cv2.error: D:\Build\OpenCV\opencv-3.3.1\modules\imgproc\src\color.cpp:11016: error: (-215) scn == 3 || scn == 4 in function cv::cvtColor

[Rhaegal]

When I use your code,I find there is a error
First,I modified ['-src', '--source', dest='video_source', type=int,……]
to ['-src', '--source', dest='video_source', type=str,……]
Then I use this command "python object_detection_multithreading.py -src E:C.mp4",but the mistake appeared.
E:\test_opencv\object_detector_app-master_PB>python object_detection_multithreading.py -src E:C.mp4
warning: Error opening file (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:808)
warning: E:C.mp4 (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:809)
[INFO] elapsed time: 0.00
[INFO] elapsed time: 0.00
[INFO] elapsed time: 0.00
[INFO] elapsed time: 0.00
[INFO] elapsed time: 0.00

OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cv::cvtColor, file D:\Build\OpenCV\opencv-3.3.1\modules\imgproc\src\color.cpp, line 11016
Exception in thread Thread-1:
Traceback (most recent call last):
File "E:\Anaconda3\lib\threading.py", line 914, in _bootstrap_inner
self.run()
File "E:\Anaconda3\lib\threading.py", line 862, in run
self._target(*self._args, **self._kwargs)
File "object_detection_multithreading.py", line 77, in worker
frame_rgb = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR)
cv2.error: D:\Build\OpenCV\opencv-3.3.1\modules\imgproc\src\color.cpp:11016: error: (-215) scn == 3 || scn == 4 in function cv::cvtColor

How to fix it?

[QianyuanLiu]

May you modify your path of the file.

[Thu_aki]

Maybe your computer can not connect to camera by python.
You should check your python code if it could access your camera first.
Best, Thu

[QJXX]

I alse have the problem:anyone can help me?
OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.3.0/modules/imgproc/src/color.cpp, line 10638
Traceback (most recent call last):
File "faceDetection.py", line 21, in
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
cv2.error: /home/pi/opencv-3.3.0/modules/imgproc/src/color.cpp:10638: error: (-215) scn == 3 || scn == 4 in function cvtColor

[Basha]

import cv2
import sys

cascPath = "/haarcascades/haarcascade_frontalface_default.xml"
faceCascade = cv2.CascadeClassifier(cascPath)

video_capture = cv2.VideoCapture(0)

while True:
# Capture frame-by-frame
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.cv.CV_HAAR_SCALE_IMAGE
)

# Draw a rectangle around the faces
for (x, y, w, h) in faces:
    cv2.rectangle(frame, (x, y), (x+w, y+h), (0, 255, 0), 2)

# Display the resulting frame
cv2.imshow('Video', frame)

if cv2.waitKey(1) & 0xFF == ord('q'):
    break

When everything is done, release the capture

video_capture.release()
cv2.destroyAllWindows()

---

after running above code getting below error : Request to any one to help in this

File "C:/Users/Ahil Rayyan/Desktop/Face Recog Project/07_Nov_2018_V0.1/Video testing.py", line 13, in
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

error: OpenCV(3.4.1) C:\Miniconda3\conda-bld\opencv-suite_1533128839831\work\modules\imgproc\src\color.cpp:11147: error: (-215) scn == 3 || scn == 4 in function cv::cvtColor

[Karamnuy]

i also encountered the error when i tred to show my images in my computer ,the code is as follows:

import cv2
import matplotlib.pyplot as plt
extractdir = r'F:/Python exercise/Machine Learning for OpenC/pedestrians128x64'
for i in range(5):
filename = '%s/per0001%d.pmm' % (extractdir, i)
img = cv2.imread(filename)
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
plt.subplot(1, 5, i+1 )
plt.imshow(img)
# img_rgb = cv2.cvtColor(img_bgr, cv2.COLOR_BGR2RGB)
plt.axis('off')

the result : cv2.error: C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:10606: error: (-215) scn == 3 || scn == 4 in function cv::cvtColor

what can i do to fix it

[varu1234]

MR QJXX, I also face the same problem. tell me solution if that is you know

[Yonghua Wang]

MR QJXX, I also face the same problem. tell me solution if that is you know, please

[wuttisakpo]

OpenCV(3.4.1) Error: Assertion failed ((scn == 3 || scn == 4) && (depth == 0 || depth == 5)) in cv::cvtColor, file C:\Miniconda3\conda-bld\opencv-suite_1533128839831\work\modules\imgproc\src\color.cpp, line 11214
Traceback (most recent call last)