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Why knows if the contour passed on line?

Hello there! I like to count the number of peoples or cars. I make a line on center of image. Ex.: image description But, how can I know that he has passed and not cont again while the contour be on the line? The contours has a ID?

Why knows if the contour passed on line?

Hello there! I like to count the number of peoples or cars. I make a line on center of image. Ex.: image description

But, how can I know that he has passed and not cont again while the contour be on the line? The contours has a ID?

Why How knows if the contour passed on line?

Hello there! I like to count the number of peoples or cars. I make a line on center of image. Ex.: image description

But, how can I know that he has passed and not cont again while the contour be on the line? The contours has a ID?