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faces = face_cascade.detectMultiScale(gray, 1.3, 5)

asked 2017-07-15 19:28:04 -0500

henrique lobato gravatar image

About the code below:

import cv2

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_alt.xml')

img = cv2.imread('2.jpg')

gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
faces = face_cascade.detectMultiScale(gray, 1.3, 5)

Im getting the following error

Traceback (most recent call last):
File "C:\Users\henri\.p2\pool\plugins\org.python.pydev_5.8.0.201706061859\pysrc\", line 1557, in <module>
cv2.error: C:\projects\opencv-python\opencv\modules\objdetect\src\cascadedetect.cpp:1681: error: (-215) !empty() in function cv::CascadeClassifier::detectMultiScale

Things I tried without success:

  • The whole path in the xml file im using
  • Put explicit parameters like img=something

Obs: The dtype of variable gray its already uint8

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answered 2017-07-16 00:35:59 -0500

berak gravatar image

you're trying to load a cascade file here:

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_alt.xml')

but that failed, it did not find it. (it's not the image ..)

either copy that to where you run the script, or use an absolute path for the cascade.

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Here is how the problem was solved

I dont know why windows did not recognized the .xml file at first, so I changed for the xml file from the opencv-master folder

It worked. Thanks for the answer berak

henrique lobato gravatar imagehenrique lobato ( 2017-07-16 11:24:31 -0500 )edit
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Asked: 2017-07-15 19:28:04 -0500

Seen: 2,108 times

Last updated: Jul 16 '17