Fixing Assertion Failed Error in Python OpenCV

Understanding the Error Message

OpenCV(4.2.0) /Users/travis/build/skvark/opencv-python/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

The error message you are seeing is indicating that there is an assertion failure in the cvtColor function of the imgproc module of OpenCV. The assertion failure specifically checks whether the source image is empty or not. This means that there is likely a problem with the input image that you are trying to process.

How to Fix the Error

To fix this error, you should first check whether the input image you are trying to process actually exists and is not empty. You can do this by checking the path of the image file you are trying to load, or by checking whether the numpy array containing the image data has any values.

If the input image is indeed empty, you will need to provide a valid image for the function to process. If the input image exists and is not empty, you may need to check whether it is in the correct format for the function, or if there are any other issues with the image data.

If you are still unable to resolve the error, you may want to try updating your version of OpenCV or reinstalling it to ensure that you have the latest version with all necessary dependencies installed. Additionally, you can search online for similar error messages to see if there are any known issues or solutions that can help you fix the problem.

How can you identify if the input image is empty in Python OpenCV?

You can identify if the input image is empty in Python OpenCV by checking the path of the image file you are trying to load or by verifying whether the numpy array containing the image data has any values.