Opencv cv2.aruco.detectMarkers

raceback (most recent call last):
  File "/home/adminuser/venv/lib/python3.9/site-packages/streamlit/runtime/scriptrunner/", line 534, in _run_script
    exec(code, module.__dict__)
  File "/mount/src/shrim_msuering-/", line 50, in <module>
    corners, _, _ = cv2.aruco.detectMarkers(image, aruco_dict, parameters=parameters)
cv2.error: OpenCV(3.4.11) /tmp/pip-req-build-fbivvj01/opencv_contrib/modules/aruco/src/aruco.cpp:1124: error: (-215:Assertion failed) !_image.empty() in function 'detectMarkers'

link to the app is

gitreop - GitHub - Danuka97/shrim_msuering-

Hi @Danuka97,

Thanks for posting!

So it seems the error is coming from your code where you’re trying to read the file path of the uploaded file using cv2.imread( Try reading the image from the uploaded file into a format that OpenCV can work with like using byte stream then decoding it into an image like so:

if uploaded_file is not None:
    # Convert the file to an OpenCV image
    file_bytes = np.asarray(bytearray(, dtype=np.uint8)
    img = cv2.imdecode(file_bytes, 0)  # Read as grayscale
    image = cv2.imdecode(file_bytes, cv2.IMREAD_COLOR)  # Read as color image

Let me know if this resolves the issue.