Extract outline from binary mask

Traces the boundary of an object in a binary mask using Moore-Neighbor chain code algorithm. Outline starts at rightmost point and traces counter-clockwise (positive/mathematical direction).

Usage

trace_outline(mask)

Arguments

mask

Logical matrix. TRUE = object, FALSE = background

Value

Matrix (n × 2) with x,y coordinates. Class c("out", "coo", "matrix", "array")

Examples

if (FALSE) { # \dontrun{
# From mask matrix
mask <- img_mask("leaf.png")
outline <- trace_outline(mask)
} # }