML as well as reading frames can fail. You need to handle that. – Dan Mašek

1 Answers

0
votes

You can reference the link http://docs.opencv.org/3.0-beta/doc/tutorials/objdetect/cascade_classifier/cascade_classifier.html

Please check the cv2.CascadeClassifier return value. Make sure the haarcascade_frontalface_default.xml exist.