You have a 2D list, means, numpy_array[1] is not a string but a list, and inside that list there is a string, so use numpy_array[1, 0], to get the string inside it, or remove the extra dimension using numpy.squeeze(numpy_array), then using numpy_array[1] will work.
cv.imread(numpy_array[1, 0])
or
numpy_array = numpy.squeeze(numpy_array)
cv.imread(numpy_array[1])
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