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I thank you again ... but I want you to notice something , look at the image below .

I thank you again ... but I want you to notice something , look at the image below .

image description

as you see in red I reported the three cards you have correctly found .... in yellow card that will probably be detected .... in fact its contour.area will be a few units smaller than the others .

The differences are too few to be decisive . I have the same problem with my code .... your code , however, is better and gives at least 5 times fewer false positives of my ....