Add more error handling for OpenCV #11
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If imread from the opencv library can't read a file for any reason, it returns None, but we're not checking that so you instead get a confusing AttributeError later on. Since there's no point in continuing without image data, this raises a clear exception.
If confidence happens to be passed as a string instead of a float, there's problems later during comparision and an exception happens. Confidence should always be a float, so this forces it.
asweigart
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Jun 3, 2015
Add more error handling for OpenCV
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