Real time face detection OpenCV Python

Question

I am trying to make a basic program for a real time face detection  Here s my code  I am a newbie in OpenCV     import numpy as np import cv2 cam   cv2 VideoCapture 0  name    detect  face cascade   cv2 CascadeClassifier  haarcascade frontalface default xml   cv2 namedWindow name  cv2 WINDOW AUTOSIZE  while True      s  img   cam read       gray   cv2 cvtColor img  cv2 COLOR BGR2GRAY      faces   face cascade detectMultiScale gray  1 3  5       print s     for  x y w h  in faces          img   cv2 rectangle img  x y   x w y h   255 0 0  2      cv2 imshow name  img          k   cv2 waitKey 0      if k    27          cv2 destroyWindow  Detect           break   But when I run this code I get this error    OpenCV Error  Bad flag  parameter or structure field   Unrecognized or unsupported array type  in cvGetMat  file  build buildd opencv-2 4 2 dfsg modules core src array cpp  line   2482 Traceback  most recent call last   File  mytry py   line 27  in  lt module gt  cv2 imshow name  img      cv2 error   build buildd opencv-2 4 2 dfsg modules core src array cpp 2482  error   -206  Unrecognized or unsupported array type in function cvGetMat   I am a newbie in OpenCV   Please tell me what is wrong with the code  why does this error arises what changes should I make

User · Accepted Answer

Your line   img   cv2 rectangle img  x y   x w y h   255 0 0  2    will draw a rectangle in the image  but the return value will be None  so img changes to None and cannot be drawn   Try  cv2 rectangle img  x y   x w y h   255 0 0  2

[python] Real time face detection OpenCV, Python

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