For instance a value of 2 means that the border will have a width equivalent to the size of two internal bits.
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If you send someone that file, that person will connect back to your computer.
Instead, a marker id is simply the marker index within the dictionary it belongs to.
A minMarkerPerimeterRate value of 0 and a maxMarkerPerimeterRate value of 4 or more will be equivalent to consider all the contours in the image, however this is not recommended for performance reasons.
We could spend quite some time giving you recommendations.