This function finds holes by flood filling TRUE into a 2D binary image, starting from the edge

This function finds holes by flood filling TRUE into a 2D binary image, starting from the edge

Arguments

im

A boolean matrix representing a binary image

nedges

An integer specifying how many starting points along the edge to use for filling TRUE. The starts are northwest (1), southwest (2), southeast (3), and northeast (4). The compute time increases with the number of starts.

Value

A matrix of the same size as im containing the number of neighboring pixels

Details

This is an internal function used by geom_outline to clean up outlines

Author

Michael Hallquist