Python (simple application to save images using opencv)

Question

I get this error after adding the part for saving the images, any idea how to get this error fixed ? This answer it doesn't help and it is in c++

for co in range(1, 5):
fsize = cv2.resize(roi_gray, (100, 100))

...........................................................................

errorTraceback (most recent call last)
<ipython-input-1-86e0bb6aa30e> in <module>()
     62 
     63 if __name__ == "__main__":
---> 64     create()

<ipython-input-1-86e0bb6aa30e> in create()
     21                 ret, frame = camera.read()
     22 
---> 23                 gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
     24 
     25         faces = faceCascade.detectMultiScale(

error: C:\build\2_4_winpack-bindings-win64-vc14-static\opencv\modules\imgproc\src\color.cpp:3739: error: (-215) scn == 3 || scn == 4 in function cv::cvtColor

Possible duplicate of OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cv:: cvtColor, file ..\..\..\..\opencv\modules\imgproc\src\color.cpp, line 3737 — l'L'l
– l'L'l, Commented Sep 5, 2017 at 3:50

chrisckwong821 · Accepted Answer · 2017-09-05 04:01:09Z

1

As |'L'| has said, it may be the same issue where your camera capture a gray scale image so the conversion does not work. Another possibility is youy indicate a wrong camera. The front camera for a mac is camercapture(1) while 0 for window, try change this.

answered Sep 5, 2017 at 4:01

chrisckwong821

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2 Comments

alkasm Over a year ago

"The front camera for a mac is camercapture(1) while 0 for window" --- This is not true. If you only have a single camera, it should be VideoCapture(0) regardless of the OS. I have a Macbook and my front camera is still 0. Also, the paths displayed hint at the OP using Windows anyways.

Pro Over a year ago

No it doesnot work for me, and the error came after i changed while (True): into for co in range(1, 5): and also this part fsize = cv2.resize(roi_gray, (100, 100)) cv2.imwrite('%s/%s.JPEG' % (path,count), fsize)

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