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you're using the wrong tutorial for your opencv version.for latest, have a look here

opencv4 does no more return the image from there, so there are only 2 return values now.

you're using the wrong tutorial for your opencv version.for latest, have a look here , for 3.4 or older here

opencv4 does no more return the image from there, so there are only 2 return values now.now, while older versions had 3 return values there.