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Barrier tape detection

Hello everyone,

What is the fastest method to detect a barrier tape ?

Here is an example picture :

Currently I'm using two color filters (black and yellow) then add these two pictures and finally try to find a line in the image using HoughLines, this sometimes works but also fails regularly, specially when one of the black or yellow parts is not passed through the color filter. This method also fails when there are two barrier tapes in a picture.

I don't want to go for learning methods because I think there must be something easier, what do you guys suggest ?

Thanks in advance