what does this error message means?
hello. Im trying to make a face detection from live video feed using haar cascade by using this code:
import cv2 import sys
faceCascade = cv2.CascadeClassifier('/home/pi/opencv-3.1.0/data/haarcascades/haarcascade_frontalface_default.xml')
video_capture = cv2.VideoCapture(0)
while True: ret, frame = video_capture.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
faces = faceCascade.detectMultiScale(
gray,
scaleFactor=1.1,
minNeighbors=5,
minSize=(30, 30),
flags=cv2.CASCADE_SCALE_IMAGE
)
for (x, y, w, h) in faces:
cv2.rectangle(frame, (x, y), (x+w, y+h), (0, 255, 0), 2)
cv2.imshow('Video', frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
video_capture.release() cv2.destroyAllWindows()
but then I got this error message
Traceback (most recent call last): File "/home/pi/pythonpy/videofacedet.py", line 17, in <module> gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) error: /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp:8000: error: (-215) scn == 3 || scn == 4 in function cvtColor
what does that mean? and how can I fix this? I have tried to look for answer in the internet, but none works. Im new to python programming, so please be nice to me :)