i have the same problem

This a secondary error that basically just means the image you are trying to process didn't load and was empty.

If you grabbed the image dara from the camera, it means the camera connection failed or isn't configured correctly. If you loaded an image file, it means the loading failed.

I was facing this issue and by removing special characters from the image_file_name the issue was resolved.

Example: Renaming "48172454-thymianblätter.jpg" to "48172454-thymian.jpg".

I am using hik vision's camera and i am getting same error...i think my laptop's processor is not able to load the frames due to very high resolution and frame rate

I am having the same issue. Is image resolution causing the problem?

I have same problem. My old code is : cap = cv2.VideoCapture(1)

Then I change my code, and problem has solved. Probably, opencv accepts my finger print input as a camera. Thus, I change VideoCapture parameter as follows:
cap = cv2.VideoCapture(0)

how to solve this error. anyone has answer for this error: OpenCV(4.1.0) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

this problem occcurs when you dont declare what 'im' is or the image has not been loaded to the variable 'im'/.
if you're using your webcam to capture then use
cap = cv2.VideoCapture(-1) on linux
cap = cv2.VideoCapture(0) on windows
and 'im' must be ret, im = cap.read().
So it will read the image properly.
if you do follow these steps the error must not occur.

Now I guess we can close this issue. @ageitgey @rezabrg @rafaelpsimoes

@rezabrg download the required haarcascades it will work
https://github.com/opencv/opencv/tree/master/data/haarcascades

In my case, I found that in the settings of windows 10, permission to access camera has been disabled to any applications

I am using hik vision's camera and i am getting same error...i think my laptop's processor is not able to load the frames due to very high resolution and frame rate

Did you find a solution?

cv2.error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor' how to solve this

gray = cv2.cvtColor(image_frame, cv2.COLOR_BGR2GRAY)

error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

mn biết lỗi này là sao k ạ

The same is happening with me

I realized I wasn't in the same dir as the image.I was trying to load an image from Desktop using just the image name.jpg. I changed dir into Desktop and everything worked fine.

I am facing the same issue? what is causing the problem?

I have the same problem the reason was the image name in the folder was different from the one i was calling from cv2.imread function. properly load the images. hope it helps

Having the same error... Please help out!!

error -

If you use a camera:
cv2.VideoCapture(0) #win
cv2.VideoCapture(-1) #linux
If you play local video:
cv2.VideoCapture("videoFilePath")

Same error

Traceback (most recent call last):
File "basic/imageread.py", line 5, in
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
cv2.error: OpenCV(4.2.0) /io/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

complete image path helps me to resolve error
example : cv2.imread("C:\Users\xyz\Desktop\Python\welcome.png")

ret, frame = cv2.VideoCapture('PATH').read()
You should put :
'''
if ret == False
break
'''
above:
'''
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('gray', gray)
'''
Because when it comes to the final frame of the video, then there will be no frame for
'''
cv2.cvtCOLOR(frame, cv2.COLOR_BGR2GRAY)
''''
_src.empty() in function 'cv::cvtColor' means that is no source for the function.

cv2.error: OpenCV(4.2.0) /io/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

Same here, the suggestions under this topic didnt work for me.

gray = cv2.cvtColor(image_frame, cv2.COLOR_BGR2GRAY)

error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

mn biết lỗi này là sao k ạ

chuyển \ thành / thử xem bạn

cv2.error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor' how to solve this

How to solve?

error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\objdetect\src\cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'

Please help!

The problem is your image location. Just check carefully if you make a mistake on the location. For example if your image stored under a folder and rather in the same folder of your source code then dont use color = cv2.imread("butterfly.jpg", 1 ) instead color = cv2.imread("images/your-folder/butterfly.jpg", 1 )