I'm currently in Ubuntu 14.04, using python 2.7 and cv2.
When I run this code:
import numpy as np
import cv2
img = cv2.imread('2015-05-27-191152.jpg',0)
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
File "face_detection.py", line 11, in <module>
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
cv2.error: /home/arthurckl/Desktop/opencv-3.0.0-rc1/modules/imgproc/src/color.cpp:7564: error: (-215) scn == 3 || scn == 4 in function cvtColor
Give the full path of image with forward slash. It solved the error for me.
E.g.
import numpy as np
import cv2
img = cv2.imread('C:/Python34/images/2015-05-27-191152.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
Also, if you give 0
in second parameter while loading image using cv2.imread
than no need to convert image using cvtColor
, it is already loaded as grayscale image eg.
import numpy as np
import cv2
gray = cv2.imread('C:/Python34/images/2015-05-27-191152.jpg',0)