Decode punched tape from image

Is there a library that could help decode the punched tape from an image? Punched tape is like this:

The dots have different color than background. The image is just a white rectangle with black dots. I need to locate the dots and then decode the text. The desired output is for example an array ("00011", "11001", ...) where 1 is the dot, 0 is the missing dot.

What approach would you recommend? I would prefer something easy to use like python's PIL or ImageMagick or something in ruby.

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