Why Am I Getting the \"error: (-215) !empty() in function detectMultiScale\" Error When Using OpenCV\'s CascadeClassifier?

Resolving the "error: (-215) !empty() in function detectMultiScale" Issue

The error "error: (-215) !empty() in function detectMultiScale" encountered during face detection using OpenCV's CascadeClassifier typically indicates an issue with loading the pre-trained XML files that define face and eye patterns.

To address this issue, ensure that the CascadeClassifier is initialized correctly by specifying the appropriate path to the XML file. Instead of hard-coding the path, it is recommended to use the built-in cv2.data.haarcascades property, which contains the default path to these XML files.

Solution:

Modify the code to use the cv2.data.haarcascades property:

<code class="python">face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_eye.xml')</code>

This modification ensures that the CascadeClassifier is loaded with the correct XML files without the need to specify the exact path manually. By utilizing the built-in property, the code becomes more portable and eliminates the potential for path-related errors.

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